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本文依据冬小麦和玉米的田间试验资料及生长箱内模拟试验结果，硬究了土壤植物系统中瞬态水流的时间“常数”变性。结果表明，时间“常数”并不是一个常数，而是一个变量，它不仅存在日变化和季节性变化，而且受初始有效土壤水势、初始叶水势的影响。时间“常数”的季节性变化趋势是苗期大，成熟期小；日变化趋势是早、晚间大，中午小。不同水分处理的时间“常数”存在明显的差异，总趋势是有效土壤水势越低，时间“常数”越小。
In this paper, based on the field experiment data of winter wheat and maize and the simulation test results in the growth chamber, the time constant “denaturation” of transient flow in soil plant system was studied. The results show that time “constant” is not a constant, but a variable, which not only has diurnal and seasonal variations, but also is affected by initial effective soil water potential and initial leaf water potential. The seasonal variation of time “constant” is that the seedling stage is large and the maturity stage is small. The daily variation trend is early, late evening and noon. There are obvious differences in the “constant” of different water treatments. The general trend is that the lower the effective soil water potential, the smaller the “time constant”.