Storage and Spatial Variation of Phosphorus in Paddy Soils of China  

作　　者：LIN Jin-Shi SHI Xue-Zheng LU Xi-Xi YU Dong-Sheng WANG Hong-Jie ZHAO Yong-Cun SUN Wei-Xia 

机构地区：[1]State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 2100(78 (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)

出　　处：《Pedosphere》2009年第6期790-798,共9页土壤圈（英文版）

基　　金：Project supported by the National Key Basic Research Program (973 Program) of China (No. 2007CB407206);the National Natural Science Foundation of China (No. 40621001);the Frontier Project of the Chinese Academy of Sciences (No. ISSASIP0715)

摘　　要：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.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 1：1000 000 digital soil map of China, and using 1490 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.

关 键 词：paddy soil database paddy soil subgroups phosphorus density phosphorus pool 

分 类 号：S155.292[农业科学—土壤学] TU311.3[农业科学—农业基础科学]