紫色土区小流域不同土地利用类型非点源氮迁移特征
Transport Characteristics of Nitrogen on Different Land-uses Patterns in the Hilly Area of Purple Soil
查看参考文献14篇
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文摘
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通过对紫色土区小流域旱地、居民点氮迁移过程的野外监测,研究紫色土区旱地、居民点氮流失特征。结果表明,地表径流是居民点氮迁移的主要途径,而旱地氮素主要通过壤中流迁移。次降雨事件中居民点氮迁移浓度、负荷变化显著,总氮(TN)、颗粒态氮(PN)、铵氮(AN)迁移呈现显著的"初始冲刷效应",初期25.0%的径流量携带了37.0%的TN负荷、60.0%的PN负荷和36.0%的AN负荷,而旱地径流中氮浓度、负荷变化较小。居民点氮流失与降雨量密切相关,旱地氮流失则集中在施肥后初期降水事件。旱地、居民点是紫色土区小流域氮流失的主要"源",其中旱地、居民点径流中TN年内浓度分别为16.43,14.68mg/L,TN年内流失负荷分别为41.18,222.05kg/hm~2。 |
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其他语种文摘
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Long-term plot experiments on runoff at field scale were performed to monitor nitrogen transport from the upland and residential area in the hilly area of purple soil.Results showed that the runoff processes affected the nitrogen transport deeply from upland and residential area.Nitrogen loss via surface flow was the main route of nitrate loss from residential area.In contrast,nitrogen mainly was transported by the interflow in upland.At single rainfall event duration,great temporal variations in nitrogen concentration and loading distribution were observed in residential area which exhibited a strong“first flush”of total nitrogen (TN),particulate nitrogen(PN),and ammonia nitrogen(AN),the mass loadings proportions of 37.0% TN, 60.0% PN and 36.0% AN,respectively,were delivered within the first 25.0% of the runoff volume.In contrast,small variations in nitrogen concentration and loading distribution were observed for upland.The liner regression analysis showed that the nitrogen loss in residential area was clearly correlated with the precipitation,and nitrogen loss from upland was concentrated at the initial rainfall events after the input of N fertilizer.The results showed that the residential area and upland were the most important“hotspot”of diffuse pollution in the catchment,the TN concentration in 2011were 16.43mg/L and 14.68mg/L for upland and residential area,respectively,and the loss rate of TN from upland and residential area were 41.18 kg/hm~2 and 222.05kg/hm~2,respectively.The treatments need to be focused more closely on the residential area and upland at the initial period of runoff and the initial rainfall events after the input of N fertilizer, respectively. |
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来源
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水土保持学报
,2013,27(2):71-75,79 【核心库】
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关键词
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紫色土区
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旱地
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居民点
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氮流失
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氮浓度
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氮负荷
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地址
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1.
中国科学院成都山地灾害与环境研究所, 成都, 610041
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河南理工大学测绘与国土信息工程学院, 河南, 焦作, 454003
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1009-2242 |
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学科
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农业基础科学 |
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基金
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国家973计划
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文献收藏号
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CSCD:4841222
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