Application of the DNDC model to estimate N2O emissions under different types of irrigation in vineyards in Ningxia, China
Application of the DNDC model to estimate N2O emissions under different types of irrigation in vineyards in Ningxia, China
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DOI：
10.1016/j.agwat.2015.10.006
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发表时间：
2016
影响因子：
6.7
通讯作者：
Yajie Zhang;Haishan Niu;Shiping Wang;Kun Xu;Rui Wang
中科院分区：
文献类型：
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作者：
Yajie Zhang;Haishan Niu;Shiping Wang;Kun Xu;Rui Wang
沟灌是宁夏回族自治区葡萄园最常见的做法，可以将固体肥料溶解在灌溉水中，与施肥结合起来，一些地区还采用了滴灌和滴灌施肥。这些灌溉方法及其相应的施肥方案可能会影响土壤中一氧化二氮 (N2O) 的排放。因此，使用模型来模拟 N2O 排放差异并确定限制 N2O 排放的农田管理方法非常重要。在2012年7月至8月和2013年7月至9月的生长季中，利用宁夏银川永宁玉泉营葡萄园的N2O排放实验数据对反硝化分解（DNDC）模型进行了测试。经过模型验证，2012年和2013年沟灌和滴灌之间的模拟排放差异分别为9.86±0.845和0.966±0.464kgha−1a−1。因此，2012年和2013年排放量分别减少了约72.5%和52.4%。在区域模拟中，宁夏自治区葡萄园由沟灌改为滴灌后，年N2O减排量的全球变暖潜能值（GWP）达到27,749,760 ± 5,489,160 kg CO2当量。总之，DNDC 模型被证明是解决葡萄园替代管理实践有效性的有力工具，它表明采用滴灌系统而不是传统的沟灌系统可以减少 N2O 排放。
Furrow irrigation, which can be combined with fertilisation by dissolving solid fertilisers in irrigation water, is the most common practice in vineyards in the Ningxia Hui Autonomous Region, and drip irrigation and fertigation have been employed in some areas. These irrigation methods and their corresponding fertilisation schemes may affect nitrous oxide (N2O) emissions from the soil. Therefore, it is important to use a model to simulate differences in N2O emissions and identify farmland management methods that limit N2O emissions. During the July–August 2012 and July–September 2013 growing seasons, the denitrification and decomposition (DNDC) model was tested against experimental N2O emissions data from vineyards in Yuquanying, Yongning, Yinchuan, Ningxia. After model validation, the simulated differences in emissions between furrow irrigation and drip irrigation were 9.86 ± 0.845 and 0.966 ± 0.464 kg ha−1a−1in 2012 and 2013, respectively. Thus, the emissions were reduced by approximately 72.5% and 52.4% in 2012 and 2013. In the regional simulation, the Global Warming Potential (GWP) of the annual N2O emission reductions reached 27,749,760 ± 5,489,160 kg CO2-equivalents after the vineyards in the Ningxia Autonomous Region were converted from furrow irrigation to drip irrigation. In conclusion, the DNDC model, which proved to be a powerful tool for addressing the efficacy of alternative management practices in vineyards, revealed that N2O emissions can be reduced by adopting drip irrigation systems rather than traditional furrow irrigation systems.