论文部分内容阅读
近年来,我国各地在田间及室内开展的灌溉、排水试验中都广泛地应用张力计来研究土壤水分运动。我们在试验过程中,发现在同一条件下张力计量测的灵敏度有较大变化,即量测的结果有较大的误差。为了使每次试验能测到较可靠的结果,在使用张力计做试验前,必须进行认真的检验工作。由于张力计瓷头的渗透率不同,会使量测负压读数的灵敏度不一致:渗透率大,张力计负压读数上升快;相反,渗透率小,负压读数上升较慢。因此,在张力计的检验中,
In recent years, tension gauges have been widely used in irrigation and drainage tests conducted in various fields and indoors in China to study soil moisture movement. During the test, we found that under the same conditions, the sensitivity of the tension measurement has a greater change, that is, the measurement results have a greater error. In order to make more reliable results for each test, careful testing must be performed before using a tensiometer for testing. Due to the different permeability of the tensiometer porcelain head, the sensitivity of the measurement of the negative pressure reading is inconsistent: the permeability is high, and the tension meter negative pressure readings rise quickly; on the contrary, the permeability is small and the negative pressure readings rise slowly. Therefore, in the tensiometer test,