摘要
利用濉溪县0～50cm土层土壤含水量和同期降水量、蒸发量资料分析表明，土壤水分的主要活动层在耕层，不同层次土壤含水量之间存在极显著的正相关。土壤含水量增减与期间降水量、蒸发量呈直线相关关系，耕层土壤含水量变化和报告期与基期的比值均与湿润系数呈极显著正相关。0～30cm不同层次土壤相对含水量低于50％时，需降水或补充灌溉13．6～39．0cm方可使耕层相对含水量达到80％。当湿润系数为0．47时，耕层土壤含水量可以维持在基期水平。耕层土壤含水量蒸减呈“快-缓慢-滞缓”的变化过程，蒸减速率随土壤含水量的变化可用指数曲线拟合。使耕层相对含水量达到80％以上的一次降水过后，连续10．7～38．3d无降水，耕层相对含水量尚可维持在60％以上。
The material of 0 - 50 cm soil layer soil moisture content and the same time precipitation, the transpiration rate of the Suixi County was analyzed. The results indicated that, soil moisture main active layer was topsoil, between the different level soil moisture content had the extremely remarkable correlation. The soil moisture content fluctuation and the period precipitation, the transpiration rate assumed the straight line correlation relations. The topsoil soil moisture content change and the current period and the base period ratio and the moist coefficient assumes extremely obviously was being connected. Needs the precipitation or the supplement irrigates 13.6- 39.0 mm only then to enable the topsoil relative water content to achieve 80%. When the moist coefficient was 0.47, The topsoil soil moisture content should maintain at the base period level. The topsoil soil moisture content steams reduced assumes ＂quickly - slow - slow＂ the change process, Steams the rate of deceleration along with the soil moisture content change available exponential curve fitting. While the topsoil relative water content to achieve 80% above a precipitation, continuously 10.7 - 38.3 d non- precipitation topsoil relative water content still permissible maintenance above 60%.
出处
《中国土壤与肥料》
CAS
CSCD
北大核心
2007年第6期23-27,共5页
Soil and Fertilizer Sciences in China
关键词
土壤含水量
降水量
蒸发量
相关分析
soil moisture content
precipitation
transpiration rote
correlation analysis
