These bird fossils have great significance for both the study of the climatic and eco-environmental change at the Ashan site and the avian geographic distribution, mi gra tion and evolution.
这些鸟类化石对研究遗址的生态环境、气候变化以及鸟类地理分布、迁徙和演化等都有重要意义。
The eco-environmental system tends to change and becomes deteriorated with the changes of water resources in utilization and distribution patterns.
伴随着水资源利用分布格局的改变，河西走廊生态环境体系不断演变并趋于恶化。
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