Soil organic carbon budget and fertility variation of black soils in Northeast China |
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Authors: | Guirui Yu Huajun Fang Lupeng Gao Wenjuan Zhang |
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Institution: | (1) Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, A 11 Datun Road, Beijing, 100101, China;(2) Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Changchun, 130012, China;(3) Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China |
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Abstract: | Black soils in Northeast China are characteristic of high soil organic carbon (SOC) density and were strongly influenced by
human activities. Therefore, any change in SOC pool of these soils would not only impact the regional and global carbon cycle,
but also affect the release and immobilization of nutrients. In this study, we reviewed the research progress on SOC storage,
budget, variation, and fertility under different scenarios. The results showed that the organic carbon storage of black soils
was 646.2 TgC and the most potential sequestration was 2887.8 g m−2. According to the SOC budget, the net carbon emission of black soils was 1.3 TgC year−1 under present soil management system. The simulation of CENTURY model showed that future climate change and elevated CO2 concentration, especially the increase of precipitation, would increase SOC content. Furthermore, fertilization and cropping
sequence obviously influenced SOC content, composition, and allocation among different soil particles. Long-term input of
organic materials such as manure and straw renewed original SOC, improved soil structure and increased SOC accumulation. Besides,
soil erosion preferred to transport soil particles with low density and fine size, decreased recalcitrant SOC fractions at
erosion sites and increased activities of soil microorganism at deposition sites. After natural grasslands were converted
into croplands, obvious variation of soil chemical nutrients, physical structure, and microbial activities had taken place
in surface and subsurface soils, and represented a degrading trend to a certain degree. Our studies suggested that adopting
optimal management such as conservation tillage in black soil region is an important approach to sequester atmospheric CO2 and to slow greenhouse effects. |
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Keywords: | Soil organic matter Soil carbon budget Soil fertility Black soils Northeast China |
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