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Land-use impact on soil carbon and nitrogen sequestration in typical steppe ecosystems, Inner Mongolia

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文摘 To explore the optimal land-use for soil carbon (C) sequestration in Inner Mongolian grasslands, we investigated C and nitrogen (N) storage in soil and soil fractions in 8 floristi- cally and topographically similar sites which subjected to different land-use types (free-grazing, grazing exclusion, mowing, winter grazing, and reclamation). Compared with free-grazing grasslands, C and N storage in the 0-50 cm layer increased by 18.3% (15.5 Mg C ha~(-1)) and 9.3% (0.8 Mg N ha~(-1)) after 10-yr of grazing exclusion, respectively, and 21.9% (18.5 Mg C ha~(-1)) and 11.5% (0.9 Mg N ha~(-1)) after 30-yr grazing exclusion, respectively. Similarly, soil C and N storage increased by 15.3% (12.9 Mg C ha~(-1)) and 10.2% (0.8 Mg N h~(a-1)) after 10-yr mowing, respectively, and 19.2% (16.2 Mg C ha~(-1)) and 7.1% (0.6 Mg N ha~(-1)) after 26-yr mowing, respectively. In contrast, soil C and N storage declined by 10.6% (9.0 Mg C ha~(-1)) and 11.4% (0.9 Mg N ha~(-1)) after 49-yr reclamation, respectively. Moreover, increases in C and N storage mainly occurred in sand and silt fractions in the 0-10 cm soil layer with grazing exclusion and mowing. Our findings provided evidence that Inner Mongolian grass- lands have the capacity to sequester C and N in soil with improved management practices, which were in the order: grazing exclusion > mowing > winter grazing > reclamation.
来源 Journal of Geographical Sciences ,2012,22(5):859-873 【核心库】
DOI 10.1007/s11442-012-0968-4
关键词 carbon ; grazing ; land-use ; nitrogen ; reclamation ; soil fractions
地址

1. Institute of Geographic Sciences and Natural Resources Research, CAS, Key Laboratory of Ecosystem Network Observation and Modeling, CAS, Beijing, 100101  

2. Institute of Botany, CAS, State Key Laboratory of Vegetation and Environmental Change, Beijing, 100093  

3. Inner Mongolia Agricultural University, Hohhot, 010018  

4. Institute of Natural Resources, Inner Mongolia University, Huhhot, 010021

语种 英文
ISSN 1009-637X
学科 自然地理学
基金 National Natural Science fundation of China ;  "Strategic Priority Research Program-Climate Change: Carbon Budget and Related Issues" of the Chinese Academy of Sciences
文献收藏号 CSCD:4695618

参考文献 共 45 共3页

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2 He Nianpeng Carbon and Nitrogen Storage in Inner Mongolian Grasslands: Relationships with Climate and Soil Texture Pedosphere,2014,24(3):391-398
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