Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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De extreme zomer van 2006. Langetermijngevolgen van klimaatverandering
Nabuurs, G.J. ; Orden, W.H. van; Bijlsma, R.J. ; Sass-Klaassen, U. ; Ouden, J. den - \ 2007
Vakblad Natuur Bos Landschap 4 (2007)8. - ISSN 1572-7610 - p. 23 - 23.
houtteelt - houtaanwas - diameter - monitoring - klimaat - silviculture - increment - climate
Om meer inzicht te verkrijgen in zowel korte- als langetermijngevolgen en aanpassingsvermogen van bomen is in 2006 in vijf bosreservaten gestart met een nieuwe methode van langdurige monitoring van diktegroei van bomen. Op dit moment zijn het aantal dendrometers uitgebreid met 100 te verdelen over 22 bosreservaten
Verhoogde bijgroei, oorzaken en gevolgen; verslag van de International seminar on Causes and Consequences of accelerating tree growth in Europe 17-19 May 1998 in Nancy, Frankrijk
Daamen, W.P. ; Nabuurs, G.J. ; Oosterbaan, A. - \ 1999
Nederlands Bosbouwtijdschrift 71 (1999)1. - ISSN 0028-2057 - p. 13 - 16.
bosbouw - bossen - groei - houtaanwas - biomassa - opstandsontwikkeling - opstandsstructuur - milieufactoren - europa - forestry - forests - growth - increment - biomass - stand development - stand structure - environmental factors - europe
Dood hout in de bosreservaten
Hees, A.F.M. van; Clerkx, A.P.P.M. - \ 1999
De Levende Natuur 100 (1999)5. - ISSN 0024-1520 - p. 168 - 172.
dode bomen - dood hout - verrot hout - verval - decompositie - bossen - bosbouw - bosbedrijfsvoering - bosstatistieken - beschermde bossen - houtaanwas - opstandsstructuur - opstandsontwikkeling - biomassa - dead trees - dead wood - decayed wood - decay - decomposition - forests - forestry - forest management - forest statistics - reserved forests - increment - stand structure - stand development - biomass
Overzicht van de hoeveelheid dood hout, de sterfte van bomen en de verteringssnelheid van deze bomen in enkele niet meer beheerde Nederlandse bosreservaten. Voor drie typen bos (gemengd bos; grove den; zomereik) is op grond van een beheerscenario de te verwachten hoeveelheid hout in de loop van de tijd berekend
Simulation of growth and competition in mixed stands of Douglas-fir and beech
Bartelink, H.H. - \ 1998
Agricultural University. Promotor(en): J. Goudriaan; A. van Maaren; Frits Mohren. - S.l. : Bartelink - ISBN 9789054858348 - 222
bosbouw - gemengde bossen - groeimodellen - houtaanwas - voorspellen - plantensuccessie - periodiciteit - vegetatie - bomen - computersimulatie - simulatie - simulatiemodellen - pseudotsuga menziesii - fagus sylvatica - gemengde opstanden - forestry - mixed forests - growth models - increment - forecasting - plant succession - periodicity - vegetation - trees - computer simulation - simulation - simulation models - mixed stands
<p>For a long time, the emphasis in silviculture in Western Europe was solely on even-aged, monospecific stands; many empirical stand-level growth models were developed and successfully used for managing such stands. In contrast, no generally accepted growth and yield approach has emerged so far for mixed forests. Moreover, the inexhaustible number of species combinations, management regimes, and site-dependent interactions make an empirical approach less suitable.</p><p>In the present study, a mechanistic model was developed that simulates growth and yield in mixed forest stands. Douglas-fir ( <em>Pseudotsuga menziesii</em> (Mirb.) Franco) and beech ( <em>Fagus sylvatica</em> L.) were used in this research. In the model, tree growth is dependent on radiation availability. Stand development is largely driven by competition for radiation. A spatial module was developed to investigate the effects of tree and stand characteristics on radiation interception. The study showed that in heterogeneous stands a spatial approach is needed to account for competition between trees.</p><p>Growth of the trees was estimated using the radiation-use efficiency concept (RUE). Results revealed that detailed process models can be used to estimate RUE and that it is a suitable tool for (mixed) forest modelling.</p><p>To describe the distribution of the dry matter growth, a separate module was developed using functional relationships between tree components: the dry matter distribution is driven by the aim to maintain structural balances within the tree. The study showed that this approach is able to reproduce the development of an individual forest tree. The approach was thus considered very suitable for modelling the effects of between-tree competition for resources on growth and development of mixed forest stands.