Abstract
Understanding the vertical distributions of soil organic carbon (SOC) is key to predicting and simulating the influences of climate, global change, and human activities on the terrestrial carbon cycle. SOC was measured at soil depths of 0–10, 0–20, 0–30, 0–50, and 0–100 cm in 2473 soil profiles during China’s second national soil survey that was conducted from 1979 to 1992. SOC was spatially extrapolated for China. Mean SOC densities in the top 1 m ranged from 4.65 kg/m2 for bare ground to 17.32 kg/m2 in grassland land cover. SOC in the top 1 m of soil was estimated at 82.5 ± 19.5 Pg C. The total SOC pool held in the top 10, 20, 30, 50, and 100 cm are 22%, 41%, 54%, 74%, and 100%, respectively. One of the objectives of the study is to examine the association of SOC content with climate and to estimate SOC storage in land-cover types at different soil depths. A partial correlation analysis shows that the mean annual precipitation was positively correlated with SOC content and the mean annual temperature was negatively correlated with SOC content, across all depths. The vertical distribution of SOC had a slightly stronger association with temperature than with precipitation in China.
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Acknowledgements
This research was jointly funded by the National Key Basic Research and Development Program (2002CB412501) and the Integrated Interdisciplinary Science Plan of Land-Use/Land-Cover and Terrestrial Carbon Process (CXIOG-E01-02-02 and CXIOG-E01-02-04) from Institute of Geographical Sciences and Natural Resources Research. Additional financial support for this work includes funds from 2001 CAS K.C. Wong Post-doctoral Research Award Fund and 2002 START 11th Fellowship Award.
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Wang, S., Huang, M., Shao, X. et al. Vertical Distribution of Soil Organic Carbon in China . Environmental Management 33 (Suppl 1), S200–S209 (2004). https://doi.org/10.1007/s00267-003-9130-5
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DOI: https://doi.org/10.1007/s00267-003-9130-5