黑龙江省东部森林群落β多样性的研究

β diversity of forest communities in east Heilongjiang Province.

以连续带指数和集合环境梯度作为植物群落演替动态和环境质量的定量指标，探讨了黑龙江省东部森林群落β多样性随环境梯度和演替动态的变化规律．结果表明，森林群落中植物种的β多样性βＺ和昆虫种的β多样性βＫ都随环境梯度的增加而升高，即随着环境质量升高群落间物种更替速率降低，且βＫ的变化滞后于βＺ．βＺ和βＫ与连续带指数（ＣＩ）呈非线性相关，在演替初期群落间物种更替速率较高，在演替中后期群落间物种的更替速率最小．βＫ曲线的峰值出现滞后于βＺ曲线。

Using continuum index( CI ) and collective habitat gradient( Gc ) as quantitative indexes of plant community succession and habitat quality, this paper studied the β diversity of forest communities in east Heilongjiang Province. The β diversities of plant species( β Z ) and insect species( β K ) were increased with increasing of habitat gradient, i.e. the species turnover rate between communities declined as habitat quality increased, and β K lagged behind β Z . The relationships between β Z and CI and between β K and CI were close nonlinear. At initial succession stage, the species turnover rate between communities was higher, while at middle and end succession stages, it was the lowest. The peak value of β K lagged behind β Z , showing that the change of insect species diversity depended upon that of plant species.