</p><p>The overall growth model, COMMIX, was applied to investigate the effects of stand composition on mixed stand productivity, using a replacement series. Analysis showed that the productivity of mixed forest stands is generally somewhere in between the yield levels of the monocultures of the less productive and the most productive species. It will only be possible to achieve higher yields in mixed stands if these stands have a relatively small proportion of the sub-dominant species. In the case of Douglas-fir and beech, the maintenance of a mixed stand appeared to conflict with the maximization of the wood production.</p><p>Insufficient data are available on mixed stands to directly support decision taking in forest management. New research tools capable of providing forest managers with information on possible management scenarios and on the consequences of certain management regimes are therefore urgently required. The present modelling approach is part of an ongoing development of models for mixed stands. The infinite variety of possible species mixtures coupled with the range of environmental conditions under which mixtures might be grown, necessitates a mechanistic approach and emphasises the potential use of such models.</p>
HOPSY: instrument voor afwegen van beheersalternatieven
Edelenbosch, N.H. - \ 1997
Bosbouwvoorlichting 36 (1997)7. - ISSN 0166-8986 - p. 119 - 122.
bosbouw - opbrengsten - theorie - houtaanwas - staande opstand - bossen - rotaties - aanbodsevenwicht - vraag - aanbod - econometrische modellen - wiskundige modellen - bosbedrijfsvoering - opbrengstregeling - velling - bosexploitatie - forestry - yields - theory - increment - growing stock - forests - rotations - supply balance - demand - supply - econometric models - mathematical models - forest management - yield regulation - felling - forest exploitation
Prognoses ontwikkeling houtoogst met Hopsy. Het houtoogstprognose-systeem Hopsy is een instrument dat consequenties voor strategische beheerskeuzen voor de toekomstige houtoogst en houtvoorraad laat zien
Onderzoek naar de groei van tamme kastanje (Castanea sativa) in Nederland
Oosterbaan, A. - \ 1996
Bosbouwvoorlichting 35 (1996)2. - ISSN 0166-8986 - p. 18 - 18.
biomassa - milieufactoren - bosbouw - bosbouwkundige handelingen - groei - houtaanwas - nederland - houtteelt - opstandsontwikkeling - opstandsstructuur - bomen - castanea sativa - biomass - environmental factors - forestry - forestry practices - growth - increment - netherlands - silviculture - stand development - stand structure - trees
Samenvatting van IBN-rapport 197
Tussentijdse evaluatie van de opnamemethode van het SILVI-STAR monitoringsysteem
Os, L.J. van - \ 1994
Wageningen : IBN (IBN - rapport 064) - 13
bosbouw - plantenecologie - bomen - autecologie - habitus - levensvorm - plantenontwikkeling - groeimodellen - houtaanwas - voorspellen - synecologie - meting - experimenten - statistiek - simulatie - modellen - onderzoek - opstandsstructuur - opstandsontwikkeling - forestry - plant ecology - trees - autecology - habit - life form - plant development - growth models - increment - forecasting - synecology - measurement - experiments - statistics - simulation - models - research - stand structure - stand development
Simulatie van de potentiele groei van Populus Robusta
Salm, C. van der - \ 1993
Wageningen : DLO-Staring Centrum (Rapport / DLO - Staring Centrum 242) - 55
voorspellen - bosbouw - groeimodellen - houtaanwas - bomen - populus canadensis - forecasting - forestry - growth models - increment - trees
Pinogram : a pine growth area model
Leersnijder, R.P. - \ 1992
Agricultural University. Promotor(en): R.A.A. Oldeman. - S.l. : s.n. - 164
bosbouw - bomen - computersimulatie - simulatie - simulatiemodellen - groeimodellen - houtaanwas - voorspellen - opstandsontwikkeling - opstandsstructuur - biomassa - pinus sylvestris - forestry - trees - computer simulation - simulation - simulation models - growth models - increment - forecasting - stand development - stand structure - biomass - cum laude
<p>Ideas about forest and forestry in the Netherlands have changed in recent years, partly because nature and recreation are in greater demand, partly because of growing environmental problems (air pollution, global warming) and partly because of the decrease in forest area worldwide. This has led to a change in the government's forest policy (Anonymus 1985, 1986, 1990). Ile current aim is to achieve a more natural-looking forest (uneven aged, mixed, native species) and to have forest management linked to natural processes and which, while cheaper, has more benefits.<p>As a result of this shift in policy, forestry is expected to change significantly. In the first place, silvicultural practices in Dutch forests will be aimed at achieving a more continuous forest. Clear-cutting and large plantations will be replaced by silvicultural systems in which the cutting and regeneration processes are extended over several decades and in which mixing of species plays an important role. The management of such uneven-aged and mixed forests will have to be based much more on knowledge of the behaviour of the individual tree and its *interaction with the biotic and abiotic environment than is currently the case in even-aged and pure forests.