Modeling Soil Organic Carbon Storage and Its Dynamics in Croplands of China |
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| Authors: | TANG Hua-jun QIU Jian-jun WANG Li-gang LI Hu LI Chang-sheng Eric van Ranst |
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| Institution: | 1. School of Environmental and Natural Resources, Key Laboratory of Recycling and Eco-treatment of Waste Biomass of Zhejiang Province, Zhejiang University of Science and Technology, Hangzhou 310023, PR China;2. Key Laboratory of Agro-Environment, The Ministry of Agriculture of China, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, PR China;3. Institute of Soil, Fertilizer and Water-saving Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou 730070, PR China;2. Carbon Management and Sequestration Center, School of Environment and Natural Resources, The Ohio State University, Columbus, Ohio, USA;1. The senior author was a visiting scholar at C-MASC, The Ohio State University, Columbus, Ohio, USA;1. College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China;2. University Key Lab for Geomatics Technology and Optimize Resources Utilization in Fujian Province, Fuzhou 350002, China;1. Augsburg University, Institute of Geography, Augsburg, Germany;2. University of California, Merced, Life and Environmental Sciences, Merced, CA, USA;3. Université catholique de Louvain, Earth & Life Institute, TECLIM, Louvain-la-Neuve, Belgium;4. Leibniz Centre for Agricultural Landscape Research, Institute of Soil Landscape Research, Müncheberg, Germany;5. Ghent University, Isotope Bioscience Laboratory – ISOFYS, Ghent, Belgium;6. University of Potsdam, Institute of Earth and Environmental Sciences, Potsdam, Germany |
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| Abstract: | Soil organic carbon (SOC) is one of the centre issues related to not only soil fertility but also environmental safety.Assessing SOC dynamics in croplands has been a challenge in China for long due to the lack of appropriate methodologies and data sources. As an alternative approach for studying SOC dynamics, process-based models are adopted to meet the needs. In this paper, a process-based model, DeNitrification-DeComposition (DNDC), was applied to quantify the SOC storage and the spatial distribution in croplands of China in 2003, with the support of a newly compiled county-level soil/climate/land use database. The simulated results showed that the total SOC storage in the top layer (0-30 cm) of the 1.18 × 108 ha croplands of China is 4.7-5.2 Pg C in 2003 with an average value of 4.95 Pg C. The SOC storage in the northeastern provinces (1.3 Pg C) accounts for about 1/4 of the whole national totals due to their dominantly fertile soils with high organic matter content. SOC density ranges from 3.9 to 4.4 kg C m-2, with an average of 4.2 kg C m-2, a level is much lower than the world average level. The model results also indicated that high rates of SOC losses occurred in the croplands with the most common cropping patterns in China as like single soybean > maize > paddy > cotton > winter wheat and corn rotation. The results reported in this paper showed that there was still a great potential for improving SOC status in most croplands of China by adopting proper farming practices and land-use pattern. Therefore, long-term policy to protect SOC is urgently needed. |
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| Keywords: | China cropland DNDC model soil organic carbon |
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