摘要
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:群落植物种的多样性指数在9年中呈开口向上的抛物线状分布。植物种的均匀性指数呈开口向上的抛物线状分布。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多年生杂类草群落三个阶段,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/χ-0.22/χ~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的水平。
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).
出处
《内蒙古大学学报（自然科学版）》
CAS
CSCD
1993年第2期204-207,共4页
Journal of Inner Mongolia University：Natural Science Edition
关键词
演替动态
浅耕翻
草原
群落
succession dynamics
degenerated steppe
shallow ploughing
