摘要
应用格局指数、聚集强度指数和集聚均数,研究了东大河林区金露梅(Potentilla fruticosa)种群的基本特征、盖度的空间格局及其沿海拔梯度的变化。结果表明,随着海拔升高,金露梅种群的平均多度、平均盖度、平均高度分别在海拔2 842、2 990、3 017m处达到最大,在东南坡的适宜分布海拔高度大致为2 900～3 100m;种群盖度总体上呈聚集分布,随着海拔的升高,格局指数逐渐增加,在海拔2 990m处到最大,随后出现下降和波动;聚集强度逐渐增大,在海拔2 990m处到最大,随后波动下降。造成聚集分布主要是由金露梅种群的生存环境引起的。
The basic characteristics, coverage spatial pattern and the change along altitudinal gradient of Potentilla fruticosa population in Dongdahe forest areas of Qilian Mountains Nature Reserve were studied by using the methods of pattern indexes, accumulation intensity indexes and accumulation mean values. The results showed that the average population abundance, the average coverage and average height of Potentilla fruticosa reached their maximum values at an altitude of 2 842, 2 990 and 3 017 m, respectively. The appropriate altitude of P. fruticosa population distribution were about 2 900 -- 3 100 m in the south east slope. The population coverage was an aggregated distribution. With altitude elevating, the pattern index increased gradually and reached the maximum value at 2 990 m, and then fluctuated and declined. The change of accumulation intensity had the same pattern as the pattern index. The main reason for the aggregated distribution of P. fruticosa population was the survival environment of P. fruticosa population.
出处
《草业科学》
CAS
CSCD
北大核心
2012年第5期804-808,共5页
Pratacultural Science
基金
甘肃省星火计划项目
关键词
东大河林区
金露梅种群
空间格局
海拔梯度
格局指数
Dongdahe forestarea
Potentilla fruticosa population
spatial pattern
altitudinal gradient
pattern index
