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施肥与植被覆盖对坡地铵态氮流失的影响
作者: 梁 丽1  2  赵 梅3  
单位: (1中国科学院水利部、西北农林科技大学水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点试验室  陕西 杨凌 712100;2 内蒙古大唐国际克旗煤制天然气有限责任公司  内蒙古 赤峰 025350;3 北京师范大学地理学与遥感科学学院  北京 100875)  
关键词: 铵态氮  流失  氮肥  植被覆盖  坡地  
分类号:S157
出版年,卷(期):页码:2012 ,43 ( 12 ): 页码:1986-1990
摘要:

【Objective】This research studied and clarified the influential effects of different nitrogen fertilizers and vegetation coverage on NH4+-N runoff in slope soil over Loess Plateau. 【Method】Under the conditions of simulated rainfall, experiments were conducted with gradient-adjusted sheet scour tanks to study the NH4+-N runoff character on slope soil and the impacts of slope gradient, vegetation coverage, and foreigner nitrogen fertilizer on NH4+-N runoff in slope soil. 【Result】NH4+-N concentration decreased with surface runoff after NH4+-N application in soil; the NH4+-N concentration mainly lessened with sediment losses with only few NH4+-N infiltration into the soil. Application of NH4NO3 could increase the NH4+-N loss in soil. Vegetation coverage reduced the NH4+-N loss with sediment runoff but increased the NH4+-N loss with added-nitrogen water runoff. 【Conclusion】The application of nitrogen fertilizer or plant vegetation will aggravate the NH4+-N loss on soil slope, which was harmful to the local ecological environment.

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