Calibration of DNDC model for nitrate leaching from an intensively cultivated region of Northern China

文献类型： 外文期刊

第一作者： Li, Hu

作者： Li, Hu;Wang, Ligang;Qiu, Jianjun;Gao, Maofang;Gao, Chunyun;Li, Hu;Wang, Ligang;Qiu, Jianjun;Gao, Maofang;Gao, Chunyun;Li, Hu;Wang, Ligang;Qiu, Jianjun;Gao, Maofang;Gao, Chunyun;Li, Changsheng

作者机构：

关键词： Nitrate leaching;Soil water dynamics;DNDC model;Model evaluation;Sensitivity test;Uncertainties

期刊名称：GEODERMA （ 影响因子：6.114； 五年影响因子：6.183 ）

ISSN： 0016-7061

年卷期： 2014 年 223 卷

页码：

收录情况： SCI

摘要： Nitrogen (N) loss through nitrate leaching in arable cropping systems in China has been recognized as one of the most common agricultural sources of groundwater contamination. The Denitrification-Decomposition or DNDC model, equipped with detailed soil hydrological and biogeochemical processes, was adopted in the study to quantify nitrate leaching for an intensively cultivated region in northern China. Several key parameters embedded in DNDC were calibrated against leaching data measured at a typical field with winter wheat-corn rotation within the target domain region. Five more sites representing the predominant cropping systems in the study region were selected for validating the modified model. In comparison with the original version of DNDC, the revised version yielded better results in simulated soil water and N leaching losses. To upscale the model simulation to regional level, we linked the validated DNDC to a regional database containing meteorological data, soil properties, vegetation types, and management practices for the target domain. Results from the regional simulation indicated that the total potential nitrate leaching load from the simulated 16.31 million ha croplands (sown area) ranged from 1.5 to 2.15 Tg N per year, with an average of 1.8 Tg N, which was equivalent to 26.1% of the total amount of N fertilizer applied in the region in 2009. The modeled results showed clear spatial patterns of nitrate leaching rates across the region due to the spatially differentiated fertilizer application rates as well as the soil water regimes. Alternative water management practices were suggested to effectively reduce nitrate leaching losses from the agricultural region in northern China. (C) 2014 Elsevier B.V. All rights reserved.

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