Effects of Grazing Exclusion on Soil Active Organic Carbon Fractions in Moderately Degraded Desert of Seriphidium transiliense
In order to explore the response of soil active organic carbon fractions to grazing exclusion,this paper compared total soil organic carbon,readily oxidizable carbon,light fraction of organic carbon,particulate organic carbon at 0-50 cm depth of soil in Seriphidium transiliense desert under different grazing exclusion years (including 0 year,1 year,4 years and 11 years).The results showed that total soil organic carbon at 0-10 cm soil layer appeared decreased at first and then increased with increasing grazing exclusion years,while readily oxidizable carbon and its distribution ratio to the total were increased at 0-50 cm soil layer.The light fraction organic carbon and its component ratio at 5-10 cm soil layer were significantly higher after grazing exclusion (P ＜ 0.05).Particulate organic carbon at 0-0 cm soil layer did not change significantly after grazing exclusion,while particulate component ratios decreased significantly (P ＜ 0.05).In a word,the responses of readily oxidizable carbon and its distribution ratio,particulate component ratio,and light fraction of organic carbon and its component ratio at 5-10 cm soil layer to grazing exclusion were more sensitive than total soil organic carbon.Those parameters could be used as sensitive indicators to grazing exclusion in Seriphidium transiliense desert.
NETL
NSTL
万方数据
维普
