Population size and protection countermeasures of silver pheasant at maolan national nature reserve , guizhou province 贵州茂兰自然保护区白鹇种群数量与保护对策
This a nimal could not be found in the branches flowing into dongting lake now 长江江豚在洞庭湖的分布范围主要集中在从城陵矶到鲶鱼口一带，其种群数量大致为100 150头。
Population quantity and population structure in response to soil moisture in the clonal tree species hippophae rhamniodes l . subsp sinensis 木本克隆植物中国沙棘种群数量与结构对土壤水分的响应
Effects of different amount of organic fertilizer on populations of aphis gossypii glover and tetranychus urticae koch and the yield of cucumber 有机肥不同用量对瓜蚜和叶螨种群数量及黄瓜产量的影响
The influences on bird species caused by grazing disturbance are not parallel , because different population has different quantity 放牧干扰对群落中各种鸟的影响不平行，体现在不同种群数量的变化。
The results indicated that it was easy , feasible and practical to forecast the dynamics of the adult population with the method 结果表明：应用此方法监测马毛松毛虫种群数量动态的变化，简单、实用、可行。
The harmfulness of l . lagurus is a serious problem for long time , because of undulation of population number and perniciousness 由于其种群数量变动较大，加之它对草场的危害严重，长期以来一直困扰着人们。
Catastrophes such as fire , flood , drought or epidemic may reduce population sizes to a small fraction of their average level 大灾难例如：火灾，洪水，干旱或流行病可能减少种群数量到他们平均水平的一小部分。
A study of assessing impacts of human disturbance on the giant panda and its habitats at the wanglang nature reserve was conducted 本项研究的目的是估计王朗大熊猫种群数量、探讨它的生境选择和人类干扰对大熊猫及其生境的影响。
This suggests that stage structure may be a cause of periodic oscillation of populations and can make the behavior of population models more complex 这说明阶段结构可能是种群数量周期扰动的原因，从而使得种群模型的性态更加复杂。
