一、种群增长的“J”型曲线该曲线是在食物和空间充裕、气候适宜、没有敌害,同时种群不受资源和空间的限制,种群内个体没有迁入和迁出,无年龄结构和性别比例对生殖的影响等理想条件下形成的种群数量的变化规律。【例1】有人把水葫芦引入了一个热带国家,现已阻塞了航道,成了在河 First, the “J” curve of population growth The curve is in ample food and space, climate is suitable, there is no enemy, at the same time the population is not subject to resources and space constraints, individuals within the population did not move in and out, no age structure and Sex ratio on reproduction and other ideal conditions under the conditions of the population changes. [Example 1] Someone brought the water hyacinth into a tropical country and now blocked the waterway and became a river