摘要
根据土壤墒情与电学RC(Resistance capacitance)电路电流变化规律的共同特征,从理论上对土壤墒情动态变化趋势进行了研究,获得了利用瞬时单位线法推求土壤含水量的表达式。通过对湘乡实验站土壤重量含水率理论计算值与实验值进行对比分析,其平均相对误差小于0.02。实例证明,RC阻容模型之瞬时单位线法推求土壤含水量简单实用,可为干旱分析和土壤墒情研究提供理论依据。
According to the change rule of the soil moisture content and electrical RC （ Resistance capacitance ） parallel circuit , the change trend of soil moisture dynamic was analyzed and the formula of soil moisture was obtained by using the instantaneous unit hydro -graph method.Through the comparison between soil gravimetric water content and modeled water content in Xiangxiang experiment sta -tion,the relative error less than 0.02 was obtained.It is proposed that the instantaneous unit hydrograph method for the estimation of soil moisture content is simple and practical ,which can provide the theoretical basis for analysis of drought and soil moisture research .
出处
《土壤与作物》
2014年第3期99-104,共6页
Soils and Crops
关键词
土壤墒情
单位线
衰减速度
RC电路
动态分析
soil moisture content
unit hydrograph
decay rate
resistance capacitance circuit
dynamic analysis
