荒漠草原主要植物种群数量特征对群落数量特征的影响

Effects of Quantitative Characteristics of Main Plant Populations on Quantitative Characteristics of Community in Desert Steppe

为探讨放牧强度季节调控下短花针茅荒漠草原主要植物种群数量特征对群落数量特征的影响程度和影响规律,并对其进行相应的对比评价。本试验选取内蒙古锡林郭勒盟苏尼特右旗朱日和镇短花针茅荒漠草原为研究对象,设置6个放牧处理,采用随机区组试验设计。选取主要植物种群及群落高度、盖度、密度和生物量等数量特征指标,结合方差分析、比值分析等研究方法,探讨建群种短花针茅(Stipa breviflora)、优势种无芒隐子草(Cleistogenes songorica)和碱韭(Allium polyrhizum),主要植物种群(包含建群种和优势种),其他植物种群(除建群种和优势种以外的所有种群)以及群落在放牧处理间、放牧季节间和放牧年度间的差异,结果表明:主要植物种群(包含短花针茅、无芒隐子草和碱韭)数量特征在干旱的年份较高,占群落的比值较大;在SA1和SA5处理区主要植物种群数量特征表现较高;在5月、7月和10月,主要植物种群数量特征表现较高。

In order to explore the influence degree and law of the quantitative characteristics of main plant populations on the quantitative characteristics of community in Stipa Breviflora Desert Steppe under seasonal regulation of grazing intensity,and make corresponding comparative evaluation.Stipa breviflora desert steppe was selected as the research object in this experiment.Six grazing treatments were set up and using randomized block arrangement,selection of main plant populations and community height,coverage,density and biomass,such as the number of feature index,using the method of statistical analysis,to explore Stipa breviflora,Cleistogenes songorica and Allium polyrhizum,the main plant populations and other plant populations and community between grazing treatment,grazing and grazing annual differences between seasons.The results showed that the quantitative characteristics of the main plant populations(Stipa breviflora,Cleistogenes songorica and Allium polyrhizum,were higher in drought years and accounted for a larger proportion of the community.The quantitative characteristics of main plant populations in SA1 and SA5 treatment areas were higher.In May,July and October,the quantitative characteristics of the main plant populations were higher.