论文部分内容阅读
土壤水分是植物赖以生长和利用各种土壤元素的溶剂,一般用土壤含水率表示(即土壤水分占土壤干重的百分数)。但为了真正了解植物对土壤水分需求的指标,还必须研究土壤的有效含水率。土壤有效含水率的计算方法是:土壤有效含水率(％)=土壤含水率-土壤凋萎系数从而可知,要确知土壤有效含水率,一定要测定土壤凋萎系数。1979～1981年我们在盐池县城郊长城大队的干旱沙地上,结合万亩林的建设,对有代表性的土壤进行了凋萎系数的测定。
Soil moisture is the solvent that plants use to grow and utilize various soil elements. It is generally expressed in terms of soil moisture content (ie, the percentage of soil moisture to soil dry weight). However, in order to truly understand the plant’s requirement for soil moisture, it is also necessary to study the soil’s effective moisture content. Effective soil water content is calculated as: effective soil water content (%) = soil water content - soil wilting coefficient Thus we can see that to determine the soil effective moisture content, we must determine the soil wilting coefficient. From 1979 to 1981, we measured the wilting coefficient of representative soils on the arid sand of the Great Wall Brigade in the suburbs of Yanchi County in combination with the construction of 10,000 mu of forest.