<p>To be able to achieve the desired changes in composition, functions and management of the Dutch forests successfully, it will be necessary to make use of the natural dynamics and developmental processes of forests. However, our current knowledge of these is certainly not complete, or is not appropriate to the Dutch *situations or has not yet been translated in silvicultural strategy. There is a clear need to find out more about forest dynamics under specific Dutch circumstances.<p>Forest dynamics may be studied with the help of the *autoecology and *synecology of the different forest components. Because trees are the main components establishing forest architecture, it seems rational to start by investigating the autoecology and synecology of trees. The research presented here was directed at the Scots pine ( <em>Pinus sylvestris</em> L.), the most common tree species in the Netherlands. It aimed at developing silvicultural information diagrams for Scots pine for different sites, provenances and treatment (tree and stand history). Silvicultural information diagrams should give information on characteristics such as *tree architecture, crown form and -dimensions, stem form, stem diameter and stem volume, and the likelihood of flowering and fructification, disease and damage and their consequences.<p>In principle an infinite number of silvicultural information diagrams is possible; therefore, it is necessary to determine the influence of age, site, provenance and treatment on the *phenotype of a tree to fulfil the above aim. If these relations are known, the above aim can be achieved by developing an interactive model, in which the user can input age, site, provenance and treatment. Because the model should be dependent upon tree history and age, it was decided to develop a *growth model.<p>Growth models may be classified according to the hierarchical levels of their output; for instance the levels "organ", "organism", "*eco-unit" and silvatic-mosaic as defined by Oldeman (1990). Growth models rarely involve more than two levels. Growth may be understood as a process which is steered by growth factors inherent in a certain starting *situation and driving it towards a new situation over time. The starting situation may be understood as a *system of a certain hierarchical level, built up from subsystems of a lower hierarchical level. Growth models on a level between "organ" and "organism" have been developed by Aono and Kunii (1984), De Reffye et al. (1989) and others. Models such as those in the "JABOWA-family" (Botkin in West et al. 1981) mainly involve the levels "eco-unit" and "silvatic-mosaic". "Spatial models" (Hara 1988) are usually at the "organism" and "eco-unit" level.<p>As well as being classified according to the hierarchical levels mentioned, growth models may also be classified as physiological models, architectural models and mathematical models. This classification roughly indicates the method used to describe or declare the *situations or processes the model is dealing with. Physiological models are based on physiological processes; a process is described as the result of interacting underlying processes (see De Wit 1965, Borman and Likens 1979, Hari et al. 1985, Mohren 1987). Architectural models are based on the structural appearance of a *system, in which the appearance of a system (e.g. *silvatic-mosaic, *eco-unit, organism) is defined by the pattern and appearance of the subsystems (respectively eco-units, organisms, organs). Examples of these are the models developed by Aono and Kunii (1984), De Reffye et al. (1989), Koop (1989) and others. Mathematical growth models describe the changes in the appearance of a system over time and in relation to factors that probably influence these changes. Generally, correlations and not causal relations are used to find growth equations. The "spatial" and "nonspatial" models (see Hara 1988) can be classified as mathematical models.<p>Because a silvicultural information diagram should demonstrate the temporal changes of the *phenotype of a tree, the model should involve both the levels between "organism" and "eco-unit" The phenotype of a tree depends upon its "*normal growth" and also upon favourable and stress factors. "Normal growth" is defined by the genetic characteristics of a tree, by a more or less constant site quality and climate during its lifetime and by *competition for light, water and nutrients. Stress factors may be diseases and plagues, environmental pollution and damage by, for example, temporary climate extremes. Favourable factors may be fertilization, changing soil water supply, immigration of mycorrhiza, etc.