论文部分内容阅读
用张力计测定土壤水分特征曲线,是应用能量观点研究土壤水分时测定非饱和土壤水分运动参数的方法之一。在对土壤水分进行定量分析时,常用的参数有导水率(K)、扩散率(D)、比容水量(C),而非饱和土壤水分特征曲线的斜率就是比容水量(C),它与土壤含水量或基质势的关系曲线能够表明土壤在不同含水量或基质势下所能提供给植物的水分。因为张力计能测定0.00—0.85巴吸力范围内的土壤湿度,即土壤中有效水分的50—70％,这在干旱或半干旱地区有广泛的实用价值,所以用它测定土
Measuring the soil water characteristic curve with a tension meter is one of the methods to determine the parameters of unsaturated soil moisture during the study of soil moisture from the perspective of energy. In the quantitative analysis of soil moisture, the commonly used parameters are water conductivity (K), diffusivity (D), specific volume of water (C), and the slope of unsaturated soil moisture characteristic curve is the specific volume of water (C) Its relationship with soil moisture content or matrix potential can indicate the water that the soil can provide to plants under different water content or matrix potential. Because tensiometers measure soil moisture in the range of 0.00-0.85 bar suction, which is 50-70% of the available water in the soil, which has wide practical value in arid or semi-arid areas, so it can be used to measure soil