以水文水资源情势为核心的黄河源区环境生态系统近年发生了显著变化。
The ecosystem of the source area of the Yellow River, taking the hydrologic and the water resources regimes as the basic indexes, has been changed remarkably during the recent years.
建立一个堆填区取代了植物和野生动物生活在那里，这是至关重要的环境生态系统。
The creation of a landfill displaces the plant and wildlife living there which are crucial to the environments ecosystem.
农业是在大自然中进行的；大自然里的生态系统中各种生物和活动相互影响，而粮食的生产正是处在这样的生态环境中。
Agriculture takes place in nature, among ecosystems of interacting organisms and activity, and crop production takes place within that ecosystem environment.
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