【摘要】 利用河北省26个农业气象观测站1996~2007年土壤水分逐旬观测资料,分析了河北省土壤水分物理常数分布特征,土壤相对湿度的时空分布特征及其受降水量、蒸发量的影响。结果表明:土壤凋萎系数、田间持水量由西北高原地区向东南平原增加,土壤容重自西北高原地区向东南平原地区减小,随深度略有增大;土壤相对湿度由西北高原地区向东南平原地区增大,随土壤深度增加而增大;土壤相对湿度春末夏初最小,秋冬季最大;降水量多,蒸发量小的年份土壤相对湿度较大,降水量小,蒸发量大的年份土壤相对湿度较小。更多还原

【Abstract】 Using the soil moistures data of 26 agriculture weather station of Hebei Province in 1996~2007,we analyzed the soil moisture physical constants distribution characteristics,the soil relative humidity space and time distribution characteristics.The soil relative humidity is affected by evaporation and precipitation.The result indicated that wilting coefficient and field capacity of soil increase from the north-west high altitude to south-east plains increase,the soil bulk density decrease from the north-west high altitude to south-east plains reduces,and increase with depth.The soil relative humidity increase from the north-west high altitude to south-east plains,and increase with depth.In late spring and early summer the soil relative humidity value is smaller,in autumn and winter the soil relative humidity value is larger.Larger precipitation and smaller evaporation are related with the larger soil relative humidity value.Smaller precipitation and larger evaporation are related with the smaller soil relative humidity value.更多还原