From the historical, natural and ecological point of view, this article researched the course of evolution of the ecological environment in the middle reaches of Yellow River.
从历史、地理、自然、生态的角度，大跨度、高视野、多方位对黄河中游生态环境演变过程进行了探讨。
The spread of the disaster caused by longicorn beetle has not only endangered forestry, but also become a menace to the Yellow River agriculture which largely depends on ecological environment.
近年来，宁夏天牛蔓延成灾，危及林业，对依托于生态环境的黄河农业已构成威胁。
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