Plant cover is one of the most important sign of oasis ecological environment change.
植被覆盖度是绿洲生态环境变化的最重要标志之一。
The dry weather of the Northwest China is a background factor of ecological environment change, we shouldn't neglect it.
当然西北地区的干旱气候是环境变迁的背景因素，我们不应忽视它。
The research of land use change is the foundation of the ecological environment change research, and it is also the scientific policy-making basis which regulates the human behavior.
土地利用变化的研究是生态环境变化研究的重要基础，也是调控人类行为的科学决策依据。
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