摘要
以阿勒泰林区草地为研究对象,对各草地类型的植被特征进行调查,分析了不同草地类型下草地的地上生物量和物种多样性的变化.结果表明:①植物密度、群落盖度、地上生物量 3 种群落特征值均在山地草甸最大,而群落平均高度在山地草甸草原最大,相比之下,在荒漠草原和高寒草甸中植被长势较差;②地上生物量与群落盖度、高度、植物密度之间存在明显的正相关关系,且这种关系在统计学上是显著的,具体表现为P<0.05;③不同草地类型下,物种多样性特征呈现规律性变化,山地草甸中的Simpson指数、Alatalo指数和Shannon-Wiener指数表现较好,然而,高寒草甸的丰富度显著劣于其他草地类型;④地上生物量与Simpson指数、Shannon-Wiener指数仅在荒漠草原中的关系呈负相关,地上生物量与 Mar-garlef指数在山地草原和高寒草甸呈正相关,除山地草甸和高寒草甸外,地上生物量与 Alatalo指数均呈正相关.
Abstract
In this study,the vegetation characteristics of each grassland type were investigated,and the changes of aboveground biomass and species diversity of grassland under different grassland types were analyzed.The results showed that:① The characteristic values of plant density,community coverage and aboveground biomass were the largest in mountain meadow,while the average height of the community was the largest in mountain meadow steppe,compared with the vegetation growth in desert steppe and alpine meadow.② There was an obvious positive correlation between plant den-sity,and this relationship was statistically significant with P<0.05.③ The species diversity characteristics showed regular changes under different grassland types.The Simpson index,Alatalo index and Shannon-Wiener index performed better in mountain meadows.④ Aboveground biomass showed negative correlation with Simpson's index and Shannon-Wiener's in-dex only in desert grassland.Aboveground biomass showed positive correlation with Margarlef's index in mountain grass-land and alpine meadows,and aboveground biomass showed positive P<0.05 correlation with Alatalo's index in all except mountain meadows and alpine meadows.
维普
万方数据