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。
Quadratic orthogonal regressive rotation design of three factors is applied to study the effect of varieties, density and fertilization to maize yield in Xichang ecological area.
采用三因素五水平二次回归正交旋转组合设计，研究玉米品种、密度、施肥措施对西昌地区玉米产量形成的作用效应，建立回归模型并分析各因子的作用规律。
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