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作 者 ：杨允菲,张宝田

期 刊 ：生态学报 1992年 12卷 3期 页码：266~272

关键词：种内竞争；密度制约；碱化草甸；虎尾草种群；

Keywords:intraspecific competition, density dependence, alkalization meadow, population of Chloris virgata.,

摘 要 ：本文根据对松嫩平原碱化草甸天然虎尾草种群的调查和分析,选用相关性最好的函数关系作为虎尾草种群的种内竞争和密度制约特征。结果表明:平均株丛重与株丛密度之间表现为幂函数y=ax~(-b)关系;平均植株重与密度之间在拔节孕穗期为幂函数y=ax~(-b)关系,在籽实成熟期为指数函数y=ae~(-bx)关系;分蘖率与密度之间呈线性y=a-bx关系;抽穗率、单位面积穗重、平均穗重、平均穗状花序数、平均小穗数和地上生物量诸数量性状的密度制约特征均表现为指数函数y=a~(-bx)关系。根据拔节孕穗期和籽实成熟期诸相应性状参数的比较,反映了随着虎尾草的生长发育,因种内竞争,各数量性状的密度制约作用增大。

Abstract:Chloris virgata is an annual tuft grass which is more alkali tolerance. According to the investigation and the analysis of natural Ch. virgata population of alkalization meadow in the Songnen plain of China, the best correlations among simulated functions were selected to be the specifiitics of intraspecific competition and density dependence of the population in this paper. The results showed that there were the power function y = ax-b between mean tuft weight and the tuft density;the power function y = ax...

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