秦岭华山松种群分布格局及动态研究

DISTRIBUTION PATTERN AND DYNAMICS OF PINUS ARMANDI POPULATION IN THE QINLING MOUNTAINS

基于相邻格子样方的野外取样方法，运用统计生态学的样方方差法、Ｇｒｅｉｇ－Ｓｍｉｔｈ格局分析法和Ｋｅｒｓｈａｗ格局强度分析法对秦岭林区不同年龄阶段华山松种群的空间分布格局、格局规模、格局强度进行了研究。结果表明：华山松种群的空间分布格局随发育阶段由集群分布—随机分布—集群分布变化；华山松种群的格局规模约１００ｍ２，４０年左右由于竞争、更新和扩展出现两个格局规模；该种群的格局强度变化缓慢，反映了种群扩散过程中较小的环境异质性和斑块间相对密度大的特点。

The method of contiguous grid quadrates was adopted to collect field data.The quadrate variance analysis,Greig Smith and Kershaw methods were used to study the spatial distribution pattern,pattern scale and pattern intensity of Pinus armandi population at different ages.The results revealed that the spatial pattern of population proceeded from the clumped distribution to random distribution,and the to clumped distribution again with growth.The population of P.armandi was characterized with the pattern scale about 100 m 2.Two types of the pattern scale appeared at about 40 ages due to population competition,regeneration and development.There was a slow change in the pat tern intensity of population,which means a smaller variation in environment and a bigger difference in the relative density of population patches during diffusion process.