抚育间伐强度对侧柏林及林下植被生长的影响  

Effects of Thinning Intensity on the Growth of Platycladus orientalis and Understory Vegetation

作　　者：刘文 王敏增 兰欣 温静 王奇峰 

机构地区：[1]北京市西山试验林场,北京100093

出　　处：《东北林业大学学报》2016年第7期4-7,18,共5页Journal of Northeast Forestry University

基　　金：北京市森林资源固定样地动态监测项目

摘　　要：以北京市西山试验林场干旱阳坡侧柏为研究对象,分析抚育间伐强度与侧柏林生长、天然落种更新、林下植被生长及林下植物多样性的变化特征,并对不同间伐强度进行森林健康等级评价。结果表明:抚育间伐对林木单株的直径和高生长具有显著的促进作用;天然更新的数量及其分布特征与抚育间伐强度关系较大,低强度间伐林分天然更新数量和种类较少,随着间伐强度增大,更新数量和种类随之增加,40%间伐强度为40%时,林内中生树种更新最多;抚育过程中林窗的分布情况是决定林下灌、草植物多样性及其分布特征的主要因素;不同强度抚育后林下植物Simpson多样性指数和Shannon-Wiener多样性指数增大;从生产力、群落结构功能、抵抗力(干扰)、效益等4个方面9个指标对林分健康等级进行评价,间伐强度为40%时,林分达到健康水平。Taking Platycladus orientalis on arid sunny mountain slopes of Beijing xishan experimental forest farm as object of study,we studied the effect of tending thinning intensity on Platycladus orientalis forest growth,nature falling seed regeneration,undergrowth vegetation growth and change characteristics of plant diversity,and evaluated the different thinning intensity on forest health level.The tending thinning played a significant promoting role on the diameter and height of single tree.There is close connection between the quantity and distribution characteristics of natural regeneration and tending thinning intensity.Low intensity thinning forest stand leads to less natural regeneration and variety,with the increase of thinning intensity,the number and variety of natural regeneration increase accordingly.When thinning intensity reaches40%,shade-tolerance tree species in forest area regenerate the greatest.The distribution of forest gap during tending process decides the diversity and distribution of undergrowth forests and grass plant.Under different intensities of tending,undergrowth Simpson and Shannon Wiener diversity index are increased.We evaluated forest health level based on productivity,community structure features,resistance（interference）,benefits and nine indexes,and 40% thinning intensity can achieve healthy forest stand.

关 键 词：侧柏林 间伐强度 林木生长 多样性指数 

分 类 号：S718.5[农业科学—林学]