表层土壤水分动态规律研究

Study on Dynamic Law of Surface Soil Moisture

基于高频广域的土壤水分实测数据集,提取不同降水强度以及非降水情况下样本,利用同期平均法及曲线拟合方法,量化5 cm深度下土壤水分动态变化规律。主要发现有以下几点:1)高强度降水后短时间内土壤水分消退速率明显高于低强度降水,且达到稳定所需时间也明显较长。2)一天中土壤水分最高点位于0点,最低点为14点左右。3)常态下土壤水分会在0—0.005 m^(3)/m^(3)区间内变化,日均降低0.003 m^(3)/m^(3)。本次研究形成了表层土壤水分动态变化的一般性规律,对相关的动态模拟与研究具有重要参考价值。

Based on the high-frequency and wide-area soil moisture measurement dataset,samples of different precipitation intensities and non-precipitation conditions were extracted,and the dynamic change of soil moisture at a depth of 5 cm was quantified by using the mean-time averaging method and curve fitting method.The following points were mainly found:(1)The soil moisture retreat rate was significantly higher than that of low-intensity precipitation in a short period of time after high-intensity precipitation,and the time required to achieve stability was also significantly longer.(2)The highest point of soil moisture in the day is 0:00 on the day,and the lowest point is about 14:00.(3)Under normal conditions,soil moisture will change within the range of 0—0.005 m^(3)/m^(3),and the average daily decrease will be 0.003 m^(3)/m^(3).This study forms a general law of dynamic changes in surface soil moisture,which has important reference value for related dynamic simulation and research.