半干旱地区农田生态系统中硝态氮的淋失

应用生态学报 ›› 2000, Vol. 11 ›› Issue (2): 240-242.

半干旱地区农田生态系统中硝态氮的淋失

李世清, 李生秀

西北农业大学资源与环境科学系, 陕西杨陵712100

收稿日期:1998-09-14 修回日期:1998-11-06 发布日期:2000-03-25
通讯作者: 李世清,男,35岁,博士,副教授.现在兰州大学干旱农业生态国家重点实验室进行博士后研究工作.主要从事于氮素在旱地土壤2作物系统中的内循环特征研究,发表相关学术论文30余篇.E-mail:Lisq@public.xa.sn.cn E-mail:Lisq@public.xa.sn.cn
基金资助:
国家自然科学基金资助项目(39770425和39970151)

Leaching loss of nitrate from semiarid area agroecosystem

LI Shiqing, Li Shengxiu

Department of Natural Resources and Environment Science, Northwestern Agricultural University, Yangling 712100

Received:1998-09-14 Revised:1998-11-06 Published:2000-03-25

摘要/Abstract

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.结果表明,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,而尿素和碳酸氢铵的淋失量却无本质差别.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.实行夏季休闲,会增加硝态氮淋失的潜在危险.

关键词: 硝态氮, 淋失, 半干旱地区, 冬小麦, 施氮量, 冠层, 粒叶比, 滴灌

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.

Key words: Nitrate nitrogen, Leaching loss, Semiarid area, grain-leaf ratio., nitrogen application rate, winter wheat, canopy, drip irrigation

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.

LI Shiqing, Li Shengxiu. Leaching loss of nitrate from semiarid area agroecosystem[J]. Chinese Journal of Applied Ecology, 2000, 11(2): 240-242.

参考文献

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