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Effect of long-term grazing on soil organic carbon content in semiarid steppes in Inner Mongolia

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Effect of long-term grazing on soil organic carbon content in semiarid steppes in Inner Mongolia

In: Ecological Research, 2005, Vol.20(5), pp.519-527
Autor: Cui, Xiaoyong , Wang, Yanfen , Niu, Haishan , Wu, Jing , Wang, Shiping , Schnug, Ewald , Rogasik, Jutta , Fleckenstein, Jürgen , Tang, Yanhong
Ort, Verlag, Jahr: Tokyo, Springer-Verlag, 2005
ISBN/ISSN/ISMN: 0912-3814
Kollektion: SpringerLink
Erscheinungsform: article

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Autor:Cui, Xiaoyong
Autor:Wang, Yanfen
Autor:Niu, Haishan
Autor:Wu, Jing
Autor:Wang, Shiping
Autor:Schnug, Ewald
Autor:Rogasik, Jutta
Autor:Fleckenstein, Jürgen
Autor:Tang, Yanhong
Titel:Effect of long-term grazing on soil organic carbon content in semiarid steppes in Inner Mongolia
Zusammenfassung:To clarify the response of soil organic carbon (SOC) content to season-long grazing in the semiarid typical steppes of Inner Mongolia, we examined the aboveground biomass and SOC in both grazing (G-site) and no grazing (NG-site) sites in two typical steppes dominated by Leymus chinensis and Stipa grandis , as well as one seriously degraded L. chinensis grassland dominated by Artemisia frigida . The NG-sites had been fenced for 20 years in L. chinensis and S. grandis grasslands and for 10 years in A. frigida grassland. Aboveground biomass at G-sites was 21–35% of that at NG-sites in L. chinensis and S. grandis grasslands. The SOC, however, showed no significant difference between G-site and NG-site in both grasslands. In the NG-sites, aboveground biomass was significantly lower in A. frigida grassland than in the other two grasslands. The SOC in A. frigida grassland was about 70% of that in L. chinensis grassland. In A. frigida grassland, aboveground biomass in the G-site was 68–82% of that in the NG-site, whereas SOC was significantly lower in the G-site than in the NG-site. Grazing elevated the surface soil pH in L. chinensis and A. frigida communities. A spatial heterogeneity in SOC and pH in the topsoil was not detected the G-site within the minimal sampling distance of 10 m. The results suggested that compensatory growth may account for the relative stability of SOC in G-sites in typical steppes. The SOC was sensitive to heavy grazing and difficult to recover after a significant decline caused by overgrazing in semiarid steppes.
In:Ecological Research, 2005, Vol.20(5), pp.519-527
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