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Modeling Soil Organic Carbon Storage and Its Dynamics in Croplands of China

文献类型： 外文期刊

作者： Tang Hua-jun 1 ; Qiu Jian-jun 1 ; Wang Li-gang 1 ; Li Hu 1 ; Li Chang-sheng 2 ; van Ranst, Eric 3 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China

2.Univ New Hampshire, Inst Study Earth Oceans & Space, Durham, NH 03824 USA

3.Univ Ghent, Lab Soil Sci, Dept Geol & Soil Sci WEI3, B-9000 Ghent, Belgium

关键词： China;cropland;DNDC model;soil organic carbon

期刊名称：AGRICULTURAL SCIENCES IN CHINA （ 影响因子：0.82； 五年影响因子：0.997 ）

ISSN： 1671-2927

年卷期： 2010 年 9 卷 5 期

页码：

收录情况： SCI

摘要： 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 x 10(6) 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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