Effects of land-use changes on organic carbon in bulk
soil and associated physical fractions in China's
Horqin Sandy Grassland |
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| Authors: | YuQiang Li YinPing Chen ShaoKun Wang WenDa Huang and JianPeng Zhang |
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| Institution: | 1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
2. School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China |
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| Abstract: | The Horqin Sandy Grassland is one of the most seriously desertified areas in China's agro-pastoral ecotone due to its fragile
ecology, combined with improper and unsustainable land management. We investigated organic carbon changes in bulk
soil (0 to 5 cm), light fraction of soil organic matter, and soil particle-size fractions induced by land-use and cover type
changes. The results indicated that total soil organic carbon (SOC) storage decreased by 121 g/m2 with the conversion of
grassland into farmland for 30 years, and increased by 261 g/m2 with the conversion of grassland into plantation for 30
years. Total SOC storage decreased by 157 g/m2 as a result of severe grassland desertification due to long-term continuous
livestock grazing, whereas total SOC increased by 111 g/m2 following the practice of grazing exclusion (16 years) in
desertified areas. Changes in land-use and cover type also show great effects on carbon storage in soil physical fractions. |
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| Keywords: | carbon storage soil fraction desertification restoration |
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