Simulation of the spatial distribution of thinning area under different silvicultural subsidy systems in Japanese plantation forests
Autorzy
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Tohru Nakajima
Laboratory of Global Forest Environmental Studies, Graduate School of Agricultural and Life Sciences
University of Tokyo 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113– 8657, Japan
phone: +81-3-5841-5708, fax: +81-3-5841-5235
e-mail: nakajima@fr.a.u-tokyo.ac.jp -
Hidesat Kanomata
Forestry and Forest Products Research Institute
1 Matsunosato, Tsukuba 305-8687, Japan -
Satoshi Tatsuhara
Laboratory of Forest Management, Graduate School of Agricultural and Life Sciences
University of Tokyo 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan -
Norihiko Shiraishi
Laboratory of Forest Management, Graduate School of Agricultural and Life Sciences
University of Tokyo 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
Abstract
The aim of this study was to simulate the effect of spatial thinning on the distribution of non-industrial private forests (NIPFs) and predict the thinning area under different subsidy systems in Hokkaido prefecture, Japan. The simulated thinning area is based on a Geographic Information System (GIS) and an algorithm that considers the stand condition and applicability of different subsidies for conducting thinning. The accuracy of the simulations was checked by comparing observed and predicted thinning area data. In Shimokawa municipality the thinning area was significantly smaller than in Furano municipality, where the rules governing subsidy allocations are more relaxed. The coefficients of determination (R2), which were calculated by comparing the estimated and observed jointly implemented thinning areas, defined as areas in which thinning occurred in several adjacent subcompartments, were 0.88 and 0.89 in Furano and Shimokawa, respectively. Although our algorithm slightly overestimated the jointly implemented thinning area, the estimated average thinning area was within the two-sided 95% confidence interval for the observed area. By applying the model and linking our simulation results to the GIS, the total potential distribution of jointly implemented thinning area was visualized in two geographic areas that have different subsidy systems.
Keywords
| DOI | |
|---|---|
| Source | Folia Forestalia Polonica, Series A – Forestry |
| Print ISSN | 0071-6677 |
| Online ISSN |
2199-5907 |
| Type of article |
original article |
| Original title |
Simulation of the spatial distribution of thinning area under different silvicultural subsidy systems in Japanese plantation forests |
| Publisher | The Committee on Forestry Sciences and Wood Technology of the Polish Academy of Sciences and the Forest Research Institute in Sekocin Stary |
| Date | 18/03/2011 |