2019高考生物二轮复习专题五生态第Ⅰ课时基础自查——学生为主体抓牢主干以不变应万变课件.ppt

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1、,第课时 基础自查 学生为主体抓牢主干,以不变应万变,串点成面自成体系,点点落实(一) 种群的特征、数量变化,一过基础,“S”型曲线,“J”型曲线,项目,_,_,K值有无,增长率和增长速率,现实状态:食物、空间有限;不断变化的自然条件;有种内斗争和种间竞争,理想状态:食物和空间条件充裕;气候适宜;没有敌害;无迁入、迁出,前提条件,增长模型,图 示,t1之前,种群数量_K/2,由于资源和空间相对充裕,种群数量增长较快,当种群数量为_时,出生率远大于死亡率,种群增长速率达到最大值; t1t2,由于资源和空间有限,当种群密度增大时,种内斗争加剧,天敌数量增加,种群增长速率_; t2时,种群数量达到_

2、值,此时出生率等于死亡率,种群增长速率为_,解 读,二过易错,三过小题,03,点点落实(二) 群落的结构与演替,一过基础,水平结构,垂直结构,环境因素:地形变化、土壤湿度、盐碱度的差异及_不同;生物因素:生物_不同,以及人和动物的影响,植物:阳光动物:_和_条件,决定因素,常呈_分布,_现象,现象,次生演替,初生演替,类型,弃耕农田上的演替,裸岩上的演替,实例,_较为关键,自然因素,影响因素,_,_,速率,经历的时间_,经历的时间_,时间,虽失去了原有植被,但仍保留了原有_条件及植物的_或其他_,原先从没有过_的环境或曾经有过但被 _消灭了的环境,起点,二过易错,三过小题,03,点点落实(三) 生态系统的结构与功能,一过基础,二过易错,三过小题,03,点点落实(四) 生态系统的稳定性及环境保护,一过基础,三个层次,就地保护、_、生物技术保护、法制保护,四类保护,_价值:目前尚不清楚的价值,_价值:防风固沙、调节气候、涵养水源、保持水土,_价值:工业原料、药用、食用、文学艺术创作、旅游观赏、科学研究,三种价值,_多样性(同物种内)、_多样性、_多样性,二过易错,三过小题,03,谢,观,看,THANK YOU FOR WATCHING,谢,

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