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Nitrogen storage and variability in paddy soils of China
1State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
2Louisiana State University AgCenter, Baton Rouge, Louisiana, USA
3Fujian Agriculture and Forestry University, Fuzhou 350002, China
4Qingdao Agriculture University, Qindao 266000, China
Abstract. Paddy soils support important croplands in many parts of the world, especially in Asia. A thorough understanding of nitrogen (N) in Chinese paddy soils would be helpful to comprehend N cycling on farms from a national perspective. The N storage and density of paddy soils in China were evaluated employing 1490 soil profiles and a map of Chinese soils at a scale of 1:1 000 000. Results showed that the mean N density of paddy soils at 0–100 cm was 1240.0 g/m3, with N storage of 569.0 Tg. Paddy soil N density varies with different soil-water regime. In fact, waterlogged conditions can enhance paddy soil N content. Different rotation systems and various fallow systems also can affect paddy soil N density. There are significant relationships of N between both SOC and sand content. But the sensitivity of paddy soil N to climate was weak because of human activity. While this GIS-based analysis is a relatively coarse evaluation of the database, it does provide the first quantitative assessment of paddy soils N storage across China using commonly available digital databases.
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Citation: Lin, J. S., Shi, X. Z., Yu, D. S., Weindorf, D. C., Wang, H. J., Zhao, Y. C., Sun, W. X., and Liu, Q. H.: Nitrogen storage and variability in paddy soils of China, Biogeosciences Discuss., 7, 855-877, 2010. Bibtex EndNote Reference Manager
