紫色土壤氮素不同流失形式的比较研究 |
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作者姓名: | 韩建刚 李占斌 |
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作者单位: | 西北农林科技大学农科院校区资源环境学院,中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室 陕西杨凌712100,陕西杨凌712100西安理工大学,陕西西安710048 |
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基金项目: | 国家自然科学基金项目(40371075),中欧合作研究项目(EROCHiNut-ERBIC18CT980372)共同资助. |
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摘 要: | 土壤氮素流失形式及其量化研究是农业小流域氮素管理及流失过程模拟的核心内容之一,以紫色土区3个具有不同地形和土地利用方式的典型农业小流域为研究对象,比较研究了区域土壤氮素在降雨侵蚀过程中流失的主要形式。结果表明,紫色土区土壤氮素以硝态氮为主要流失形式,其流失浓度一般占硝态氮和铵态氮总浓度的80%以上,农田利用为主流域的则高达90%以上。氮素流失的平均浓度因流域土地利用类型的差异而显著不同,农田的一般为(5.36±2.13)mg/L,而非农田利用的变化在1.70~3.15mg/L之间。农田硝态氮的精确管理应作为减控流域土壤氮素非点源流失的关键措施。
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关 键 词: | 紫色土 硝态氮 铵态氮 流失 |
Comparative Study of N loss form by Runoff in Purple Soil Agro-watersheds |
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Authors: | Han Jiangang Li Zhanbin |
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Institution: | (1 College of Resources and Environment Science, Northwestern Sci-tech University of Agriculture & Forestry, Yang ling
712100, ShaanXi Province; 2 State Key Laboratory of Soil Erosion and Dry land Farming on the Loess Plateau,
Institute of Water and Soi |
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Abstract: | The objective of this paper was to investigate and quantify the main form of N loss by runoff, and finally to serve for the N management and loss simulation. Three agro-watersheds with different land use type and terrain were taken examples to investigate the main form of N loss by runoff under erosion of natural rainfalls in purple soil region. Results showed that nitrate nitrogen was the main form of N loss by runoff. Generally, nitrate nitrogen concentration in runoff accounted for 80 percent of N loss, even above 90 percent in farmland-dominated watersheds. In addition, the average concentration of N loss was (5.36±2.13) mg/l in farmland-dominated watersheds, while behaving from 1.70 to 3.15 mg/l in woodland-dominated watersheds and watersheds with various landscape structures. This showed that precise management of nitrate nitrogen in farmland-dominated watersheds was a key practice for control and reduction of agricultural non-point source N loss. |
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Keywords: | Purple soil Nitrate nitrogen Ammonium nitrogen Loss by runoff |
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