Abstract
Soil organic carbon (SOC) plays an important role in global carbon cycles. Large spatial variations in SOC contents result in uncertain estimates of the SOC pool and its changes. In the present study, the key variables explaining the SOC contents of croplands (CPs) and non-croplands (NCPs) in Chinese provinces were investigated. Data on SOC and other soil properties (obtained from the Second National Soil Survey conducted in the late 1970s to the early 1990s), climate parameters, as well as the proportion of the CP to the total land area (Pcp) were used. SOC content variations within a province were larger than those among provinces. Soil clay and total phosphorus content, ratio of annual precipitation to mean temperature, as well as Pcp were able to explain 75% of the SOC content variations in whole soil samples. Soil pH, mean temperature during the growing season from May to October, and mean annual wind velocity were able to explain 63% of the SOC content variations in NCP soils. Compared with NCP soils, CP soils had lower SOC contents, with smaller variations within and among provinces and lower C/N ratios. Stepwise regression showed that the soil clay content was a unique factor significantly correlated with the SOC content of CP soils. However, this factor only explained 24% of the variations. This result suggested that variables related to human activities had greater effects on SOC content variations in CP soils than soil properties and climate parameters. Based on SOC contents directly averaged from soil samples and estimated by regression equations, the total SOC pool in the topsoil (0–20 cm) of China was estimated at 60.02 Pg and 57.6 Pg. Thousands of years of intensive cultivation in China resulted in CP topsoil SOC loss of 4.34–4.98 Pg.
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References
Albrecht W A, 1938. Loss of soil organic matter and its restoration. Soils and Men: USDA Yearbook of Agriculture. Washington, DC: USDA, 347–360.
Arrouays D, Deslais W, Badeau V, 2001. The carbon content of topsoil and its geographical distribution in France. Soil Use and Management, 17(1): 7–11. doi: 10.1007/s10614-008-9152-4
Batjes N H, 2002. Carbon and nitrogen stocks in the soils of Central and Eastern Europe. Soil Use and Management, 18(4): 324–329. doi: 10.1079/SUM2002138
Cai Z C, 1996. Effect of land use on organic carbon storage in soils in eastern China. Water Air and Soil Pollution, 91(3–4): 383–393. doi: 10.1007/BF00666272
Carter M R, 2002. Soil quality for sustainable land management: Organic matter and aggregation interactions that maintain soil functions. Agronomy Journal, 94(1): 38–47.
Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, 2005. Chinese Natural Resources Database. Available at: http://www.naturalresources.csdb.cn/index.asp
Commission of Agricultural Chemistry, Soil Science Society of China, 1983. Routine Analytical Methods for Soils and Agricultural Chemistry. Beijing: Science Press, 67–78. (in Chinese)
Davidson E A, Ackerman I L, 1993. Changes in soil carbon inventories following cultivation of previously untilled soils. Biogeochemistry, 20(3): 161–193. doi: 10.1007/BF00000786
Gong Zitong, 1999. Chinese Soil Taxonomic Classification. Beijing: Science Press, 5–215. (in Chinese)
Hassink J, 1997. The capacity of soils to preserve organic C and N by their association with clay and silt particles. Plant and Soil, 191(1): 77–87. doi: 10.1023/A:1004213929699
Huang Yao, Sun Wenjuan, 2006. Changes in topsoil organic carbon of croplands in mainland China over the last two decades. Chinese Science Bulletin, 51(15): 1785–1803. doi: 10.1007/s11434-006-2056-6
Janssens I A, Freibauer A, Ciais P et al., 2003. Europe’s terrestrial biosphere absorbs 7–12% of European anthropogenic CO2 emissions. Science, 300(5625): 1538–1542. doi: 10.1126/science.1083592
Jenkinson D S, Rayner J H, 1977. The turnover of soil organic matter in some of the Rothamsted classical experiments. Soil Science, 123(5): 298–305. doi: 10.1097/00010694-197705000-00005
Jin Feng, Yang Hao, Cai Zucong et al., 2001. Calculation of density and reserve of organic carbon in soils. Acta Pedologica Sinica, 38(4): 522–528. (in Chinese)
Kundu S, Bhattacharyya R, Prakash V et al., 2007. Carbon sequestration and relationship between carbon addition and storage under rainfed soybean-wheat rotation in a sandy loam soil of the Indian Himalayas. Soil and Tillage Research, 92(1–2): 87–95. doi: 10.1016/j.still.2006.01.009
Lal R, 1999. World soils and greenhouse effect. IGBP Global Change Newsletter, March 37: 4–5.
