若干土壤湿度观测方法的研究

THE EXPERIMENT OF SOME METHODS ON SOIL MOISTURE MEASURE

在全国不同气候地区15个站设置了自然矮草植被和作物两种土壤湿度观测地段,并于1985～1986年进行了对比观测,结果表明,可以通过自然矮草地段的土壤贮水量估算作物地段的土壤贮水量,自然矮草地段可作为土壤温度"本底"观测地段。统计实测土壤湿度资料表明:土壤湿度观测重复次数应不少于4次,0～100cm 土层年土壤贮水量高于310mm 的地区,土壤湿度测定深度至50cm 已足够,地下水位高于3m 的地区必须测定地下水位。

On the basis of control experiment of soil moisture measure conducted in the low-growing plant cover and crop field in different kind of climate-soil in the whole country,the necessity and feasibility locating soil moisture ground measure stations are proved.The results of analysis for expe- rimental data show that:the repeat times of soil moisture measure should not be less than 4 times;in the measure sections where the soil moisture contents (0-100 cm of soil layer)are over and above 310 mm,the 50 cm depth of soil moisture measure is enough;in the sections where the depth of groundwater level is less than 3 meters,the groundwater level must be measured.The sugges- tions on the statistical methods of soil moisture data and the designs for forms are made.