| 太湖地区农田土壤养分动态及其启示 |
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| 引用本文： | 高超,吴蔚东,张桃林.太湖地区农田土壤养分动态及其启示[J].地理科学,2001,21(5):428-432. |
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| 作者姓名： | 高超 吴蔚东 张桃林 |
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| 作者单位： | 1. 南京大学城市与资源学系,中国科学院南京土壤研究所,
2. 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)共同资助 |
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| 摘 要： | 太湖地区人地关系紧张，环境问题尤其是地表水体富营养化严重，农田生态系统的养分收支和土壤养分状况不仅关系到农业的高产稳产，对区内的水环境质量也有着重要的影响。典型区的实地调查和采样分析结果表明，自20世纪80年代初以来太湖地区农田生态系统中的氮、磷一直处于盈余状态，且盈余量不断增加，土壤钾素则长期亏缺，但近年来有所缓和。区内土壤有机质、全氮、全磷和有效磷含量近20年来都有较大幅度的提高，速效钾含量在20世纪90年代中期以前呈下降趋势，近年来有所回升。主要类型土壤的pH也呈降低的趋势。
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| 关 键 词： | 太湖流域 养分平衡 养分状况 土壤养分管理 钾 氮 磷 pH值 |
| 文章编号： | 1000-0690(2001)05-0428-05 |
Agricultural Soil Nutrient Status in Taihu Lake Areaand Its Implication to Nutrient Management Strategies |
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| GAO Chao ,ZHANG Tao-lin ,WU Wei-dong.Agricultural Soil Nutrient Status in Taihu Lake Areaand Its Implication to Nutrient Management Strategies[J].Scientia Geographica Sinica,2001,21(5):428-432. |
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| Authors: | GAO Chao ZHANG Tao-lin WU Wei-dong |
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| Institution: | GAO Chao 1,2,ZHANG Tao-lin 2,WU Wei-dong 1,2 |
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| Abstract: | Taihu Lake watershed region is one of the most densely populated areas in China and is confronted with numerous environmental problems, especially fresh water eutrophication. It is of crucial importance to improve soil nutrient management practices in order to have a positive effect on nutrient use efficiency, crop yield, and the environment. Nutrient balances of different times were calculated for arable soils in a case area. It was shown that positive balances for nitrogen and phosphorus and a negative balance for potassium had lasted for decades. Results of representative soil sampling between 1982 and 1999 show that decades of fertilization at rates exceeding the amount removed by crops have resulted in widespread accumulation of nitrogen and phosphorus in the area. Until recently the soil potassium level had declined due to the insufficient input. Soil pH of most samples also decline and this may be attributed to the over use of chemical fertilizer. Based on the analysis of the characteristics of nutrient budget and soil nutrient dynamics of the area some nutrient management options were proposed in the paper. |
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| Keywords: | Taihu Lake watershed Nutrient balance Nutrient status Nutrient management |
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