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Chinese Academy of Agricultural Sciences (2014)

Study on Carbon Storage in Stipa Breviflora Desert Steppe under Different Grazing Systems

胡向敏;

Titre : Study on Carbon Storage in Stipa Breviflora Desert Steppe under Different Grazing Systems

Auteur : 胡向敏;

Grade : Doctoral Dissertation 2014

Université : Chinese Academy of Agricultural Sciences

Résumé
The Stipa breviflora desert steppe of Inner Mongolia is a transitional ecosystem from grassland todesert, its ecological environment is harsh, its stability is poor, and the response of ecosystem to climateand environment change is sensitive. Study on the change characteristics of its organic carbon storage ofunder different grazing systems, it is of great significance for further revealing the cycle process andmechanism of grassland ecosystem and global carbon storage.The change characteristics of soil, root,aboveground plant and litter organic carbon storage were studied under different grazing systems ingrowing season from2012to2013, which were continuous grazing (CG), rotational grazing(RG) andnon-grazing(NG) based on grassland grazing experiment platform in Stipa breviflora desert steppeestablished in Sonid Right Banner of Inner Mongolia in1999.Discussing the response of soil-plantecosystem organic carbon storage to different grazing systems, in order to provide theoretical referencefor grassland reasonable use from the perspective of carbon storage.The main conclusions were asfollows:1. The monthly change and seasonal change of plant organic carbon storage were obvious, theorganic carbon storage change of root and above ground plant were a single peak curve, reached thepeak in August, and the litter organic carbon storage change showed the principle of V type, theminimum value appeared in August.2. Grazing systems could change the monthly change course of soil organic carbon storageobviously. The seasonal change of soil organic carbon storage had different trends among different years,and interannual change of root, aboveground plant and litter organic carbon storage were obvious.3. Early grazing at the beginning of May was benefit for root organic carbon storage accumulationunder rotational grazing, while mid-grazing in mid of May and early June was good for soil,aboveground plant and litter organic carbon storage accumulation.4. The components contributions to ecosystem organic carbon storage existed an obviousdifference, that was soil>root>aboveground plant>litter, soil organic carbon storage could lead toecosystem organic carbon storage change, underground part organic carbon storage was the main carbonpool.5. The comprehensive analysis suggested that reasonable grazing systems contributed to ecosystemorganic carbon storage accumulation, the order was NG>RG>CG under different grazing systems,deferred grazing was better than early grazing under rotational grazing

Mots clés : desert steppe; grazing systems; carbon storage; soil; root systems; aboveground plant; litter;

Présentation (CNKI)

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