| 不同施氮水平下深层土壤硝态氮淋失特征研究 |
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| 作者姓名： | 付玉芹 雷玉平 郑 力 耿清国 |
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| 作者单位： | 中科院遗传与发育生物学研究所农业资源研究中心，中国科学院研究生院 北京100039，中科院遗传与发育生物学研究所农业资源研究中心，中科院遗传与发育生物学研究所农业资源研究中心，中科院遗传与发育生物学研究所农业资源研究中心，河北石家庄050021，河北石家庄050021，河北石家庄050021，河北石家庄050021 |
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| 基金项目： | 中国科学院知识创新工程项目;中国科学院资助项目 |
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| 摘 要： | 通过GeoprobeR深层取土18m,分析了不同施氮水平下厚不饱和层土壤中NO3--N的迁移变化。发现不同施氮处理下NO3--N在一个生育期的淋失变化主要体现在0～4m土体内,土壤中硝态氮累积峰下移深度为0.2～0.6m,高施肥土体中,深层土壤6.7～8m和13～15m土体中也有少量硝态氮淋失,施氮量越高,淋失量和累积量也越高;不同施肥处理下,厚不饱和层土壤中NO3--N累积量变化主要体现4m土体特别是根区土层中,在2m土体内,土体中NO3--N的累积量与施入的氮肥量呈极显著线性关系,根区以下不饱和层中NO3--N累积量超过1800kg/hm2。
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| 关 键 词： | 厚不饱和层 氮淋失 硝态氮 地下水 |
Nitrate Leaching Characteristics in Deep Soil Layer for Different Fertilization Methods |
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| Authors: | Fu Yuqin Lei Yuping Zheng Li Geng Qingguo |
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| Institution: | 1. Center for Agricultural Resources Research, institute of genetic and developmental Biolosy, CAS, Shijiazhuang 050021; 2.The Graduate school of the Chinese Academy of Science, Beijing 100039 |
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| Abstract: | Nitrate leaching in deep unsaturated zone was studied by getting 18 meters soil samples. The result show: nitrate leaching in different fertilizer treatment mainly occurred in 0~-4 meter soil layers, the place of nitrate peak went down 0.2~0.6 meters, in high fertilizing field, nitrate leaching was also found in 6.7~8 and 13~15 meters, the more fertilizer used, the more leaching and accumulated nitrate were found in soil profile; Variability of accumulated nitrate in deep unsaturated zone were only found in 4 meter soil profile, especially in root zone soil layer, accumulated nitrate was linear with fertilization, more than 1800 kg/hm2 nitrate were accumulated in the unsaturated zone under root zone. |
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| Keywords: | Geoprobe |
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