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Accueil du site → Doctorat → Chine → 2021 → Mechanisms and Ecosystem Effects of Dung Beetles on Livestock Dung Decomposition in a Typical Steppe of Inner Mongolia

Inner Mongolia University (2021)

Mechanisms and Ecosystem Effects of Dung Beetles on Livestock Dung Decomposition in a Typical Steppe of Inner Mongolia

程建伟

Titre : Mechanisms and Ecosystem Effects of Dung Beetles on Livestock Dung Decomposition in a Typical Steppe of Inner Mongolia

Auteur : 程建伟

Grade : Doctoral Dissertation 2021

Université : Inner Mongolia University

Résumé partiel
In recent years,with the increase of livestock stocking rate driven by the strong human demand for animal products from natural grassland,the deposition of livestock dung has significantly altered the nutrient cycling of grassland ecosystems,that has a series of ecosystem-level effects.It is imperative to understand the regulatory factors in dung decomposition for understanding the nutrient cycling of grazing grassland ecosystem and developing ecologically healthy grassland management regimes.Many studies have been done on the individual and interactive effects of dung quality,climate conditions and soil decomposer communities on dung decomposition,but the effects of soil fauna in the decomposition of large herbivores dung are not well understood.The arthropods such as dung beetles also play an important role in dung decomposition by feeding,crashing and moving the dung pellets,which alters dung physicochemical properties and has cascade effect on the structure of soil micro-food webs under the dung pellets,whereas the role of arthropods(dung beetles)in the process of dung decomposition is relatively less studied.We did an in situ experiment using the’dung and soil’ mesocosm to investigate the separate and combined effects of two functionally contrasting dung beetle species,a dweller Aphodius sordecens and a tunneler Onthophagus gibbulus,and the interaction of precipitation,dung types and soil fauna,on the decomposition processes of the dung from horses and cattle,the two major grazers with different digestive systems in native steppes in northern China.We determined the changes in dung mass,dung C and N contents,microbial respiration from the ’dung and soil’ mesocosm,and the soil micro-food web community composition from the soil beneath the dung pats under five different dung treatments,that is,1-soil only,no dung,no beetle ;2-soil with dung,no beetle ;3-soil with dung and dwelling beetles ;4-soil with dung and tunneling bettles ;and5-soil with dung,and dwelling and tunneling bettles

Mots clés : dung beetle ;precipitation;dung decomposition ;nutrient release ;soil micro-food web ;

Présentation (CNKI)

Page publiée le 20 octobre 2021