摘要
采用"空间序列代替时间序列"的方法,将植被恢复阶段划分为演替前期、演替中期和演替后期,并测定每一阶段植物群落特征及多样性指标.结果表明:(1)随着演替进行,地上生物总量和中旱生物植物生物量显著增加(P<0.05),中生植物生物量的大小顺序为中期>后期>前期(P<0.05),旱生植物生物量的大小顺序为中期>前期>后期(P<0.05);(2)随演替进行,Shannon-wiener多样性指数(H)、Simpson多样性指数(H')、Pielou均匀度指数(E)、Simpson均匀度指数(E')与Simpson优势度指数(D)显著减小(P<0.05),物种丰富度指数(S)的大小顺序为中期>前期>后期(P<0.05);(3)随演替进行,群落优势种狗尾草(Setaria viridis)和狗芽根(Cynodon dactylon)的重要值显著增加(P<0.05).
The re-vegetation stages were classified into successive early stage,middle stage and later stage by using an approach of spatial sequence instead of temporal sequence,and the plant community characteristics and bio-diversity index in each plot were measured. The results showed that:( 1) In the process of succession,the total aboveground and middle-xerophyte biomass significantly increased( P <0. 05),that of mesophyte were followed the order as middle stage > later stage > early stage( P < 0. 05),and that of xerophyte were followed the order as middle stage > early stage > later stage( P < 0. 05);( 2)In the process of succession,Shannon-wiener diversity index( H),Simpson diversity index( H'),Pielou evenness index( E),Simpson evenness index( E') and Simpson dominant index( D) significantly decreased( P < 0. 05),the richness index was followed the order as middle stage > early stage > later stage( P < 0. 05);( 3) The important values of dominant species such as Setaria viridis and Cynodon dactylon significantly increased in the process of succession( P < 0. 05).
出处
《湖南生态科学学报》
CAS
2016年第3期7-11,共5页
Journal of Hunan Ecological Science
基金
国家"十五"农业科技重大专项资助(编号:2001BA507A)
关键词
演替
群落特征
生物多样性
successive
community characteristics
bio-diversity
