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Accueil du site → Master → Chine → 2022 → The Decomposition Process of Reaumuria Soongorica Litter and the Contribution of Arthropod in Shrub Microhabitats in Semi-Arid and Arid Regions

Ningxia University (2022)

The Decomposition Process of Reaumuria Soongorica Litter and the Contribution of Arthropod in Shrub Microhabitats in Semi-Arid and Arid Regions

蒋嘉瑜

Titre : The Decomposition Process of Reaumuria Soongorica Litter and the Contribution of Arthropod in Shrub Microhabitats in Semi-Arid and Arid Regions

Auteur : 蒋嘉瑜

Grade : Master 2022

Université : Ningxia University

Résumé partiel
In arid and semi-arid regions,Reaumuria soongorica has the characteristics of drought resistance,salinity resistance,stress resistance and sand-collecting ability.It can grow in arid environment for a long time,and it has become an extremely important plant species to maintain the stability of the fragile ecosystem of desert steppe.Due to the dual effects of climate and human disturbance,the R.soongorica woodland is severely degraded.To promote the ecological restoration of the R.soongorica woodland,the vegetation construction of Caragana korshinskii as the main plant species was carried out in the degraded area.C.korshinskii and R.are inlaid and distributed to form a compound shrubgrass system.The microenvironment formed by C.korshinskii shrubs not only affects the distribution of litter arthropods and the decomposition process of R.soongorica litter but also affects the decomposition of litter arthropods on R.soongorica litter.In this study,in semi-arid region(Yanchi,Ningxia)and arid area(Urad Rear Banner,Inner Mongolia)desert steppe area,the microhabitat inside and outside the C.korshinskii shrubs was selected as the research sample,the R.soongorica litter was used as the research object,and the use of mesh The litter decomposition bag method was used to investigate the distribution characteristics of arthropod communities in microhabitats inside and outside the shrubs,and to determine the mass loss and nutrient release dynamics of R.soongorica litter in the shrub microhabitats.The action law of mass loss and nutrient release dynamics revealed the action mechanism of litter arthropod in shrub microhabitats on the decomposition of R.soongorica litter under different water and heat conditions.The main results are as follows :(1)During the decomposition process of R.soongorica litter,only when the litter was decomposed in December.The abundance and group richness of litter arthropods were found to be significantly higher in the open spaces than beneath shrub canopy in semi-arid region,but the group richness of litter arthropods was found to be significantly lower in the open spaces than beneath shrub canopy only in arid region(P>0.05).There were no significant differences in Shannon-Wiener index and Margalef index between the two shrub microhabitats at either of the study sites(P>0.05).In addition to soil total carbon,which is a common factor affecting the distribution of litter arthropods.in the study area,it is also mainly affected by soil conductivity,pH value,clay silt and total nitrogen in semi-arid region,while in arid region,it is also mainly affected by soil water content and soil C/N

Mots clés : arid and semi-arid regions ;shrub microhabitat ;Reaumuria soongorica litter ;decomposition process ;litter arthropod contribution rate ;

Présentation (CNKI)

Page publiée le 1er novembre 2022