Two-dimensional numerical simulations of soil-water and heat flow in a rainfed soybean field under plastic mulching
Two-dimensional numerical simulations of soil-water and heat flow in a rainfed soybean field under plastic mulching
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DOI：
10.2166/ws.2021.095
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发表时间：
2021-03
期刊：
影响因子：
1.7
通讯作者：
M. A. Kader;K. Nakamura;M. Senge;M. Mojid
中科院分区：
文献类型：
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作者：
M. A. Kader;K. Nakamura;M. Senge;M. Mojid
数值模拟可以帮助理解通过覆膜土壤的水和热流系统。有效的模拟方法对于了解地膜在土壤生态系统中的作用是至关重要的，它可以节约农业用水。通过在岐阜大学旱作大豆覆膜和裸土处理的田间试验，探讨了土壤水热流机制。利用二维数值软件hydrus - 2d模型，在土壤表面设置不同边界，模拟水热流。首先利用室内实测数据，采用反解法估算土壤水力参数，然后采用反解法优化土壤热参数，模拟土壤-水-热流耦合。HYDRUS-2D模型较好地模拟了通过根区深度的水和热流。土壤湿度的均方根误差（RMSE）分别为0.015 ~ 0.030、0.046 ~ 0.055 cm3 cm−3，土壤温度的均方根误差分别为0.66 ~ 1.28℃、0.70 ~ 1.54℃。地膜覆盖土壤水分入渗比裸地低61%，减少了土壤蒸发量和土壤水分储存变化。本研究可用于旱作作物不同覆盖方式的设计与管理。
Numerical simulation can help understanding water- and heat-flow systems through plastic-mulched soils. An effective simulation approach is crucial to know the role of plastic mulch in a soil ecosystem, which can save water in agriculture. A field experiment was conducted at Gifu University in a rainfed soybean cultivation under plastic mulch and bare soil treatments to clarify the soil water and heat flow mechanism. Furthermore, the two-dimensional numerical software HYDRSUS-2D model with different boundaries at the soil surface was used to simulate water and heat flows. Firstly, soil hydraulic parameters were estimated by inverse solution using laboratory-measured data and then coupled soil-water and heat flows were simulated by optimizing soil thermal parameters by inverse solution. The HYDRUS-2D model simulated water and heat flow through the root zone depths satisfactorily. The root-mean square error (RMSE) was 0.015–0.030, and 0.046–0.055 cm3 cm−3 for the plastic mulch, and bare soil, respectively, in estimating soil moisture and 0.66–1.28, and 0.70–1.54 °C, respectively in estimating soil temperature. Water infiltration was 61% lower in the plastic-mulched soil, which reduced soil evaporation as well as soil-moisture storage changes compared to bare soil. This study can be applied to design and manage different plastic mulching patterns in rain-fed crop cultivation.