Pedosphere 19(6): 790--798, 2009
ISSN 1002-0160/CN 32-1315/P
©2009 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Storage and spatial variation of phosphorus in paddy soils of China
LIN Jin-Shi1,3,4, SHI Xue-Zheng1,3, LU Xi-Xi2, YU Dong-Sheng1, WANG Hong-Jie1, ZHAO Yong-Cun1 and SUN Wei-Xia1
1 State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China)
2 Department of Geography, National University of Singapore, 119260 (Singapore)
3 Graduate University of the Chinese Academy of Sciences, Beijing 100049 (China)
4 College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002 (China)
ABSTRACT
      Due to the growing concern about the agricultural phosphorus (P) losses pollution, an in-depth understanding of P in paddy soils of China would be helpful in providing a national perspective of the environmental impact of P cycling and fertility on China's farms. In this study, we evaluated the P storage and the P density of paddy soils in China, characterized the spatial variations of P among the subgroups of paddy soils and soil regions in China, and evaluated the P data using GIS-based analysis, which included a newly compiled 1:1 000 000 digital soil map of China, and using 1 490 soil profiles. The available and total P densities of paddy soils were 6.7 and 698.5 g m-3, respectively. Overall in China, the total P storage within 1 m of paddy soils was estimated to be 330.2 Tg. The P density of paddy soils varied substantially with subgroups due to the different soil water regimes such as groundwater table and soil drainage. The P availability in paddy soils, especially in surface layer, was higher in high temperature and precipitation areas. Further research is needed to examine more anthropogenic impact factors, such as increasing use of chemical fertilizer.
Key Words:  paddy soil database, paddy soil subgroups, phosphorus density, phosphorus pool
Citation: Lin, J. S., Shi, X. Z., Lu, X. X., Yu, D. S., Wang, H. J., Zhao, Y. C. and Sun, W. X. 2009. Storage and spatial variation of phosphorus in paddy soils of China. Pedosphere. 19(6): 790-798.
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