间伐对华北落叶松人工林边缘效应的影响  

Effects of thinning on edge effect of Larix principis-rupprechtii plantation

作　　者：王雄宾[1] 余新晓[1] 徐成立[1,2] 谷建才[3] 周彬[1] 范敏锐[1] 贾国栋[1] 吕锡芝[1] 

机构地区：[1]水土保持与荒漠化防治教育部重点实验室,北京林业大学水土保持学院 [2]河北省木兰围场国有林场管理局 [3]河北农业大学林学院

出　　处：《北京林业大学学报》2009年第5期29-34,共6页Journal of Beijing Forestry University

基　　金：国家林业局重点科研项目(2006-69);国家林业局林业公益性行业科研专项经费项目(200804022);“十一五”国家科技支撑计划项目(2006BAD03A0201)

摘　　要：通过对实施间伐后4种保留密度下的华北落叶松人工林林缘植被进行调查,以正态分布、理查德、幂函数、指数函数、对数函数5种曲线为基础,利用距林缘距离为自变量、林下植被物种丰富度为因变量建立边缘效应模型,分析不同间伐方式对华北落叶松人工林边缘效应的影响。结果表明:距林缘50m内,密度为500株/hm2的华北落叶松人工林林下植被物种丰富度未显示出边缘效应;在900和1300株/hm2密度下,林下植被物种丰富度在林缘附近表现平稳,随距林缘距离增加,表现出先急剧减小,后又变得稳定的变化趋势;在2500株/hm2密度下,林下植被物种丰富度随着距林缘距离的增加而急剧减小,超过5.92m后变得平稳,变化曲线为"钟形"的一部分。密度为2500、1300、900株/hm2的华北落叶松人工林边缘效应距离分别是5.92、14.06、22.18m。Based on the investigation of edge vegetation of Larix principis-rupprechtii plantations with four density after thinning, the edge effect models were established according to the normal distribution, the Richard, power function, exponential function and the logarithm function curves. The distance from the forest edge is considered as an independence variable, and the species richness under the trees is considered as a dependence variable in the models. The effects of different thinning methods on edge effect of L. principis- rupprechtii were analyzed subsequently. The results showed that the species richness had not the edge effect in the area of 50 m from the forest edge in the forest of 500 trees per hectare; in the forests of 900 and 1 300 trees per hectare, the species richness indicated a stable state near the forest edge, but it decreased sharply and then became a stable state again with the distance＇s increase from the forest edge. In the forest of 2 500 trees per hectare, the species richness decreased sharply with the distance＇s increase from the forest edge, and then became smooth beyond the distance of 5.92 m. The curve presented a part of bell-shaped curve. The edge effect distance of L. principis-ruppreehtii plantation of 900, 1 300, 2 500 trees per hectare was 22.18, 14.06 and 5.92 m respectively in the investigated sample plots.

关 键 词：间伐 保留密度 边缘效应 模型 物种丰富度 华北落叶松人工林 

分 类 号：S753.51[农业科学—森林经理学]