裸岩石砾地覆土厚度对土壤水分的影响

覆土厚度与土壤水分的关系密切,直接影响到土地的整治与利用效果。设置一试验小区,在分析土壤水分的时间动态分布特征及空间变化特征的基础上,研究了裸岩石砾地不同覆土厚度对土壤水分的影响。结果表明:覆土厚度在50 cm以内时,土壤水分的时间变异性较大,土壤水分随土层深度的增加而增加,覆土厚度对表层土壤水分含量影响较大;覆土厚度超过50 cm后,土壤水分含量相对稳定,时间变异性较小,土壤水分随土层深度的增加呈先增大后减小趋势,表层土壤水分含量变化不大。通过分析得出,为保障土壤水分含量,在裸岩石砾地整治中,覆土厚度不宜小于50 cm,研究成果为类似地区土地整治中覆土厚度的确定提供了一定的理论依据。

Effects of covering soil thickness of bare rock gravel land on soil moisture

Soil moisture is heavily dependent on the covering soil thickness, and it directly affects the land regulation and utilization. By setting up a filed plot experiment, and based on the temporal dynamic distribution characteristics of soil moisture and its spatial variation features, the effect of covering soil thickness on soil moisture was studied. The results show that the temporal variability of soil moisture is large when soil thickness is less than 0.5 m, and soil moisture is greatly influenced by soil thickness, so soil gets more moisture as soil depth increases. When soil thickness exceeds 0.5 meter, soil moisture remains relatively stable with smaller temporal variability, and the soil moisture experiences an increase to a decrease when soil thickness increases. In order to ensure a certain level of soil moisture, covering soil thickness should be controlled to a lower limit of 0.5 m when regulating bare rock gravel land.