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Ningxia University (2021)

Effects of Grazing on Litter Decomposition and Litter Arthropod in Ningxia Desert Steppe

陈蔚

Titre : Effects of Grazing on Litter Decomposition and Litter Arthropod in Ningxia Desert Steppe

Auteur : 陈蔚

Grade : Master 2021

Université : Ningxia University

Résumé partiel
Grazing is one of the main disturbance modes in Ningxia desert steppe,which is easily lead to land degradation and desertification,and then seriously damage the structure and function of grassland ecosystem.Litter decomposition is one of the key process links in the material cycle of grassland ecosystem.And litter arthropod in litter decomposition is an important biological driving force to accelerate material cycle.However,it is still unclear about the effect of grazing disturbance on litter decomposition process and the distribution of litter arthropod in Ningxia desert steppe.The present study was to explored the effect of grazing on the relationship between litter decomposition and litter arthropod in Ningxia desert steppe.The litter decomposition rate and nutrient release of Leymus secalinus,Lespedeza potaninii and their mixture were investigated within 30-and 250-mesh litterbags in semiarid grasslands under grazing and enclosure management in Ningxia.We mainly carried out the following research :(1)Determined the decomposition variation characteristics of L.secalinus,L.potaninii and their mixture under the enclosure and grazing grassland,and clarified the regularity of litter decomposition rate and nutrient release under grazing ;(2)Investigated the litter meso-and microfauna diversity of L.secalinus,L.potaninii and their mixture at different decomposition times,and counted the distribution of litter arthropod during the decomposition of the litter,and explored the response of litter arthropod diversity in different litter under the enclosure and grazing grassland ;(3)Calculated the contribution rate of arthropod to litter decomposition,the influence of soil animals on litter decomposition under grazing conditions was analyzed.The research results are of great significance for understanding the relationship between aboveground and underground ecosystems under grazing disturbance,and provide ecological arguments for ecosystem management,grassland nutrient cycle and degraded ecosystem restoration in Ningxia desert grassland.

Mots clés : Grazing ;Desert steppe ;Litter decomposition ;Nutrient release ;Litter arthropod ;

Présentation (CNKI)

Page publiée le 6 avril 2022