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Library Catalogue

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    Union Catalogue of Agricultural Libraries in the Netherlands

    The WUR Library Catalogue contains bibliographic data on books and periodicals held by the libraries of Wageningen University and Research Centre and some 15 associated libraries. Holding data are added to each record.

    Subjects covered include Agrotechnology, Food and Food Production, Plant and Animal Sciences, Soil Science, Geo-information, Landscape and Spatial Planning, Water and Climate, Ecosystem Studies, Economics and Society.

    The joint collections of the participating libraries cover a substantial part of the internationally available scientific literature in these disciplines.

    As far as Dutch scientific literature in these fields is concerned, coverage can be considered near 100%, including much of the so-called "grey literature".

    All titles are entered in their original language. Keywords are added to facilitate subject searching.

    The database is updated every day and now contains over 830.000 records.

Record number 104555
Title Stem form and volume of Japanese larch (Larix leptolepis Gord.) in the Netherlands
show extra info.
door J. van Soest
Author(s) Soest, J. van
Publisher Wageningen : Ponsen & Looijen
Publication year 1959
Description 75 p.
Series title Uitvoerige Verslagen. Stichting Bosbouwproefstation "De Dorschkamp", Wageningen (4,1)
Notes Proefschrift Wageningen
Tutors Becking, Prof. Dr. J.H.
Graduation date 1959-04-17
Dissertation no. 253
Author abstract show abstract
The following conclusions could be made:

If for volume table construction, the form factor (f), instead of the volume (v), is used as the dependent variable, better results are obtained.

It matters little whether f is estimated from the diameter (d), or from d and height (h) together.

Estimating v (or, if more convenient, the so-called form height fh) from d only, on the other hand, leads to much greater inaccuracies.

Estimating v of f`g (g = basal area) from h only is most inaccurate.

From an accuracy point of view graphical and mathematical methods must be considered equivalent.

In actual practice, f can, for most measurements of standing timber, be derived with sufficient accuracy from a smoothing of f on d or from a mathematical solution with the aid of f = a + b log d 1,3 . One should however expect deviations of the f of a stand from the regression line, of up to 10 %.

f can be much better estimated by using the regression equation f = a + b1 log d 1,3 + b, log d 6 + b 3 log h. Then the deviations of stands are < 3 % (dx = d at x meter height).

The data investigated indicate that close initial spacings and medium to heavy thinnings lead to relatively high f values.

The error caused by using f with g as the stand f, is negligible.

It is not likely that the functions found will also apply to other tree species.

Online full textINTERNET
On paper FORUM ; STACKS ; NN31523,4,01
FORUM ; STACKS ; NN08202,253
Keyword(s) (cab) forestry / trees / forests / measurement / dimensions / volume / larix kaempferi / forest stands
Categories Coniferous Forest Trees / Forest Ecology
Publication type PhD thesis
Language English
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