题目：Model-based investigation on the effects of spatial evenness, and size selection in thinning of Norwegian spruce stands
主讲简介：Peter Fransson，瑞典于默奥大学博士。研究专长：数学生物。Peter Fransson，瑞典于默奥大学博士，现在于默奥大学综合科学实验室工作，主要从事林业资源利用和保护的建模，发表高水平论文10余篇。
主讲内容：Size and spatial distribution of trees are important for forest stand growth, but it has rarely been documented to what degree they matter in thinning operations, in terms of wood production and stand economy. Here we investigate how the choice of spatial evenness and tree-size distribution of residual trees will impact wood production and stand economy. A spatially explicit individual-based growth model was used, in conjunction with empirical cost functions for harvesting and forwarding, to calculate net production and net present value for different thinning operations in Norway spruce stands in Northern Sweden. The in silico thinning operations are defined by three variables: 1) spatial evenness after thinning, 2) tree size preference for harvesting, and 3) basal area reduction.