控制放牧密度和开展环境修复是冰岛最主要的水土保持措施。
Controlling livestock grazing density and implementing environmental restoration are important measures for soil and water conservation in Iceland.
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。
Taking the grazing ecological systems as an example, the positive and negative feedback of the density dependence population regulations was analysed.
放牧黄牛选择在高度较高、密度低、生物量高的斑块采食。
Grazing cattle choose to intake in those patches whose height or biomass is higher, but density is lower.
放牧绵羊的食物组成与各种植物在群落中的相对生物量和高度呈极显著的正相关，而与密度相关性不大。
The selective ingestion of herbage had a positive correlation with herbage relative biomass and height , but it had no obvious correlation with density.
而种植苜蓿样地等节跳虫科个体密度最大，其大小是过度放牧样地等节跳虫科的 3.33倍。
At sites of the planting alfalfa treatment, the individual density of Isotomidae reached 3.33 times of over grazing treatment.
草场放牧活动使布氏田鼠密度增加。
草场放牧活动使布氏田鼠密度增加。
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