农业环境科学学报2011，Vol.30Issue(9)：1853-1860,8.
县域农田土壤磷素积累及淋失风险分析——以北京市平谷区为例
Evaluation of Soil Phosphorus Accumulation and Loss Risk on Arable Land at County Level: The Example of Pinggu District, Beijing City, China
摘要
Abstract
The variation of phosphorus demand and input among different cropping system may cause the different surplus and risk to environment. The aim of this study is to evaluate the difference of soil phosphorus (P) accumulation and potential risk of P loss to environment among cereal, fruit and vegetable cropping systems in Pinggu District, Beijing suburb, through field survey on phosphorus application and soil analysis. The results showed that the average P input was 76, 575 kg P2O3·hnr2·a-1 and 693 kg P2OS hm-2·a-1 in cereal, vegetable and orchard systems, respectively. Manure P was the main proportion of the total P input in vegetable and orchard systems and P surplus was 468 kg P2O5· hm-2·a-1 and 498 kgP2O5·hnr-2·a-1, which was much higher than that in cereal system(38 kgP2O5·hnr-2·a-1). This caused high variation in soil Olsen-P content, which was 18.4,44.3 mg·kg-1 and 40.4 mg·kg-1 for cereal (n=260), vegetable (n=108) and orchard (ra=548) system, respectively. It was found that there were change-points when soil CaCl2-P rapid increased with soil Olsen-P was 23.1,40.1 mg·kg-1 and 51.5 mg·kg-1 for sandy loam, light loam and heavy loam soils, respectively, through the correlation analysis between soil Olsen-P and CaCl2 extracted P contents. The value of change-point was significantly higher in clay soils than loam soils. As classified with soil texture, 7.7%, 44.0% and 33.6% of the surveyed fields were with high P leaching potential in cereal, vegetable and orchard cropping system, respectively. It is necessary to manage P input in vegetable and orchard system following crop requirement and soil P fertility.关键词
Olsen-P/CaCl2-P/拐点/磷淋溶风险/粮田/果园/菜田Key words
Olsen-P/ CaCl2P/ change-point/ P leaching risk/ cereal/ vegetable/ orchard分类
资源环境引用本文复制引用
柏兆海,万其宇,李海港,段增强,陈清..县域农田土壤磷素积累及淋失风险分析——以北京市平谷区为例[J].农业环境科学学报,2011,30(9):1853-1860,8.基金项目
公益性行业(农业)科研专项“农作物最佳养分管理技术研究与应用”(201103003) （农业）
北京市果类蔬菜产业创收团队 （）
