Simulated effects of texture and rooting depth on soil moisture sensor placement
FAN Jun, WANG Quan-Jiu, WANG Yu-Ning
(1.State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A＆F University, Yangling, Shaanxi 712100，China； 2.Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China)
Abstract：Soil water dynamics and balance under various rooting depth and soil texture were simulated by the Hydrus-1D model to investigate the effects of soil texture and rooting depth on sensor depth in soil profile, and the simulated results were validated by experimental efforts. It is concluded that the soil texture and distribution of plant root has significant influence on the sensor depth. Soil moisture sensor should be buried at 5 cm under sand soil for plants with shallow roots (10 cm), while those should be buried at 20 cm depth for rooting depth of 30 cm.As for loam soil, sensor placement locates in the one third to two third rooting depth is best. Shallow sensor placement could increase irrigation frequency and deep sensor placement could results in plant water stress. The complex results were achieved under fine soil and plants with deep roots, therefore, field observation should be done for the buried depth of sensor in soil profile. In conclusion, it is useful to guide sensor placement by simulation for sand and loam soil, but it is not suitable for clay soil. Optimum sensor placement should be adjusted according to plant water requirement which affected by plant species. More detailed researches should be focused on the situations that sensor buried depth affected by nonuniform irrigation and temporal and spatial variations of plant roots.
樊军, 王全九, 汪羽宁. 质地和根系深度对水分探头埋设的仿真模拟[J]. 排灌机械工程学报, 2013, 31(1): 70-74.
FAN Jun, WANG Quan-Jiu, WANG Yu-Ning. Simulated effects of texture and rooting depth on soil moisture sensor placement. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(1): 70-74.
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