山东省农业气象自动观测站土壤水分特征曲线研究

Research on Soil Water Characteristic Curve Based on Agricultural Meteorological Automatic Observatory of Shandong Province

为了更好地对山东省农业气象自动观测站进行评估,研究土壤水分运动规律,根据山东省120个测墒站测定的不同土壤质地类型及其凋萎湿度资料,利用Van Genuchten模型来描述土壤水分特征曲线(h-q曲线),建立山东省农业气象自动观测站土壤体积含水率和土壤水势的关系。综合分析表明,壤土、粘土的田间稳定有效水含量高于砂土的,稳定向植物供水能力较强,对水分的自身协调能力较强,因而对旱涝灾害的抵抗力也强。

In order to better evaluate the Shandong agricultural meteorological station, research on regulation of soil water movement, according to the data from 120 moisture measurement stations in Shandong Province, the author measured different soil texture and wilting coefficient, using Van Genuchten model to describe soil water characteristic curve （b-q curve） to establish the connection between moisture volume ratio and soil water potential based on agricultural meteorological automatic observatory of Shandong Province. The comprehensive analysis indicated that： sticky soil had higher stable and effective water content in field than sand, so the sticky soil could stably provide water to plant and coordinate water themselves, thus sticky soil had a strong ability in resistance to drought and flood.