Effect of Land Use Conversion from Rice Paddies to Vegetable Fields on Soil Phosphorus Fractions

作     者：J. L. DARILEK HUANG Biao LI De-Cheng WANG Zhi-Gang ZHAO Yong-Cun SUN Wei-Xia SHI Xue-Zheng 

作者机构：Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Science Chinese Academy of SciencesNanjing 210008 (China) Graduate University of the Chinese Academy of Sciences Beijing 100039 (China) 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2010年第20卷第2期

页      面：137-145页

核心收录：

学科分类：0818[工学-地质资源与地质工程] 09[农学] 0903[农学-农业资源与环境] 0901[农学-作物学] 090301[农学-土壤学] 

基　　金：Project supported by the National Science & Technology Pillar Program of China during the Eleventh Five-Year Plan Period (No. 2008BADA7B02) the National Natural Science Foundation of China (No. 40773075) the Natural Science Foundation of Jiangsu Province,China (No. BK2007262) 

主　　题：inorganic phosphorus organic phosphorus peri-urban agriculture phosphorus accumulation soil fertility 

摘      要：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-i 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 fractious. 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.