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用时域反射仪测定土壤溶质运移过程中的影响因素

DOI: 10.7685/j.issn.1000-2030.2000.02.014, PP. 57-60

Keywords: 时域反射仪,土壤,溶质运移,影响因素

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Abstract:

通过土柱淋溶试验,研究了用时域反射仪(TDR)测定土壤溶质运移过程中的影响因素。结果表明,TDR测定溶质的浓度存在着上、下限。用Ca(NO3)2作示踪剂时,TDR测定的下限为40mg/L;温度是另一主要的影响因素,随着温度的升高,TDR的电阻值下降;不同流速和不同浓度均对溶质运移的平衡时间有影响。由于重力势的作用,土柱上、下层之间达到平衡的时间也有显著的差异。实验中的淋洗平衡液不宜用蒸馏水或去离子水,用自来水可提高土壤溶液电导率的基线

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