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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Logging damage and injured tree mortality in tropical forest management
Werf, Edwin van der; Indrajaya, Yonky ; Mohren, Frits ; Ierland, Ekko C. van - \ 2019
Natural Resource Modeling (2019). - ISSN 0890-8575
age-structured model - bioeconomic model - conventional logging - Faustmann - Kalimantan - logging damage - reduced impact logging - sustainable forest management - tree mortality - tropical forest

Using insights from the forest ecology literature, we analyze the effect of injured trees on stand composition and carbon stored in above-ground biomass and the implications for forest management decisions. Results from a Faustmann model with data for a tropical forest on Kalimantan show that up to 50% of the basal area of the stand before harvest can consist of injured trees. Considering injured trees leads to an increase in the amount of carbon in above-ground biomass of up to 165%. These effects are larger under reduced impact logging than under conventional logging. The effects on land expectation value and cutting cycle are relatively small. The results suggest that considering injured trees in models for tropical forest management is important for the correct assessment of the potential of financial programs to store carbon and conserve forest ecosystem services in managed tropical forests, such as reducing emissions from deforestation and forest degradation and payment for ecosystem services. Recommendations for Resource Managers Considering the role of injured trees is important for managing tropical forests These trees can cover up to 50% of basal area and contain more than 50% of the carbon stored in above-ground biomass Reduced impact logging leads to a larger basal area of injured trees and more carbon stored in injured trees than conventional logging Injured trees play an important role when assessing the potential for carbon storage in the context of payment for forest ecosystem services.

Unpacking land acquisition at the oil palm frontier: Obscuring customary rights and local authority in West Kalimantan, Indonesia
Rietberg, P.I. ; Hospes, O. - \ 2018
Asia Pacific Viewpoint 59 (2018)3. - ISSN 1360-7456 - p. 338 - 348.
community response - Indonesia - Kalimantan - land acquisition - local authority - oil palm
Very few studies have captured the full complexity of land acquisition processes at the Agricultural frontier. Specifically, the different stages in the land acquisition process and the changing responses of local communities to plantation development have not been adequately described and explained. Based on a detailed empirical case study of a land acquisition process in a village at the oil palm frontier in West Kalimantan, Indonesia, we address this knowledge gap. To comprehensively capture reactions ‘from below’ to large-scale land acquisition, we use the interlinked concepts of access, property and authority. We show that the land acquisition process is basically a process of transforming and obscuring customary property rights and local authority. In our case, this process is characterised by an initial recognition of customary rights and local authority by the oil palm company. However, in the course of the process, these property rights and local authority are being transformed and eventually obscured. We call for a more interventionist state to prepare a less uneven playing field at the very beginning of land acquisition processes. This could slow down the nearly irrevocable obfuscation of customary rights and the erosion of local authority at the oil palm frontier.
Carbon storage potential in degraded forests of Kalimantan, Indonesia
Ferraz, António ; Saatchi, Sassan ; Xu, Liang ; Hagen, Stephen ; Chave, Jerome ; Yu, Yifan ; Meyer, Victoria ; Garcia, Mariano ; Silva, Carlos ; Roswintiart, Orbita ; Samboko, Ari ; Sist, Plinio ; Walker, Sarah ; Pearson, Timothy R.H. ; Wijaya, Arief ; Sullivan, Franklin B. ; Rutishauser, Ervan ; Hoekman, Dirk ; Ganguly, Sangram - \ 2018
Environmental Research Letters 13 (2018)9. - ISSN 1748-9318
aboveground biomass mapping - airborne lidar - carbon - forest degradation - Indonesia - Kalimantan - peat swamp forests