<p>The model presented here has been restricted to "normal growth". Competition is understood as competition for qualified space and constraints are not defined (e.g. available light, water or nutrients). One of the most important ways of influencing tree growth is to provide more space by cutting neighbouring trees. The model does indeed show large similarities with "spatial" models.<p>The models present in the current literature are either related to another hierarchical level, or do not deal with crown growth or with the *growing space of individual trees and the architecture of the "*eco-unit" Therefore none of them are really appropriate for creating a silvicultural information diagram for the different circumstances required. This is why a new model is needed.<p>Using information from the literature and data from an old provenance trial in Kootwijk (Province of Gelderland, the Netherlands), the influence of genetic traits, site, growing space, age and phenotype on the growth of trees was studied. It was found that the height growth of trees is mainly defined by *genotype, site characteristics and climate and that *radial growth is mainly defined by height growth and growing space. It still seems impossible to precisely predict the height growth of an individual tree during its life time. But it is probably possible to forecast the mean height growth and standard deviation for a tree of a certain provenance and on certain site.<p>In order to calculate the influence of the *growing space on the radial growth of trees a field study was done, in which diameter, crown length, crown width, tree height, volume, age and *normal growth area of 158 trees divided over 13 stands were measured once. The normal growth area is defined as the area in which a tree has more competitive power than its neighbours. It is calculated with the help of the distances from the *sample tree to its neighbouring trees, the distances between the consecutive neighbours and the heights of all these trees. Non-linear regression was used to correlate crown length, mean crown width and stem diameter with tree height, age and mean *growth area vector. The resulting correlations were sufficiently good to enable growth equations to be derived.<p>A good non-linear correlation, based on 38 felled trees, was also found between form factor on the one side and tree length, crown length and diameter on the other side. In the resulting regression equation the crown length defines the form factor better than tree length does. A reasonably good non-linear correlation was also found between mean branch diameter in the lower part of the crown and tree length, crown length and mean crown width.<p>The derived growth equations were used to develop a growth simulation program, called "PINOGRAM". This program, written in "Microsoft C, visualizes the growth of individual trees in relation to the *competition they experience.<p>In the PINOGRAM program growth is simulated in a *transect of 50 * 20 metres. The user first enters the planting distance within a row and between rows. He must also enter a minimum and maximum *S value. These values are defined as respectively the minimum and maximum heights that a tree of a certain provenance on a certain site can reach at infinite age. In *homogeneous stands the minimum and maximum S value do not differ greatly, in contrast with *heterogeneous stands. The program then assigns to each tree an S value S <em><sub><font size="-2">tree</font></sub></em> according to a normal distribution and a confidence interval of 95% between minimum and maximum S values. Finally, the user must enter the age at which he wants to see the transect.<p>The program calculates the height of each tree (called: sample tree) at the given age according to the Chapman-Richards function. Using the heights of a sample tree and its neighbours and the distances between these trees, the *normal growth area vectors between the sample tree and its neighbours are calculated first. Next the extent to which the trees can use these normal growth area vectors is calculated. This depends upon the possible crown length increment in the direction of the neighbour within the given time interval and without *competition (= *potential growth area vector). The normal growth area vectors and the potential growth area vectors of the sample tree and its neighbours are used to calculate the *maximum growth area that the sample tree can occupy (= maximum growth area vector). The perpendiculars of the maximum growth area vectors include the maximum growth area. Within this maximum growth area, new *maximum growth area vectors are calculated in sixteen compass points (N, NNE, NE, ENE, E, etc.). In order to find the growth area actually occupied (= * actual growth area), the potential growth area vectors in these sixteen directions are also calculated. The *actual growth area vectors are derived from the minimum of the maximum growth area vectors and the potential growth area vectors.