Effects of grazing intensity on soil labile organic carbon fractions in a desert steppe area in Inner MongoliaReport as inadecuate




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SpringerPlus

, 2:S1

First Online: 11 December 2013

Abstract

Grazing can cause changes in soil carbon C level. This study aimed to elucidate the response of soil labile organic carbon SLOC under four different grazing intensities: non grazing NG, 0 sheep·ha; light grazing LG, 0.91 sheep·ha; moderate grazing MG, 1.82 sheep·ha, and heavy grazing HG, 2.73 sheep·ha. Results showed that there was no significant difference in total soil organic carbon TOC and soil inorganic carbon SIC content from three soil depths 0-15 cm, 15-30 cm, and 30-45 cm under different grazing intensities. However, the SLOC including particulate organic carbon POC, light fraction organic carbon LFOC, and readily oxidizable carbon ROC content at a depth of 0-15 cm decreased with the increasing grazing intensity among LG, MG and HG. The SLOC content at depths of 15-30 cm under the NG and LG were significantly higher than that under the MG and the HG. The TOC and SLOC content decreased with increasing depths of soil horizons, but SIC content increased. The variation trend of the density of different soil carbon fractions and the ratio of individual SLOC fractions to TOC were similar to that of the soil carbon content of corresponding fractions. These results indicated that MG and HG treatments caused C loss at 0-30 cm; and SLOC was more sensitive than TOC in response to different grazing intensities.

Keywordsgrazing intensity soil labile organic carbon desert steppe land use  Download fulltext PDF



Author: Jixin Cao - Xiaoping Wang - Xiangyang Sun - Lin Zhang - Yun Tian

Source: https://link.springer.com/



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