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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Acknowledgments
We would like to express appreciation to Dr. Ma Qiang and Dr. Liu Shuxia for supplying the data. We wish to express our appreciation to Wang Shaoqiang for reviewing the manuscript. This research was supported by grants from the National Natural Science Foundation of China (30225012) and Chinese Academy of Sciences (2002CB412501).
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Yu, G., Fang, H., Gao, L. et al. Soil organic carbon budget and fertility variation of black soils in Northeast China. Ecol Res 21, 855–867 (2006). https://doi.org/10.1007/s11284-006-0033-9
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DOI: https://doi.org/10.1007/s11284-006-0033-9