Exploring impacts of vegetated buffer strips on nitrogen cycling using a spatially explicit hydro-biogeochemical modeling approach
Exploring impacts of vegetated buffer strips on nitrogen cycling using a spatially explicit hydro-biogeochemical modeling approach
复制标题
使用空间明确的水文生物地球化学建模方法探索植被缓冲带对氮循环的影响
DOI：
10.1016/j.envsoft.2016.12.002
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
K. Butterbach-Bahl
中科院分区：
文献类型：
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作者：
S. Klatt;D. Kraus;P. Kraft;L. Breuer;M. Wlotzka;V. Heuveline;E. Haas;R. Kiese;K. Butterbach-Bahl
农业已被认为是环境中氮过剩负荷的主要人为来源。硝酸盐通过地下途径的流失严重威胁着地下水和地表沃茨。本研究探讨了耦合水文地球化学空间显式模型的能力，模拟农业土壤中的氮循环和相关的命运过量硝酸盐垂直和横向位移对水体。研究了不同植被缓冲带（VBS）对硝态氮的截留能力及其对N2O和N2排放的影响. VBS通过反硝化作用去除硝酸盐的有效性在很大程度上取决于土壤特性和水文流动路径。模拟N2排放量从VBS与高土壤水分的VBS相比，地下水位低的20倍。没有VBS的模拟河水硝酸盐浓度为3.7 mg NO 3− l− 1，在20 m VBS下降低至0.1 mg NO 3− l− 1。
Agriculture has been recognized as a major anthropogenic source of surplus loads of nitrogen in the environment. Losses of nitrate via subsurface pathways are severely threatening groundwater and surface waters. This study explored the capability of a coupled hydro-biogeochemical spatially explicit model, simulating nitrogen cycling in agricultural soils and the associated fate of excess nitrate subjected to vertical and lateral displacement towards water bodies. Different vegetated buffer strips (VBS) were tested for their nitrate retention capability and impacts on N 2 O and N 2 emissions. The effectiveness of a VBS to remove nitrate by denitrification strongly depends on soil characteristics and hydrological flow paths. Simulated N 2 emissions from VBS with high soil moisture were up to twenty-fold compared to VBS where groundwater levels were low. Simulated streamwater nitrate concentrations without VBS were 3.7 mg NO 3− l− 1 and showed a decrease to 0.1 mg NO 3− l− 1 for a 20 m VBS.