论文部分内容阅读
高考分值:8~14分名师指要“生态专题主要考点种群的特征和数量变化、群落的结构特征和演替、生态系统的结构、生态系统的能量流动和物质循环的基本规律和应用及信息传递、生态系统的稳定性、生态环境的保护。”原创原典题创典题第1题在东灵山地区海拔900~1900m的垂直宽度内,土壤肥沃、水分适宜,主要分布以白桦为主要乔木的群落。(1)为了调查白桦种群的种群密度,应当采取的调查方法为。与调查草本植物相比,应当注意。(2)调查发现,白桦在生长为成年树前死亡率出现一个高峰,这是由于此树龄的大量白桦个体都已进入乔木层,争夺和
College entrance examination scores: 8 ~ 14 points Master refers to “ecological theme of the main test sites Population characteristics and quantitative changes, the community structure and succession, the structure of ecosystems, ecosystem energy flow and material circulation of the basic rules and applications And the transmission of information, the stability of the ecosystem and the protection of the ecological environment. ”The original problem of the original classic questions 1 In the East Lingshan elevation of 900 ~ 1900m vertical width, fertile soil, water suitable, the main distribution of Betula platyphylla The main tree community. (1) In order to investigate population density of Betula platyphylla population, the survey method should be adopted. Care should be taken compared with the investigation of herbs. (2) The survey found that the mortality of birch trees before they grow into adult trees shows a peak, because a large number of birch bark individuals of this age have entered the arbor layer and compete for