退化羊草草原浅耕翻撩荒植物群落演替动态的研究

本文对退化草场浅耕翻撩荒处理后群落演替动态进行了研究，9年的结果如下；群落植物的多样性指数在9年中呈开口向上的抛物线状发布，植物种的均匀性指数呈开口向上的抛物线状分析，群落的稳定性呈波动状态，演替过程可分为羊草11－12年生杂草，羊草群落和羊草10多年生杂类草原群三个阶段，从第7年开始，演替向原生植被方向进行，羊草重要值在九年中分布符合方程y=202.9-78.4/x-0.22/x^2，表明在演替开始的前几年，羊草重要值增加较快，随着时间推移，增加变缓并保持在一定水平。

The Study on Dynamics Succession of Community in Degenerated Steppe of Aneurolepidium chinense after Shallow Plouyning

This paper is an analysis study on dynamics successionof community in degenerated steppe of A. chinense after shallow ploughing. The results are as follows: Diversity index of species in community appears an open-up parabola for 9 years, the regression equation is y=2. 43-0. 49x+0.0396x~2(r= 0.75). Homogeneity index of community appears an open-up-parabola for 9 years, the regression e- quation is y=1. 43-0.285x+0.027x~2(r=0.773). Stability of community may be devided into three stages. The first stage is cmmunity of A. chinense+short lived plant; The second stage is community of A. chinense, and the third stage is community of A. chinense+perenial grass; The direction of suc- cession is oriented to the primary vegetation at the seventh year. The regression equation of impor- tance value of A. chinense can be expressed as y=202.9-78.4/x-0. 22/x~2(r~2=0. 8722).