林分密度对北京山区不同龄级油松人工林生长的影响  

Effects of Stand Density on the Growth of Pinus tabulaeformis Plantation with Different Ages

作　　者：梁佳宁 周晓东 薛柳 田会鹏 Liang Jianing;Zhou Xiaodong;Xue Liu;Tian Huipeng(Beijing Xishan Experimental Forest Farm,Beijing 100093,China)

机构地区：[1]北京市西山试验林场,北京100093

出　　处：《防护林科技》2020年第8期5-10,共6页Protection Forest Science and Technology

摘　　要：利用北京市二类资源调查数据,结合历年来各种文献资料,对北京山区油松(Pinus tabulaeformis)人工林密度对林木生长影响进行了研究。结果表明:(1)北京山区油松人工林90%以上分布在2000株·hm-2之下,在一定林分密度范围内,林分密度对Ⅰ龄级油松人工林各生长因子影响不大,对Ⅱ龄级油松人工林平均树高影响不大,对平均蓄积量影响最大,平均胸径次之;对Ⅲ、Ⅳ龄级油松各生长因子影响较大,具有一致性,影响的大小依次为:平均蓄积量>平均树高>平均胸径。(2)林分密度在阴坡对平均树高、平均胸径的影响明显高于阳坡;对平均蓄积量的影响则低于阳坡;在低山区域对平均树高、平均胸径及平均蓄积量的影响均低于中山区域。Using the data of Beijing Forest Resources Inventory,combined with various literatures in the past years,the impact of stand density on the growth of forest trees were studied,Result shows that:(1)More than 90%of Pinus tabulaeformis plantations in Beijing mountainous areas are distributed under 2000 plants·hm-2.Within the certain range of stand density of Pinus tabulaeformis plantations,the effect of the stand density is small on the growth factor of AgeⅠand the average height of AgeⅡ;it has the greatest impact on average accumulation,followed by average DBH;the effect of the stand densityon the growth factors of AgeⅢand AgeⅣis in order:average accumulation>average height>mean DBH;(2)The effect of stand density on the average tree height&average DBH on shady slopes is significantly higher than that on sunny slopes;the impact on the average stand volume is lower on shady slopes than that on sunny slopes;the effect on average height,mean DBH and average stand volume in the low mountain area is lower than that in the middle medium area.

关 键 词：油松人工林 林分密度 平均树高 平均胸径 平均蓄积量 

分 类 号：S791.254[农业科学—林木遗传育种]