管涔山撂荒地植物群落演替过程中优势种种间关系分析

采用一次性同时调查的方法获得数据,运用X~2-检验、Spearman秩相关指数分析方法对管涔山余庄乡撂荒地植物群落在演替过程中优势种种间关系进行了研究.结果表明:(1)依据TWINSPAN分类,把所取得的39个样方划分为7个群丛,分别属于演替过程中的三个不同阶段--草本群落阶段(包括群丛I1、I2、I3)、灌丛群落阶段(包括群丛II1和II2)和森林群落阶段(包括群丛III1和III2).(2)在X~2-检验的基础上,运用Spearman秩相关分析每个演替阶段种对间的关系,结果显示不同演替阶段种对间的关系不同.如在草本群落阶段,白莲蒿和黄芪呈正相关,而在灌丛群落阶段,二者则表现为负相关,这可能是因为物种适应不同微环境而表现出的差异.但正负关联比呈增加趋势(0.78→0.86→1.09),说明了植物群落是向着群落稳定的方向发展.(3)本研究结果支持随着群落演替进程的发展,正关联比例越高,群落结构越趋于稳定,多物种可以稳定共存,群落达到与环境条件相适应的稳定阶段的观点.

Analysis on Interspecific Relation of Dominant Species of Plant Communities During Succession on Abandoned Farmlands in Guancei Mountain,Shanxi

Succession data were collected from the filed in different succession stages simultaneously. On the basis of TWINSPAN,the interspecific relations of dominant species plant communities' during succession on abandoned farmlands in Guancei Mountain Shanxi were studied by using X~2-test and Spearman's rank correlation coefficient. The results indicated that:(1) 39 samples were divided into seven groups, belonging to the three stages of vegetation succession by using TWINSPAN classification being the herbaceous stage (including Assoc. I1,I2 and I3), the scrub community stage(including Assoc. II1 and II2) and the forest community stage (including Assoc. III1 and III2) respectively. (2) On the basis of X~2-test, the species-pairs relationship was analysed by using Spearman's rank correlation coefficient. The result showed that the species-pairs relationships were different in different succession stage. For example,the species-pair Artemisia sacrorum and Astragaolus was positive association in the herbaceous stage but was negative association in the scrub community stage. This was probably because of the difference that species adapted to different micro-environment and showed. But the proportion of the positive and negative associaton showed the trend of increasing (0. 78→0.86→1.09),it indicated that the plant community was developing to a stable community. (3) The result of this study agree with the view that the plant community tends to the stable stage with the development of the plant community succession, that is, the longer the time of succession is,the higher the positive associaton ratio is, the steadyer the structure of the plant community is,the stronger the ability of species coexisting is.