| 半干旱地区农田生态系统中硝态氮的淋失 |
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| 引用本文： | 李世清,李生秀.半干旱地区农田生态系统中硝态氮的淋失[J].应用生态学报,2000,11(2):240-242. |
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| 作者姓名： | 李世清 李生秀 |
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| 作者单位： | 西北农业大学资源与环境科学系,陕西杨陵,712100 |
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| 基金项目： | 国家自然科学基金资助项目 !(39770425和39970151) |
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| 摘 要： | 在不同深度的渗漏池、连续６年（１１季作物）研究了半干旱地区农田生态系统中硝态氮的淋失。结果表是，在半干旱地区，硝态氮的淋失仍可发生，淋失量和降水量有密切关系，降水多，淋失量大，不同降水年际间表现出显著差异，氮肥用量决定着淋失量的大小，而屎素和碳酸氢酸淋失量去无林质差异另，不同深度的土壤有着不同的贮水量，因而也有着不同的淋失量，衽夏季休闲，会增加硝态氮淋失的潜在危险。
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| 关 键 词： | 硝态氮淋失 半干旱地区 农田生态系统 |
| 修稿时间： | 1998-09-14 |
Leaching loss of nitrate from semiarid area agroecosystem |
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| LI Shiqing,Li Shengxiu.Leaching loss of nitrate from semiarid area agroecosystem[J].Chinese Journal of Applied Ecology,2000,11(2):240-242. |
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| Authors: | LI Shiqing Li Shengxiu |
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| Institution: | Department of Natural Resources and Environment Science, Northwestern Agricultural University, Yangling 712100. Lisq@public.xa.sn.cn |
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| Abstract: | A 6 years lysimeter experiment shows that an obvious nitrate leaching even occurred in semiarid area agroecosystem.The leaching loss was positively related to precipitation,and had a signficant difference among years with different precipitation.The application rate of N fertilizers determined the amount of leaching loss,but no obvious difference was found between urea and ammonium bicarbonate.Different depth of soil had different water storage,and therefore, had different leached amounts.Summer fallowing could increase the potential nitrate leaching loss. |
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| Keywords: | Nitrate nitrogen Leaching loss Semiarid area |
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