Soil nutrients not only have spatial variability, but also change with the time.
土壤养分不仅具有明显的空间变异，而且在时间上也表现出一定的变化。
The spatial variability of runoff area has a great effect on the time-space input of sediment supply into rivers.
流域产流面积的空间变化对其产沙、供沙的时空输入特性具有制约作用。
As time passes by, spatial variability of soil moisture gradually weakens.
随着时间的推移，土壤含水率的空间相关度降低。
As time passes by, spatial variability of soil moisture gradually weakens.
随着时间的推移，土壤含水率的空间相关度降低。
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