| 农田土壤中的磷向水体释放的风险评价 |
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| 引用本文： | 高超,张桃林,吴蔚东.农田土壤中的磷向水体释放的风险评价[J].环境科学学报,2001,21(3):344-348. |
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| 作者姓名： | 高超 张桃林 吴蔚东 |
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| 作者单位： | 中国科学院南京土壤研究所 |
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| 基金项目： | 中国科学院“九五”重大项目! (KZ95 1 A1 30 1)，中国科学院特别支持项目! (KZ95T 0 4 0 1) |
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| 摘 要： | 通过对比土壤的固磷能力和磷素水平可以评估不同类型土壤中的磷向水体释放的风险。研究表明，磷吸持指数（SI）可以作为土壤最大吸磷量的替代指标来表征土壤的固磷能力。在太湖地区，影响水土界面磷素迁移能力的主要因素是土壤有效磷水平和土壤固磷能力。SI值30左右为一临界值，SI大于此值的土壤对于施磷具有较大的缓冲能力，而SI低于此值的土壤对施磷非常敏感，磷流失风险将随施磷量的增加而呈直线上升趋势。
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| 关 键 词： | 太湖流域 非点源污染 农田土壤磷素 吸持指数 风险评价 水体 |
| 文章编号： | 0253-2468(2001)-03-0344-05 |
| 收稿时间： | 5/8/2000 12:00:00 AM |
| 修稿时间： | 2000年5月8日 |
Risk evaluation of agricultural soil phosphorus release to the water bodies |
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| GAO Chao,ZHANG Taolin and WU Weidong.Risk evaluation of agricultural soil phosphorus release to the water bodies[J].Acta Scientiae Circumstantiae,2001,21(3):344-348. |
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| Authors: | GAO Chao ZHANG Taolin and WU Weidong |
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| Affiliation: | Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008,Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 and Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 |
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| Abstract: | The risks of agricultural soil phosphorus loss to surface waters in Taihu lake watershed were evaluated by comparing the P sorption capacity with available P level in different kinds of soils. The results showed that phosphorus sorption index (SI) is a simple yet adequate paramenter to estimate P sorption capacity,which can be used to characterize the potential of a given soil for P release to runoff as a result of P amendments. In the studied area the SI value 30 is a critical point.Above the value soils have a considerable buffering capacity to the addition of P, but soils with SI value less than 30 are very sensitive to P amendments. So it is pointed that great risk of P loss may happen if excessive amount of P fertilizer is applied to these soils. |
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| Keywords: | Tahu lake watershed nonpoint source pollution soil phosphorus sorption index risk evaluation |
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