【摘要】 田间持水量是重要的水分常数,在水文学及农业灌溉领域占据重要地位,其准确测定至关重要,现有田间持水量测定方法均存在一定弊端。在仪器法的基础上,结合田间持水量的概念,采用土壤含水量原位监测数据,获得土壤含水量过程线,分别绘制重力作用时段和分子力作用时段的趋势线,二者交点对应的土壤含水量即为田间持水量。结果表明,该方法省时省力、操作简便,精度可靠,具有客观性。更多还原

【Abstract】 Field capacity, an important moisture constant, which plays an important role in hydrology and agricultural irrigation, its accurate determination is critical, however, there are some disadvantages for field capacity determination. On the basis of the instrument method, the in-situ monitoring data of soil moisture is used to plot the variation process line of soil moisture. The field capacity is obtained by determining the intersection of the trend line of the gravity action period and the molecular force action period. Results showed that the method has the advantage of less labor and time, reliability and objectivity.更多还原