种群在单位面积或单位体积中的个体数就是种群密度。种群密度是种群最基本的数量特征。不同的种群密度差异很大,同一种群密度在不同条件下也有差异。在用样方法测量种群密度时要随机取样
It has the characters of small individual size,fast breeding,the high population density,great harmness,and it can harm more than 150 crops.
它具有个体小、繁殖快、种群密度高、为害重等特点,可为害150余种作物。
参考来源 - 黄花蒿杀螨物质活性追踪及杀螨作用机理研究Obviously,the population density of ring-necked pheasants in Liaoning was lower than those in other provinces and other countries abroad,so conservation strategies to recover its population were discussed.
辽宁省调查地区的环颈雉种群密度明显低于其他省市和欧美地区,应采取加强宣传教育,保护栖息环境等措施。
参考来源 - 辽宁省环颈雉种群密度初步调查·2,447,543篇论文数据,部分数据来源于NoteExpress
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