| 三峡库区典型农业小流域土壤系统氮磷收支研究 |
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| 引用本文： | 何仁江,江韬,木志坚,倪九派,魏世强,谢德体.三峡库区典型农业小流域土壤系统氮磷收支研究[J].西南农业大学学报,2011,33(5). |
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| 作者姓名： | 何仁江 江韬 木志坚 倪九派 魏世强 谢德体 |
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| 作者单位： | 西南大学资源环境学院;西南大学三峡库区生态环境教育部重点实验室;重庆市农业资源与环境研究重点实验室; |
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| 基金项目： | 国家科技支撑计划项目(2007BAD87B10) |
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| 摘 要： | 利用三峡库区涪陵段王家沟小流域的农业生产活动调查数据,计算分析了流域农田土壤系统在一个完整的种植年内的氮磷收支状况及循环特征.结果表明,流域农田土壤氮磷平均收入(以纯氮或纯磷计)分别为816和115 kg/(hm2.a),支出分别为462和32 kg/(hm2.a),盈余量分别为354和83 kg/(hm2.a).化肥、作物秸秆还田和人畜排泄物及生活污水是农田土壤系统氮磷的主要输入源,它们对氮素总收入的贡献率分别为72.3%,14.7%和8.1%,对磷素总收入的贡献率分别为82.9%,9.2%和7.4%.作物收获是流域农田土壤系统氮磷输出的主要途径,分别占氮磷总支出的46.2%和98.0%.径流输出分别占氮磷输出的3.5%和2.0%,氮磷化肥径流流失分别占其投入的2.7%和0.7%.在研究流域内的三种主要农业土地利用系统中,榨菜对流域农田土壤氮磷平衡的影响最大,其对氮磷盈余的贡献率分别为61.9%和79.9%;其次为玉米,对氮磷盈余的贡献率分别为32.8%和19.9%;水稻对氮磷平衡的贡献率分别为5.3%和0.2%.因此,合理配施各种来源的肥料、降低旱作系统(榨菜和玉米)土壤的氮磷盈余量是减少流域农业活动对环...
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| 关 键 词： | 农业小流域 三峡库区 氮 磷 平衡 |
Nitrogen and Phosphorus Balance for the Soil Systems in a Typical Small Agricultural Watershed in the Three-Gorges Reservoir Area |
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| HE Ren-jiang,JIANG Tao,MU Zhi-jian,NI Jiu-pai,WEI Shi-qiang,XIE De-ti,.School of Resources , Environment,Southwest University,Chongqing ,China,.Key Laboratory of MOE for Eco-environments in Three-Gorges Reservoir Region,Chongqing ,.Chongqing Key Laboratory of Agricultural Resources , Environment Research.Nitrogen and Phosphorus Balance for the Soil Systems in a Typical Small Agricultural Watershed in the Three-Gorges Reservoir Area[J].Journal of Southwest Agricultural University,2011,33(5). |
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| Authors: | HE Ren-jiang JIANG Tao MU Zhi-jian NI Jiu-pai WEI Shi-qiang XIE De-ti School of Resources Environment Southwest University Chongqing China Key Laboratory of MOE for Eco-environments in Three-Gorges Reservoir Region Chongqing Chongqing Key Laboratory of Agricultural Resources Environment Research |
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| Institution: | HE Ren-jiang1,2,JIANG Tao1,MU Zhi-jian1,3,NI Jiu-pai1,WEI Shi-qiang1,XIE De-ti1,21.School of Resources and Environment,Southwest University,Chongqing 400716,China,2.Key Laboratory of MOE for Eco-environments in Three-Gorges Reservoir Region,Chongqing 400715,3.Chongqing Key Laboratory of Agricultural Resources and Environment Research |
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| Abstract: | |
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| Keywords: | small agriculture watershed Three Gorges reservoir area nitrogen phosphorus balance |
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