摘要
以黄土丘陵区华家岭杨树低效生态公益林改造的典型模式———人工云杉林为研究对象,采用典型取样法,对研究区域内分布于西段、中东段和南段的云杉林进行调查研究,分析其群落结构特征。结果表明:①华家岭人工云杉林成分群落结构较为简单,灌木层、草本层的结构参数均与乔木层的结构参数呈负相关关系;②区域内云杉林个体植株集中分布于低高度级与小径级范围内,多属幼龄林。且受立地条件的影响,西段、中东段、南段云杉林树高、胸径表现出较大的差异,中东段的云杉林长势优于西段和南段的云杉林;③人工云杉林初植密度偏大,且大多为纯林。这制约了区域林分的结构优化,可能对黄土丘陵区生态公益林的持续发展带来一定的不利影响。
In this paper, the planted Picea asperata forest, a typical mode of transforming the low benefit ecologi- cal public welfare Populus forest in the Huajialing loess hilly region, was investigated and researched, and the com- munity structure of the Picea asperata Mast. forest in the western, central-eastern and southern parts of the study ar- ea was analyzed. The results are as follows ： （1） The community structure of the planted Picea asperata Mast. forest in the study area was simple, and there was a negative correlation between the structural parameters of arborous lay- er and of shrub and herbaceous layers; （2） The Picea asperata Mast. forest was dominated by young trees with low height and small DBH. Affected by the site conditions, there was a big difference in DBH and height of Picea asperata Mast. trees, and the Picea asperata Mast. forest in the central-eastern part grew better than that in the western and southern parts ; （3） Growth of the planted Picea asperata Mast. forest was repressed by the high planting density, the proportion of pure forest was too high, and these were disadvantageous for sustainable development of ecological public welfare forest in the loess hilly region.
出处
《干旱区研究》
CSCD
北大核心
2014年第1期88-93,共6页
Arid Zone Research
基金
甘肃省高等学校研究生导师科研项目"黄土丘陵区低效公益林改造技术及生态风险评价"(1202-01)
关键词
人工云杉林
群落结构
低效林
改造
华家岭
黄土丘陵
Picea asperata Mast.
community structure
low benefit forest
reformation
Huajialing
loess hilly region
