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。
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