City as high human settlement of density, the conflict between the human activity and the ecological environment was particularly outstanding.
城市作为高密度的人类聚居地，人类活动与生态环境的矛盾尤为突出。
Taking the grazing ecological systems as an example, the positive and negative feedback of the density dependence population regulations was analysed.
以放牧生态系统为例，本文分析了系统组分种密度相关的种群调节中的正、负反馈和机制。
Forest carbon density is an important indicator reflecting the level of forest ecosystem function in ecological service and product supply.
森林植被碳密度是衡量森林生态系统服务功能和产品供给功能高低的一个重要指标。
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