摘要
利用1991—2016年3—5月土壤实测含水量资料,采用统计分析方法,从不同土层、不同站点对贵德县春季旱地土壤水分变化特征及其与气象因子的关系进行分析。结果表明,新街、尕让春季土壤含水量变化趋势较一致,最大值出现在5月底,呈低—高缓慢增长;东山土壤含水量波峰出现在4月,呈低—高—低—高的变化。干土层变化与降水量变化呈反向趋势,0~30 cm土壤含水量随深度的增加变化率明显。3月影响土壤含水量主要因子是风速,4月影响土壤含水量的主要因子是风速和温度,5月份影响主要因子是降水量;气候背景是土壤含水量变化的主因;不同的气候条件下各因子对土壤含水量的影响程度和影响时间段不同。
Using the data of soil moisture content from March to May during 1991-2016,the variation characteristics of soil moisture and its relationship with meteorological factors were analyzed from different soil layers and different sites in spring by statistical analysis method. The results showed that the trend of soil moisture content in Xinjie and Garang was consistent,and the maximum appeared at the end of May,showing low-high growth slowly. The peak of soil moisture content of Dongshan appeared in April,showing low-high-low-high changes. The change of dry soil layer and the precipitation trend showed a reverse trend,and the change rate of 0-30 cm soil moisture content was significant with the depth increase. The main factors affecting soil moisture content in March was wind speed. The main factors influencing the soil moisture content in April were wind speed and temperature. The main factors affecting the soil moisture content in May was precipitation. The climate background was the main reason for the change of soil moisture content. The influence degree and influence period of each factor on soil moisture content under different climatic conditions were different.
引文
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