摘要
对小陇山林区引种黄檗人工林种群结构特征进行了分析,结果显示:33年的黄檗人工林平均林层为2.8,上层分布株数占总体株数的80.3%;林分水平分布格局呈聚集分布,平均角尺度为0.531 4;混角度为0.242 5,处于零度和弱度混交的比例为79.34%;林分出现了两极分化,平均大小比数为0.495 5,处于竞争优势和亚优势(40.72%)与竞争劣势和绝对劣势(40.42%)的比例基本相当;反映林分生长和经营空间大小的平均开敞度为0.18,生长空间严重不足;林分开始自然稀疏,枯死率9.57%。林下没有更新幼苗幼树,后备资源不足。应及时进行抚育间伐、采取人工促进天然更新措施,使引种黄檗人工林健康稳定生长。
The characteristic of population structure was analyzed in more than 33-year old Phellodendron amurense plantation introduced into Xiaolong mountain forest region. The results showed that average forest storey was 2.8 layers in the plantation. The number of trees distributed in overstory was 80.3% of the total trees. The stand, which had clumped distribution in horizontal distribution pattern and had 0.5314 average uniform angle index, was very closed to random distribution. The average mingling degree was 0.2425 in the stand with 79.34% of weak mingling degree or no mixing. There was a large differentiation and 0.4955 average neighborhood comparison in Phellodendron amurense plantation. The percentage （40.72%） of trees distributed in competitive superiority and sub- superiority was about equal to the percentage （40.42%） of trees distributed in competitive inferior position and absolute disadvantage. The stand was lack of growth space, because of opening degree was 0.18 in Phellodendron amurense plantation. The stand started to self thinning and had a 9.57% senescence rate. There was not enough reserve resources due to no regenerated saplings and seedlings in the stand. Consequently, tending thinning and natural regeneration method promoted by manual work were implemented to healthy and stable growth of introduced Phellodendron amurense plantation.
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2017年第6期75-82,共8页
Journal of Central South University of Forestry & Technology
基金
国家林业公益性行业科研专项"重要树种种质资源保存与可持续利用关键技术研究"(201204307)子课题
天水市科技支撑项目"小陇山引进树种适生性评价"(201509)
关键词
黄檗
引种
种群
结构特征
Phellodendron amurense
introduction
population
structural characteristics
作者简介
胡勐鸿，工程师
通讯作者：吕寻，高级工程师；E-mail：lvzhihui2725220@163．com
