沧州市土壤墒情变化规律研究

依据沧州市捷地旱情试验站2003~2014年监测资料,深入分析了沧州地区土壤墒情特点,研究了捷地试验站所代表区域(滨海平原区)的土壤墒情变化规律。采用实际观测资料,分析计算土壤消退系数K值,并求出逐月平均K值,建立退墒预报方案。构建P-θ_0-△θ组合图,即建立降雨量、雨前土壤含水率、雨后增墒的相关关系,由此分析得到土壤墒情增加的相关公式,进而可以较为准确地对未来墒情增加进行预报。通过2015年实测资料验证,比较增退墒方案以及经全面评定,其精度可以满足本地区墒情预报的要求。该成果对合理利用水资源,合理指导农作生产,促进水资源可持续发展,具有重要的现实意义。

Studying on Soil Moisture Content Change in Cangzhou

Based on the monitored data at the Jiedi station during 2003-2015, this paper analyzed the characteristics of the soil moisture in Cangzhou Region, and studied the law of the soil moisture change. Using the observed data, this paper also calculated the soil depletion coefficient K, obtained the monthly average value of K, and made a plan of soil moisture forecast plan. The correlation between the rainfall, soil moisture content before raining and soil moisture increase after raining was established to obtain the formula for increase of the soil moisture, so as to make correct forecasting. By verifying the observed data in 2015, the forecast plans of soil moisture depletion and soil moisture increase were evaluated, of which the precision can meet the requirement of the soil moisture forecasting in Cangzhou Region.