The climatic changes in southwestern Asia were more subtle, in that they involved shifts in mountain snow lines, rainfall patterns, and vegetation cover.

亚洲西南部的气候变化更为微妙，因为它们涉及到山地雪线、降雨模式和植被覆盖率的变化。

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Though it is di? Cult to grow trees in the saline-alkali soil, the ground cover and wetland vegetation are rich and vary in response to subtle changes in the water table and PH values.

尽管难以在盐碱地里栽种树木，但覆盖地表和湿地的植被异常丰富，随着地下水位和PH值的细微变化而呈现不同的形态。

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The discrepancy can be explained by long term changes in vegetation and ice cover.

植被和冰层覆盖的长期变化能够说明这种差异。

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This second mission is supposed to loft the Proba-V satellite to collect data on land cover and vegetation changes over the entire globe every couple of days.

BBC: Bad weather postpones Europe's Vega rocket launch