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Accueil du site → Doctorat → Chine → 2017 → Characteristics of Soil Carbon Stock and Responses to Grassland Degradation of Different Communities in Inner Mongolia Steppe

Université de Mongolie-Intérieure (2017)

Characteristics of Soil Carbon Stock and Responses to Grassland Degradation of Different Communities in Inner Mongolia Steppe

张艳;

Titre : Characteristics of Soil Carbon Stock and Responses to Grassland Degradation of Different Communities in Inner Mongolia Steppe

Auteur : 张艳;

Grade : Master’s Theses 2017

Université : Université de Mongolie-Intérieure

Résumé
Recent years,study of ecosystem carbon sequestration is one of the most important research fields in ecology.The grassland ecosystem carbon pool is mainly concentrated in the soil,and then the grassland soil carbon pool is often affected by the community types,the soil environment background and the grassland use types With the typical steppe of Inner Mongolia as the object,this paper revealed correlation relationships between soil organic carbon,inorganic carbon and biomass,biodiversity,community types and the effects of the grassland degradation on soil organic carbon and inorganic carbon through soil organic carbon and inorganic carbon content and density in different grasslands.The results are as follow:1.In the typical steppe,soil organic carbon content was significantly positively related to aboveground,belowground and total biomass,yet soil organic carbon density was not.The notable correlation was not found between soil total carbon,soil inorganic carbon content and density and aboveground and underground biomass.2.All soil organic carbon,inorganic carbon and total carbon content and density tended to be not apparently influenced by diversity of community.3.Both soil organic carbon content and density varied significantly between communities in typical steppe.The range of soil carbon content and density were 7-11g/kg and 1.02-1.35g/m2 for Luymus chinensis community,10-13g/kg and 1.38-1.52g/m2 for S.grandis,6.8-9.8g/kg and 0.81-1.49g/m2 for Stipa krylovii,6-10g/kg and 0.85-1.16g/m2 for Cleistogenes squarrosa community + Artemisia frigida communities and 6-7g/kg and 0.9-1.17g/m2 for Potentilla acaulis + Artemisia frigida.As for the same community,soil carbon content and density have obvious regional differences.4.The effects of grassland degradation on soil carbon stock were more complex.The remarkable decline in soil organic carbon occurred in the severely degraded communities,but not in the other degraded communities.The content and density of soil inorganic carbon were not significant amog all degraded communities

Mots clés : community type; degradation grade; soil organic carbon; soil inorganic carbon; biomass;

Présentation (CNKI)

Page publiée le 22 janvier 2018