Simulating Crop Evapotranspiration Response under Different Planting Scenarios by Modified SWAT Model in an Irrigation District, Northwest China.
Simulating Crop Evapotranspiration Response under Different Planting Scenarios by Modified SWAT Model in an Irrigation District, Northwest China.
复制标题
西北某灌区改良SWAT模型模拟不同种植情景下作物蒸散响应
DOI：
10.1371/journal.pone.0139839
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Singh VP
中科院分区：
文献类型：
--
作者：
Liu X;Wang S;Xue H;Singh VP
模拟灌区不同种植情景下作物蒸散量对优化作物种植模式、解决农业缺水问题和促进水资源可持续利用具有重要意义。通过对SWAT模型中蒸散量模块的改造，对SWAT模型进行了改进。并将改进后的模型应用于西北清苑灌区的实际工程中。以土地利用、土壤、气象、灌溉制度和作物系数为输入数据，根据DEM和当地渠系对灌区进行分区。在模型标定和验证的基础上，改进后的模型比原模型具有更好的模拟效率。利用改进后的模型模拟了灌区不同种植情景下作物蒸散的响应。结果表明，在保持总耕地面积不变的前提下，减少春小麦和夏玉米种植比例（情景1和情景2），作物蒸散量分别减少了2.94%和6.01%。然而，总净产值在不同的情景下呈现相反的趋势。与目前的情况相比，情景1下的价值下降了3.28%，而情景2下的价值增加了7.79%。基于SWAT模型，提出了一种估算不同种植情景下作物腾发量响应的新方法，并通过研究西北灌区种植情景变化对作物腾发量和产值的影响，为合理利用水资源和发展当地经济的农业水资源战略管理规划提供建议。
Modelling crop evapotranspiration (ET) response to different planting scenarios in an irrigation district plays a significant role in optimizing crop planting patterns, resolving agricultural water scarcity and facilitating the sustainable use of water resources. In this study, the SWAT model was improved by transforming the evapotranspiration module. Then, the improved model was applied in Qingyuan Irrigation District of northwest China as a case study. Land use, soil, meteorology, irrigation scheduling and crop coefficient were considered as input data, and the irrigation district was divided into subdivisions based on the DEM and local canal systems. On the basis of model calibration and verification, the improved model showed better simulation efficiency than did the original model. Therefore, the improved model was used to simulate the crop evapotranspiration response under different planting scenarios in the irrigation district. Results indicated that crop evapotranspiration decreased by 2.94% and 6.01% under the scenarios of reducing the planting proportion of spring wheat (scenario 1) and summer maize (scenario 2) by keeping the total cultivated area unchanged. However, the total net output values presented an opposite trend under different scenarios. The values decreased by 3.28% under scenario 1, while it increased by 7.79% under scenario 2, compared with the current situation. This study presents a novel method to estimate crop evapotranspiration response under different planting scenarios using the SWAT model, and makes recommendations for strategic agricultural water management planning for the rational utilization of water resources and development of local economy by studying the impact of planting scenario changes on crop evapotranspiration and output values in the irrigation district of northwest China.