摘要
[目的]为正确使用TDR法和FDR法测定土壤水分含量提供理论依据。[方法]以铝盒烘干法为标准,通过对TDR法和FDR法进行校验,明确它们的优缺点及土壤温度对测定结果的影响。[结果]室内模拟试验结果表明：3条曲线具有相同的变化趋势;横坐标在3.0~23.0时,θT比θF更接近真实值（θv）;横坐标在18.0~23.0时,θT与θv基本一致;横坐标大于23.0时,θv、θT和θF之间的差距甚小。田间试验结果表明：除了2、3、4和8点,FDR的测定结果与θv的差距都很大;TDR的测定结果与θv的差距都很小。综合分析结果表明：FDR的曲线在最下面,与θv的曲线始终保持一段距离,它们之间只有2个交点;TDR和θv的曲线都在上面,它们距离很小,有7个交点,说明TDR的测定准确度比FDR的高。[结论]用TDR法测定土壤含水量准确、方便、快捷。
[Objective] The purpose of the study was to provide theoretical foundation for determining soil moisture content by using TDR and FDR methods correctly.[Method] With oven drying in aluminum-box as standard,through checking TDR and FDR methods,their advantages and disadvantages and the influence of soil temperature on determination results were confirmed.[Result] The results from indoor simulated test showed that the 3 curves had same change trends;when the abscissa value was in 3.0-23.0,θT was closer to true value（θv） than θF;when the abscissa value was in 18.0-23.0,θT was basically consistent with θv;when the abscissa value was bigger than 23.0,θv,θT and θF had tiny difference.The results from field experiment indicated that except for the points 2,3,4 and 8,the determination results of FDR had quite much difference from θv and that of TDR had quite little difference from θv.The results from integrated analysis showed that the curve of FDR was lowest and always kept some distance from the curve of θv,they only had 2 juncts;both the curves of TDR and θv were above,they had very little distance and possessed 7 juncts,indicating that the determination accuracy of TDR was higher than that of FDR.[Conclusion] The determination of soil moisture content by using TDR method was accurate,convenient and fast.
出处
《安徽农业科学》
CAS
北大核心
2010年第17期9110-9112,共3页
Journal of Anhui Agricultural Sciences
