Monitoring soil water content for decision supporting in agricultural water management based on critical threshold values adopted for Andosol in the temperate monsoon climate
Monitoring soil water content for decision supporting in agricultural water management based on critical threshold values adopted for Andosol in the temperate monsoon climate
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DOI：
10.1016/j.agwat.2019.105930
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发表时间：
2020-02
影响因子：
6.7
通讯作者：
K. Kassaye;J. Boulange;V. Lam;H. Saito;Hirozumi Watanabe
中科院分区：
文献类型：
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作者：
K. Kassaye;J. Boulange;V. Lam;H. Saito;Hirozumi Watanabe
将土壤含水量保持在现有范围内是作物生产和用水的最佳选择。因此，持续监测土壤含水量是确定可持续农业用水管理关键参数的关键因素。本研究对东京农工大学坂内试验田（Sakaecho experiment field of Tokyo Agriculture and Technology）的土壤体积含水量（θv）进行了监测和分析。2016年6月至2017年9月，使用电容传感器（CS）监测了由火山灰土壤组成的场地。植物吸收有效水的最佳范围被定义为田间持水量和耗竭水平之间的范围（θDep）。16个月的监测结果表明，θvin随降雨、蒸发和深层渗漏的变化具有明显的时间变异性。在整个监测期间，10-20和20-30 cm土层的θ v监测值均高于θDep（在吸力（pF）值为3.0时测得的0.307 cm 3cm − 3）。而表层土壤（0-10 cm）由于蒸发量大、渗透深，在27%的监测时段内，尽管降雨量很大，但θ v低于θ Deprets，表明需要进行连续的θ v监测。支持规划有效灌溉水管理的决策，以避免浅根作物和深根作物的产量损失，生根作物在其最早的生长阶段，以及质量下降，由于水分胁迫。
Maintaining soil water content within the readily available range is optimum concerning crop production and water use. In this regard, the continuous monitoring of soil water content is a crucial element for identifying the key parameters for sustainable agricultural water management.In this study, volumetric soil water content (θv) was monitored and analyzed in a bare soil agricultural field (Sakaecho experimental field of Tokyo University of Agriculture and Technology). The field consisting of volcanic ash soils was monitored from June 2016 to September 2017 using capacitance sensor (CS). The optimal range of readily available water for plant uptake was defined as the range between field capacity and depletion level (θDep). These values were determined from the soil water potentials andθvvalues measured using pressure plate and soil cores, respectively.The 16-month period monitoring result revealed substantial temporal variability inθvin response to rainfall, evaporation and deep percolation. The monitored values ofθvwere above theθDep(0.307 cm3cm−3measured at suction (pF) value of 3.0) throughout the monitoring period for the 10–20 and 20–30 cm soil layers. In contrast, for the surface soil (0–10 cm), theθvfell belowθDepfor 27% of the monitoring period despite the high rainfall during those periods owing to high evaporation and deep percolation.The belowθDepresults for the surface soil suggests the need to conduct continuousθvmonitoring, to support decision for planning efficient irrigation water management to avoid yield loss of shallow-rooted crops and deep-rooted crops at their earliest growth stages as well as quality reductions due to moisture stresses.