森林冠层叶片被取食水平具有高度的时空变异性。
There is a great spatiotemporal variability in the feeding level of folivorous insects in forest canopy.
由于自然植物的生存、进化、生长受环境影响，表现为区域性和时空变异性。
As the environment have an impact on the survival, evolution and growth of the natural plant, it perform regional and spatial variability.
水文系统的有组织复杂性、时空变异性和数据不足是当前水文研究的难点所在。
The difficulty of hydrologic scaling mainly comes from the organized complexity of hydrologic systems, the heterogeneity and variability in space and time, and the insufficiency of data.
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