期刊
SPRINGERPLUS
卷 2, 期 -, 页码 -出版社
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1186/2193-1801-2-S1-S1
关键词
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资金
- Chinese National Natural Science Foundation [30671660]
- New Century Excellent Talents in University of China ministry of education [NCET-05-0137]
- Specialized Research Fund for the Doctoral Program of Higher Education of China ministry of education [20050022014]
- Research and Demonstration of Carbon Sequestration Technology in the Northern Fast-growing Forest and Orchard Systems [2008BAD95B07]
- Construction Project of Carbon Sequestration Capacity Accounting and Monitoring System in Beijing Urban Green Space System
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(-1); light grazing (LG), 0.91 sheep.ha(-1); moderate grazing (MG), 1.82 sheep.ha(-1), and heavy grazing (HG), 2.73 sheep.ha(-1). 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.
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