<p>The actual growth area vectors are used to calculate the diameter, the crown length and crown width in sixteen directions. Next, form factor, volume and mean branch diameter (in the lower part of the crown) can be computed per tree and finally also the yield data per ha and the *canopy closure are computed. Now all the necessary data for drawing a crown map, a profile diagram or a threedimensional picture of the transect are available.<p>After one *situation has been computed and the crown map has been drawn, a new age can be entered and the user can request some trees to be felled. He can choose between *manual thinning (the user points out which trees have to be removed) and *automatic thinning (the user indicates whether a low thinning or a *high thinning has to be carried out and how many m <sup><font size="-2">3</font></SUP>have to be removed. At high thinning the user can indicate the critical h/cl ratio, at which a neighbouring tree should be removed). Natural mortality of a tree occurs when the tree height divided by the mean crown width of a tree exceeds six (= mortality factor M). The trees selected to be thinned are removed and now the heights and *growth areas of the remaining trees are calculated at the new age, from which the new tree dimensions are then derived.<p>The program displays information about stem number per ha, stem distribution, crown length and crown width, crown asymmetry, canopy closure and tree height by means of a crown map, profile diagrams and three-dimensional drawings. Underneath it displays a table showing data on the tree height, stem diameter, form factor, mean branch diameter in the lower part of the crown for individual trees, plus data on stem number per ha, basal area per ha and volume per ha of the remaining stand and of thinnings. Note that growth performance according to the equations as used in the model results in a <u>mean</u> expected growth for an individual tree at a given thinning regime.<p>This growth simulating program enables the growth of individual trees within a stand to be depicted graphically. Different silvicultural systems can be applied, to study their effects on stand growth. The graphical design makes this insight very communicable and useful (for instance, for teaching). And the results can be used in further modelling (for example, in a model of stand structure and light, or of cost and benefit, or of silvicultural system and timber quality).<p>The growth equations used in the model cannot be used directly on real trees. The *normal growth area of a tree, as measured in the field, often differs from the *actual growth area the tree is using at that moment. The actual growth area can be calculated using the crown widths measured in sixteen directions, but generally the matching crown lengths and diameters calculated differ from the measured ones, because these tree dimensions are not 100% correlated with age, height and actual growth area.<p>The model has only been tested for Scots pine on the Veluwe. It does not yet give information about *tree architecture, stem form, flowering and consequences of damage, diseases, climatic changes and environmental pollution. In its present form it also cannot yet be applied to mixed and uneven-aged stands. There is scope for improvement; fruitful avenues of future research are suggested in section 5.3.
Invloed van grondwaterstandsdaling op de houtbijgroei van bos rond het pompstation Vessem
Delft, S.P.J. van - \ 1991
Wageningen : DLO-Staring Centrum (Rapport / DLO-Staring Centrum 87) - 122
grondwaterspiegel - bosbouw - bodemwater - houtaanwas - opstandsontwikkeling - grondwaterwinning - bodemkarteringen - kaarten - ecohydrologie - kempen - noord-brabant - water table - forestry - soil water - increment - stand development - groundwater extraction - soil surveys - maps - ecohydrology
HOPSY-2, een instrument voor de normatieve en strategische planning van houtoogst = HOPSY-2, a tool for strategic planning of timber harvest
Hinssen, P.J.W. - \ 1990
Wageningen : Dorschkamp (Rapport / De Dorschkamp Instituut voor Bosbouw en Groenbeheer nr. 606) - 123
econometrie - aanbodsevenwicht - vraag - aanbod - econometrische modellen - wiskundige modellen - bosbouw - opbrengsten - theorie - houtaanwas - staande opstand - bossen - rotaties - bosbedrijfsvoering - opbrengstregeling - velling - bosexploitatie - econometrics - supply balance - demand - supply - econometric models - mathematical models - forestry - yields - theory - increment - growing stock - forests - rotations - forest management - yield regulation - felling - forest exploitation
