植被覆盖度是绿洲生态环境变化的最重要标志之一。
Plant cover is one of the most important sign of oasis ecological environment change.
植被覆盖及其变化是全球和区域生态环境变化的重要指示。
The change of vegetation coverage indicates the changes of global and regional entironment.
土地政策是影响土地利用及生态环境变化的一个重要的驱动因素。
Land policy is one of the most important driving factors affecting the use of land and the change of ecological environment.
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