Pedosphere 20(2): 137--145, 2010
ISSN 1002-0160/CN 32-1315/P
©2010 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Effect of land use conversion from rice paddies to vegetable fields on soil phosphorus fractions
J. L. DARILEK1,2, HUANG Biao1,2, LI De-Cheng1, WANG Zhi-Gang1, ZHAO Yong-Cun1, SUN Wei-Xia1 and SHI Xue-Zheng1
1 Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China)
2 Graduate University of the Chinese Academy of Sciences, Beijing 100039 (China)
      Excess phosphorus (P) from agricultural soils contributes to eutrophication in water bodies. Samples (n=60) were taken from sites where rice paddies have been converted to vegetable fields for 0, < 10, 10-20, and > 20 years and analyzed for five inorganic P (Pi) fractions, three organic P (Po) fractions, and several soil parameters to investigate how land use conversion affects Pi and Po fractions in a peri-urban area of China with soils characteristic of many agricultural areas of Asia. Significant increases of 33, 281, 293, and 438 mg kg-1 were found for soluble and loosely bound Pi (SL-Pi), aluminum-bound Pi (Al-Pi), calcium-bound Pi (Ca-Pi), and iron-bound Pi (Fe-Pi), respectively, after conversion from rice paddies to vegetable fields. Most of the increase in Pi was in the form of Fe-Pi, which increased from 8% of total P (TP) on paddy soil to 31% on the soil with > 20-year vegetable cultivation, followed by Al-Pi, which increased from 2% to 19% of TP. For Po fractions, there was no significant change in P concentrations. The conversion of land use from paddy fields to high intensity vegetable fields was causing significant changes in soil P fractions. Management practices were causing a buildup of soil P, primarily in the Fe-Pi fraction, followed by Ca-Pi and Al-Pi fractions. If current trends continue, a 30%-70% increase in TP could be expected in the next 20 years. Farmers in the area should reduce P application and use to maximize P uptake.
Key Words:  inorganic phosphorus, organic phosphorus, peri-urban agriculture, phosphorus accumulation, soil fertility
Citation: Darilek, J. L., Huang, B., Li, D. C., Wang, Z. G., Zhao, Y. C., Sun, W. X. and Shi, X. Z. 2010. Effect of land use conversion from rice paddies to vegetable fields on soil phosphorus fractions. Pedosphere. 20(2): 137-145.
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