新疆富蕴地区草地生物量与物种多样性及VOR指数的关系

The study on the relationship between VOR index andbiomass and species diversity of grasslandin fuyun district of Xinjiang

摘要:

为了解草地生物量对物种多样性和草地生态系统健康的影响,以2020年新疆富蕴地区草地群落为研究对象,通过计算物种多样性指数Margalef丰富度指数、Simpson优势度指数、Shannon-Wiener多样性指数和Alatalo均匀度指数)、VOR评价指数并结合草地生物量来探讨三者之间关系。结果表明:1)富蕴地区神钟山林区和沙库尔布拉克林区地上生物量存在显著差异(P＜0.05),沙库尔布拉克林区和其他林区Margalef丰富度指数和Shannon-Wiener多样性指数存在显著差异(P＜0.05),喀依尔特林区和沙库尔布拉克林区的Simpson优势度指数和Alatalo均匀度指数存在显著差异(P＜0.05)。2)各林区VOR指数评价中沙库尔布拉克林区处于不健康水平。3)富蕴地区草地物种多样性和VOR指数随着地上生物量的增加呈现出先增大后降低的趋势,表现出典型的单峰关系,主要与草地生产力、物种间共生、竞争有关。

Abstract:

To understand the impact of grassland biomass on species diversity and grassland ecosystem health,the grassland community in Fuyun area of Xinjiang was studied in 2020.The relationship among grassland biomass,species diversity and grassland ecosystem was investigated by calculating Margalef diversity index,Simpson dominance index,Shannon-Wiener richness index,Alatalo evenness index and VOR evaluation index.The results show that: 1) There are significant differences in biomass between the Shenzhongshan forest area and the Shakuerbulake forest area in the Fuyun area (P＜0.05);there are obvious differences in Margalef richness index and Shannon-Wiener diversity index between Shakuerbulake area and other forest areas (P＜0.05);the Simpson dominance index and the Altalo evenness index in the Kayierte forest area and the Shakuerbulake forest area are significantly different (P＜0.05).(2) In the evaluation of VOR index in each forest area,the Shakuerbulake forest area is at an unhealthy level.(3) The grassland species diversity and VOR index in Fuyun area increased first with the increase of biomass,and then decreased to a certain extent,showing a typical "single peak" relationship,which is mainly related to grassland productivity,interspecies symbiosis and competition.