Een onderzoek naar verbanden tussen sterfte in zomereikenopstanden in Nederland en de grondwatertrap
Oosterbaan, A. ; Nabuurs, G.J. ; Maas, G.J. - \ 1990
Wageningen : De Dorschkamp (Rapport / De Dorschkamp Instituut voor Bosbouw en Groenbeheer nr. 601) - 61
bosbouw - bomen - achteruitgang, bossen - levensvatbaarheid - bodemwater - permeabiliteit - absorptie - hygroscopiciteit - waterrelaties - wortels - bodem - verzuring - bodem ph - bodemaciditeit - nederland - houtaanwas - diameter - omtrek - jaarringonderzoek m.b.v. boorspanen - bodemchemie - anorganische verbindingen - quercus robur - forestry - trees - forest decline - viability - soil water - permeability - absorption - hygroscopicity - water relations - roots - soil - acidification - soil ph - soil acidity - netherlands - increment - girth - increment boring - soil chemistry - inorganic compounds
Houtoogst uit het Nederlandse blijvende opgaande bos van 1985 tot 2035 : de prognoses in 1990 met toepassing van het houtoogstprognoseprogramma HOPSY-2 = The Dutch standing forest wood supply forecast 1990 : an application of the wood supply forecasting computer program HOPSY-2
Hinssen, P.J.W. ; Daamen, W.P. - \ 1990
Wageningen : Dorschkamp (Rapport / De Dorschkamp Instituut voor Bosbouw en Groenbeheer nr. 605) - 156
bosbouw - bosbedrijfsvoering - opbrengsten - theorie - houtaanwas - staande opstand - bossen - rotaties - opbrengstregeling - velling - markten - marketing - vraag - aanbod - hout - houtproducten - prijzen - aanbodsevenwicht - econometrische modellen - wiskundige modellen - nederland - bosexploitatie - forestry - forest management - yields - theory - increment - growing stock - forests - rotations - yield regulation - felling - markets - demand - supply - wood - wood products - prices - supply balance - econometric models - mathematical models - netherlands - forest exploitation
Bedrijfseconomische gevolgen van vitaliteitsvermindering : eerste methodiekontwikkeling voor het kwantificeren van de financiele schade door vitaliteitsvermindering op bosbedrijfsniveau
Jans, M.F.F.W. - \ 1990
Wageningen : De Dorschkamp (Rapport / De Dorschkamp, Instituut voor Bosbouw en Groenbeheer nr. 597) - 83
bosbouw - achteruitgang, bossen - levensvatbaarheid - houtaanwas - opstandsontwikkeling - opstandsstructuur - biomassa - bosbedrijfsvoering - bosbouweconomie - staande opstand - bossen - taxatie - opbrengsten - theorie - nederland - bosopstanden - boswaardebepaling - forestry - forest decline - viability - increment - stand development - stand structure - biomass - forest management - forest economics - growing stock - forests - valuation - yields - theory - netherlands - forest stands - forest valuation
Literatuurstudie naar voorraden en verblijftijden van elementen in bosecosystemen
Vries, W. de; Hol, A. ; Tjalma, S. - \ 1990
Wageningen : Staring Centrum (Rapport / Staring Centrum 94) - 205
bibliografieën - biomassa - chemie - bosbouw - humus - houtaanwas - literatuur - strooisel - nederland - plantensamenstelling - onderzoek - wortels - bodem - bodemchemie - opstandsontwikkeling - opstandsstructuur - waterrelaties - wetenschap - bibliographies - biomass - chemistry - forestry - increment - literature - litter (plant) - netherlands - plant composition - research - roots - soil - soil chemistry - stand development - stand structure - water relations - science
Diameterbijgroei en boomafstand bij lijnvormige beplantingen van Populier
Jansen, J.J. - \ 1990
In: Studiekring De Populier: Verslag Studiekringdag Kon. Ned. Bosbouw Ver. / Schmidt, P., - p. 231 - 235.
grondvlak - diameter - voorspellen - bosbouw - omtrek - groene zones - groeimodellen - heggen - hoogte - houtaanwas - bepaling van groeiplaatshoedanigheden - plaatsen op afstand - dunnen - bomen - volume - oogstvoorspelling - opbrengsttabellen - bosopstanden - basal area - forecasting - forestry - girth - green belts - growth models - hedges - height - increment - site class assessment - spacing - thinning - trees - yield forecasting - yield tables - forest stands
De bruikbaarheid van het houtoogstprognosesysteem "Hopsy" als hulpmiddel bij bosbedrijfsplanning : een case study in de boswachterij Smilde
Hinssen, P.J.W. - \ 1989
Wageningen : De Dorschkamp (Rapport / Rijksinstituut voor Onderzoek in de Bos- en Landschapsbouw "De Dorschkamp" nr. 546) - 142
bosbouw - opbrengsten - theorie - houtaanwas - staande opstand - bossen - rotaties - aanbodsevenwicht - vraag - aanbod - econometrische modellen - wiskundige modellen - bosbedrijfsvoering - opbrengstregeling - velling - bosexploitatie - forestry - yields - theory - increment - growing stock - forests - rotations - supply balance - demand - supply - econometric models - mathematical models - forest management - yield regulation - felling - forest exploitation
Growth and development of Scots Pine in The Netherlands.
