四川卧龙三江保护区珙桐群落边缘效应的研究

通过对珙桐(Davidia involucrata)群落中心及边缘的调查研究,采用Margalef丰富度指数、Simpson物种多样性指数、Shannon-Weiner物种多样性指数、Pielou均匀度指数等多样性指数及物种数个体数分析了群落乔木层、灌木层、草本层及总体的物种多样性。得出以下结果:样地1,从几个指标看除Simpson指数中心<南边缘<北边缘外,其余都各指标均是南边缘<北边缘<中心。样地2,珙桐群落多样性变化,从计算的几个多样性指数看物种丰富度和均匀度的变化趋势相同,都是东边缘<中心<南边缘。而物种的多样性指数是东边缘<南边缘<中心。南边缘在各个指数上都比东边缘高。

Sduty on the edge effect of Davidia involucrata community at Sanjiang Natural Reserve in Wolong,Sichuan Province

Species diversity in total,in the arbor layer,the shrub layer and the herb layer was studied in the center and edge of the Davidia involucrata community. Several diversity indices were selected for use, which were the Margalef index,Simpson index,Shannon-Weiner index,Pielou,even index. The result show that the Simpson index of the north edge is higher than the south edge,sand more higher than the north edge's,but on the other indexes the north edge,s is lower than the south edge's and much lower than the center's in the site one. In the site two,the change trend of the No. of Margalef index and Pielou index is equal,that east edge's