The forests of Kalimantan are under severe pressure from extensive land use activities dominated by logging, palm oil plantations, and peatland fires. To implement the forest moratorium for mitigating greenhouse gas emissions, Indonesia's government requires information on the carbon stored in forests, including intact, degraded, secondary, and peat swamp forests. We developed a hybrid approach of producing a wall-to-wall map of the aboveground biomass (AGB) of intact and degraded forests of Kalimantan at 1 ha grid cells by combining field inventory plots, airborne lidar samples, and satellite radar and optical imagery. More than 110 000 ha of lidar data were acquired to systematically capture variations of forest structure and more than 104 field plots to develop lidar-biomass models. The lidar measurements were converted into biomass using models developed for 66 439 ha of drylands and 44 250 ha of wetland forests. By combining the AGB map with the national land cover map, we found that 22.3 Mha (106 ha) of forest remain on drylands ranging in biomass from 357.2 ±12.3 Mgha-1 in relatively intact forests to 134.2 ±6.1 Mgha-1 in severely degraded forests. The remaining peat swamp forests are heterogeneous in coverage and degradation level, extending over 3.62 Mha and having an average AGB of 211.8 ±12.7 Mgha-1. Emission factors calculated from aboveground biomass only suggest that the carbon storage potential of more than 15 Mha of degraded and secondary dryland forests will be about 1.1 PgC.

Genetic diversity of Dyera polyphylla (Miq.) Steenis populations used in tropical peatland restoration in Indonesia
Tata, Hesti Lestari ; Muchugi, A. ; Kariba, R. ; Noordwijk, M. van - \ 2018
Mires and Peat 21 (2018). - ISSN 1819-754X
AFLP - Agroforestry - Kalimantan - Paludiculture - Sumatra
Dyera polyphylla is a native tree species of peat swamp forests in Southeast Asia. Where it has been used in peatland restoration, the trees are of uncertain genetic origin. We analysed the genetic diversity of seven populations of D. polyphylla (9–20 individual trees per population) from both natural forests and plantations on peatland farms in the Indonesian provinces of Jambi and Central Kalimantan. Using six selected primers, analysis of amplified fragment length polymorphism (AFLP) indicated that 86.5–96.8 % of loci tested (280 in total) were polymorphic, with an estimated heterozygosity H ranging from 0.29 to 0.38. The highest genetic variation was within populations, rather than among them. Cluster analysis based on Nei’s distance matrix indicated that the sampled D. polyphylla populations from Jambi and Central Kalimantan were genetically distinct. STRUCTURE analysis indicated that the wild population at Senyerang (Jambi) was the most distinct. This site and Tumbang Nusa (Central Kalimantan) deserve in situ protection and are recommended as seed sources for peatland restoration in their respective provinces. In the absence of knowledge about specific traits, it is important to retain the high genetic diversity of existing wild and planted populations of D. polyphylla revealed by our work when selecting seed sources for future peat swamp forest rehabilitation programmes.
Financial mechanisms for poverty-environment issues; the case of Central Kalimantan (Kalteng)
Clements-Hunt, P. ; Diemont, W.H. ; Limin, S. ; Page, S. ; Rieley, J. ; Setiadi, B. ; Sjarkowi, F. ; Silvius, M. ; Radjagukgug, B. ; Vasander, H. ; Verhagen, J. - \ 2002
Wageningen : Alterra (Alterra-rapport 589) - 17
armoede - landschap - armoedebestrijding - biodiversiteit - economie - milieu - natuurbehoud - ontwikkelingssamenwerking - Indonesië - Kalimantan - poverty - landscape
Financial mechanisms for poverty-environment issues; the bio-rights system
Silvius, M.J. ; Setiadi, B. ; Diemont, W.H. ; Sjarkowi, F. ; Jansen, H.G.P. ; Siepel, H. ; Rieley, J.O. ; Verhagen, A. ; Beintema, A.J. ; Burnhill, L. ; Limin, S.H. - \ 2002
Wageningen : Alterra (Alterra-rapport 617) - 19
plattelandsontwikkeling - gemeenschapsontwikkeling - duurzame ontwikkeling - duurzaamheid (sustainability) - krediet - armoedebestrijding - biodiversiteit - economie - natuurbehoud - ontwikkelingssamenwerking - Indonesië - Kalimantan - rural development - community development - sustainable development - sustainability - credit
Bio-rights is an innovative financing mechanism which provides micro-credits for sustainable development to poor communities in return for their active involvement in the protection of the natural environment. Successful community involvement leads to conversion of micro-credits into definite payments, enabling sustainable development and environmental conservation to go hand in hand.
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