墒情监测站基座埋设对土壤水分分布的影响

发布时间：2018-05-06 20:36

本文选题：墒情监测 + 土壤含水率　；参考：《灌溉排水学报》2017年03期

【摘要】：为确定传感器埋设的合理位置,借助Hydrus-2D软件,对长、宽、高均为50 cm,顶面埋设在地面以下50 cm的基座,结合中国科学院南皮生态农业试验站冬小麦抽穗期的情况,建立了土壤水分运动模型,分别模拟了在有无基座的条件下各时期的土壤体积含水率,并计算了不同条件下因埋设基座而产生的偏差。结果表明,离基座越近,影响越明显。基座的埋设使得其周边土壤雨后的含水率偏大,灌前的含水率偏小。雨后的偏差主要表现在70 cm深度以下的土层,灌前的偏差主要表现在80 cm深度以内的土层。因此,在水平方向与基座的距离不小于70 cm的剖面上埋设传感器,含水率偏差的绝对值均控制在0.02以内,基座对含水率测量的影响可以忽略。
[Abstract]:In order to determine the reasonable position of the sensor, with the help of Hydrus-2D software, the length, width and height of the base are 50 cm, and the top surface is embedded in the base of 50 cm below the ground, combined with the heading date of winter wheat in the Nanpi Eco-agricultural Experimental Station of the Chinese Academy of Sciences. A soil water movement model was established to simulate the soil volume water content in different periods with or without a pedestal, and the deviations caused by the embedding of the base were calculated under different conditions. The results show that the closer the base is, the more obvious the influence is. The soil moisture content of the surrounding soil is larger after rain than that before irrigation. The deviation after rain is mainly in the soil layer below 70 cm depth, and the deviation before irrigation is mainly in the soil layer less than 80 cm depth. Therefore, the absolute value of moisture content deviation is controlled within 0.02, and the influence of the base on moisture content measurement can be neglected because the sensor is embedded on the section of horizontal direction and the distance from the base to the base is not less than 70 cm, and the absolute value of moisture content deviation is controlled within 0.02.
【作者单位】：河海大学水利水电学院;河海大学水文水资源与水利工程科学国家重点实验室;河北省防汛抗旱指挥部办公室;
【基金】：水利部公益性行业科研专项经费项目(201301014)
【分类号】：S152.7

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