Reducing forest fragmentation in long-term forest planning by using the shape index Export

@article{ohman05, abstract = {The fragmentation of old forests is an aspect of forest development that has to be considered in long-term forest planning. Although several measures of the spatial structure of forests have been reported in the literature, very few have been evaluated with respect to their usefulness in long-term forest planning. The objective of this study was, therefore, to investigate if it is possible to use of one of these measures, the shape index, as a criterion in the optimization model for decreasing the fragmentation of old forest in the landscape The shape index is evaluated by solving a two-objective problem with simulated annealing, which aims at maximizing the net present value and minimizing the shape index for a landscape consisting of 924 stands. In a case study, the stated problem was converted to a one-objective problem by weighting the two objectives together. The study showed clear differences in the spatial patterns of old forest between the different weight combinations. With a higher weight on the shape index, the old forests become more clustered and the number of small and isolated patches of old forest decrease compared with a low weight on the shape index. The results also indicate that it is possible to considerably improve the shape index with only a small sacrifice in net present value. It is also clear from the case study that the shape index is a computationally well-behaved measure to use in optimization. The solution times for the different cases were generally very short.}, author = {\"{O}hman, Karin and L\"{a}m\r{a}s, Tomas}, citeulike-article-id = {2823094}, citeulike-linkout-0 = {http://dx.doi.org/10.1016/j.foreco.2005.03.059}, citeulike-linkout-1 = {http://www.sciencedirect.com/science/article/B6T6X-4G5BJJP-1/1/56eeb0fac88c36f4b482825498f87dc3}, day = {1}, doi = {10.1016/j.foreco.2005.03.059}, journal = {Forest Ecology and Management}, keywords = {forestry, fragmentation, old-growth}, month = {July}, number = {1-3}, pages = {346--357}, posted-at = {2008-05-22 14:59:02}, priority = {3}, title = {Reducing forest fragmentation in long-term forest planning by using the shape index}, url = {http://dx.doi.org/10.1016/j.foreco.2005.03.059}, volume = {212}, year = {2005} }

TY - JOUR ID - ohman05 L3 - citeulike-article-id:2823094 N2 - The fragmentation of old forests is an aspect of forest development that has to be considered in long-term forest planning. Although several measures of the spatial structure of forests have been reported in the literature, very few have been evaluated with respect to their usefulness in long-term forest planning. The objective of this study was, therefore, to investigate if it is possible to use of one of these measures, the shape index, as a criterion in the optimization model for decreasing the fragmentation of old forest in the landscape The shape index is evaluated by solving a two-objective problem with simulated annealing, which aims at maximizing the net present value and minimizing the shape index for a landscape consisting of 924 stands. In a case study, the stated problem was converted to a one-objective problem by weighting the two objectives together. The study showed clear differences in the spatial patterns of old forest between the different weight combinations. With a higher weight on the shape index, the old forests become more clustered and the number of small and isolated patches of old forest decrease compared with a low weight on the shape index. The results also indicate that it is possible to considerably improve the shape index with only a small sacrifice in net present value. It is also clear from the case study that the shape index is a computationally well-behaved measure to use in optimization. The solution times for the different cases were generally very short. IS - 1-3 JF - Forest Ecology and Management EP - 357 TI - Reducing forest fragmentation in long-term forest planning by using the shape index VL - 212 SP - 346 KW - forestry KW - fragmentation KW - old-growth AU - Öhman, Karin AU - Lämås, Tomas PY - 2005/07/01/ UR - http://dx.doi.org/10.1016/j.foreco.2005.03.059 ER -