Lal R, 2004a. Soil carbon sequestration impacts on global climate change and food security. Science, 304(5677): 1623–1627. doi: 10.1126/science.1097396
Lal R, 2004b. Soil carbon sequestration to mitigate climate change. Geoderma, 123(1–2): 1–22. doi: 10.1016/j.geoderma.2004.01.032
Li Changsheng, 2000. Loss of soil carbon threatens Chinese agriculture: A comparison on agroecosystem carbon pool in China and the U.S. Quaternary Science, 20(4): 345–350. (in Chinese)
Li Kerang, Wang Shaoqiang, Cao Mingkui, 2003. Vegetation and soil carbon storage in China. Science in China (Series D), 33(1): 49–57. (in Chinese)
Mann L K, 1986. Changes in soil carbon storage after cultivation. Soil Science, 142(5): 279–288. doi: 10.3334/CDIAC/tcm.007
Nicolardot B, Molina J A E, Allard M R, 1994. C and N fluxes between pools of soil organic matter: Model calibration with long-term incubation data. Soil Biology and Biochemistry, 26(2): 235–243. doi: 10.1016/0038-0717(94)90163-5
Oades J M, 1988. The retention of organic matter in soil. Biogeochemistry, 5(1): 35–70. doi: 10.1007/BF02180317
Pan Genxing, Li Lianqing, Zhang Xuhui et al., 2003. Soil organic carbon storage of China and the sequestration dynamics in agricultural lands. Advances in Earth Science, 18(4): 609–618. (in Chinese)
Parton W J, Rasmussen P E, 1994. Long-term effects of crop management in wheat-fallow: II. Century model simulations. Soil Science Society of America Journal, 58(2): 530–536.
Schuman G E, Janzen H H, Herrick J E, 2002. Soil carbon dynamics and potential carbon sequestration by rangelands. Environmental Pollution, 116(3): 391–396. doi: 10.1016/S0269-7491(01)00215-9
Schwager S J, Mikhailova E A, 2002. Estimating variability in soil organic carbon storage using the method of statistical differentials. Soil Science, 167(3): 194–200.
Song G H, Li L Q, Pan G X et al., 2005. Topsoil organic carbon storage of China and its loss by cultivation. Biogeochemistry, 74(1): 47–62.
SSSSC (State Soil Survey Service of China), 1993. China Soil Series, Vol. 1. Beijing: China Agricultural Press. (in Chinese)
SSSSC (State Soil Survey Service of China), 1994a. China Soil Series, Vol. 2. Beijing: China Agricultural Press. (in Chinese)
SSSSC (State Soil Survey Service of China), 1994b. China Soil Series, Vol. 3. Beijing: China Agricultural Press. (in Chinese)
SSSSC (State Soil Survey Service of China), 1995a. China Soil Series, Vol. 4. Beijing: China Agricultural Press. (in Chinese)
SSSSC (State Soil Survey Service of China), 1995b. China Soil Series, Vol. 5. Beijing: China Agricultural Press. (in Chinese)
SSSSC (State Soil Survey Service of China), 1996. China Soil Series, Vol. 6. Beijing: China Agricultural Press. (in Chinese)
Tang H J, Qiu J J, Ranst E V et al., 2006. Estimations of soil organic carbon storage in cropland of China based on DNDC model. Geoderma, 134(1–2): 200–206. doi: 10.1016/j.geoderma.2005.10.005
The Editorial Committee of Chinese Natural Resources Series, 1996. Chinese Natural Resources Series (Land). Beijing: China Environmental Science Press, 99–100. (in Chinese)
Vleeshouwers L M, Verhagen A, 2002. Carbon emission and sequestration by agricultural land use: A model study for Europe. Global Change Biology, 8(6): 519–530.
Wang Shaoqiang, Liu Jiyuan, Yu Guirui, 2003. Error analysis of estimating terrestrial soil organic carbon storage in China. Chinese Journal of Applied Ecology, 14(5): 797–802. (in Chinese)
Wang Shaoqiang, Zhou Chenghu, Li Kerang et al., 2000. Analysis on spatial distribution characteristics of soil organic carbon reservoir in China. Acta Geographica Sinica, 55(5): 533–544. (in Chinese)
Wu H B, Guo Z T, Peng C H, 2003. Land use induced changes of organic carbon storage in soils of China. Global Change Biology, 9(3): 305–315. doi: 10.1046/j.1365-2486.2003.00590.x
Wu Lezhi, Cai Zucong, 2006. The relationship between the spatial scale and the variation of soil organic matter in China. Advances in Earth Science, 21(9): 965–972 (in Chinese).
Yu D S, Shi X Z, Wang H J et al., 2007. Regional patterns of soil organic carbon stocks in China. Journal of Environmental Management, 85(3): 680–689. doi: 10.1016/j.jenvman.2006.09.020
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Foundation item: Under the auspices of National Social Science Foundation of China (No. 09CJL026), Talent-gaining Program of Hubei Normal University (No. 2008F19), National Natural Science Foundation of China (No. 40621001), CAS Research Program on Soil Biosystems and Agro-Product Safety (No. CXTD-Z2005-4)
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Wu, L., Cai, Z. Key variables explaining soil organic carbon content variations in croplands and non-croplands in Chinese provinces. Chin. Geogr. Sci. 22, 255–263 (2012). https://doi.org/10.1007/s11769-012-0531-3
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DOI: https://doi.org/10.1007/s11769-012-0531-3