Leersnijder, R.P. - \ 1989
In: Unification of European forest pattern research : proceedings of a workshop organized by the Forest Ecosystem Research Network (FERN) of the European Science Foundation (EFS), held in Strasbourg, France, 24 - 26 April 1989 / Schmidt, P., Oldeman, R.A.A., Teller, A., - p. 115 - 118.
biomassa - computersimulatie - milieufactoren - experimenten - bosbouw - bosbouwkundige handelingen - groei - houtaanwas - meting - nederland - houtteelt - simulatie - simulatiemodellen - opstandsontwikkeling - opstandsstructuur - statistiek - bomen - pinus sylvestris - biomass - computer simulation - environmental factors - experiments - forestry - forestry practices - growth - increment - measurement - netherlands - silviculture - simulation - simulation models - stand development - stand structure - statistics - trees
Forest dynamics, SILVI-STAR : a comprehensive monitoring system
Koop, H. - \ 1989
Agricultural University. Promotor(en): R.A.A. Oldeman. - S.l. : Koop - ISBN 9783540515777 - 229
bosbouw - plantenecologie - bomen - autecologie - habitus - levensvorm - plantenontwikkeling - groeimodellen - houtaanwas - voorspellen - synecologie - meting - experimenten - statistiek - simulatie - modellen - onderzoek - opstandsstructuur - opstandsontwikkeling - natuurlijke opstanden - forestry - plant ecology - trees - autecology - habit - life form - plant development - growth models - increment - forecasting - synecology - measurement - experiments - statistics - simulation - models - research - stand structure - stand development - natural stands - cum laude
<p>To learn about the interactions between individual trees and between trees and other forest organisms, long-term monitoring of spontaneous forest development is necessary. A complete monitoring system has been developed including a computer package for analysis of long-term forest dynamics observations. A method of nested plot data collection on forest architecture and plant species composition has been worked out for monitoring purposes. The spatial and temporal relations between data are numerically expressed. Therefore a three-dimensional single-tree architectural model has been worked out to describe asymmetric tree shapes with a minimum of measured data points. Time series of forest development at different sites are built up on the basis of a digital descriptive model of the complex reality of forest structure and species composition.</p><p>To guarantee continuity in data storage and data query a commercially available database and a geographical information system were used in the design of the information system. A visual interpretation of data is enabled by graphical system outputs such as profiles and ground plans of tree crown projections, providing substitutes for traditional profile drawings and maps. Application programs were developed to solve specific problems, as a step towards predictive models. In an application program, for integration with remote sensing studies, an aerial view of the forest canopy is simulated on the basis of measured plot data. This view provides a ground-truth reference for the training and interpretation of remote sensing images. To explain the growth of individual trees and the distribution patterns of herbs and tree regeneration on the forest floor, another application was developed, simulating the penetration of direct and of diffuse light. For the reconstruction of forest growth with tree ring data, a technique of animation was elaborated facilitating a visual interpretation of the forest development. The system is applied to demonstrate forest development in some European forest reserves using forest architectural descriptions and vegetation releves, tree ring data and historical sources.</p>
Onderzoek naar het optreden van topsterfte bij de Corsicaanse den (Pinus nigra var. maritima) : eindr␁apport over het onderzoek in de periode 1969 t/m 1986
Blok, H. ; Burg, J. van den - \ 1988
Wageningen : De Dorschkamp (Rapport / Rijksinstituut voor Onderzoek in de Bos- en Landschapsbouw "De Dorschkamp" nr. 527) - 68
bosbouw - bomen - insecten - afsterving - mortaliteit - knoppen - bladeren - scheuten - houtaanwas - hoogte - diameter - grondvlak - bosschade - beschadigingen - voedingsstoffentekorten - mineralen - as - planten - mineraalgehalte - forestry - trees - insects - dieback - mortality - buds - leaves - shoots - increment - height - basal area - forest damage - injuries - nutrient deficiencies - minerals - ash - plants - mineral content
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