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Université de Mongolie-Intérieure (2019)

Effects of Grassland Biodiversity and Environmental Factors on Community Productivity in Inner Mongolia

朱羚;

Titre : Effects of Grassland Biodiversity and Environmental Factors on Community Productivity in Inner Mongolia

Auteur : 朱羚;

Grade : Master’s Theses 2019

Université : Université de Mongolie-Intérieure

Résumé partiel
Global environmental change and loss of diversity make biodiversity and ecosystem function become a research hotspot,and productivity as one of the important ecosystem functions has attracted much attention.Inner Mongolia natural grassland has important ecological value,economic value and cultural value,but in recent years,due to climate change and human disturbance,the diversity and productivity are reduced,and the degraded area is increasing,which threatens the ecological security of north China.This study covers the three grassland of the grasslands of Inner Mongolia as the research object,using the community investigation,correlation analysis,variance decomposition,to set up the methods of structural equation model,explore the relationship between the Inner Mongolia grassland diversity and community productivity,and analyzed the environmental factors in Inner Mongolia steppe community productivity of direct effect and indirect effect.The main conclusions are as follows:1.There are certain differences in the community productivity among the three grassland sub-regions in Inner Mongolia.The community productivity of typical grassland and meadow grassland was significantly higher than that of desert grassland.2.There was a significant positive correlation between diversity and community productivity in Inner Mongolia grassland and its three sub-regions,but there were still differences.The community productivity of Inner Mongolia grassland was significantly correlated with species diversity,functional diversity and functional dominance indexes.Community productivity of desert grassland was significantly correlated with species richness and Rao’s secondary entropy coefficient and functional dominance index

Mots clés : Inner Mongolia grassland; Community productivity; Functional diversity; Functional dominance; Regulatory mechanism;

Présentation (CNKI)

Page publiée le 23 mai 2020