王朗自然保护区岷江冷杉林(Abies faxoniana)更新及其种群结构分析  

Research on Regeneration Impact factors and Population Structure of Abies faxoniana in Wanglang Nature Reserve,Sichuan Province

作　　者：谭留夷[1] 赵志江[1] 康东伟[1] 康文[1] 李俊清[1] 

机构地区：[1]北京林业大学省部共建森林培育与保护教育部重点实验室,北京100083

出　　处：《四川林业科技》2011年第1期31-37,共7页Journal of Sichuan Forestry Science and Technology

基　　金：林业公益林行业科研专题(200804001);十一五科技支撑资助(2008BADB0B04)

摘　　要：岷江冷杉(Abies faxoniana)林是四川王朗自然保护区主要群落类型,本文选择典型的亚高山针叶原始林设置标准样地,对其幼苗幼树查数轮生枝、大树钻取树轮样芯确定个体年龄,分别建立苗高—年龄、胸径—年龄的回归方程得到整个种群的年龄结构,通过编制生命表对其进行生存分析。结果表明,岷江冷杉存活曲线属于Deevey-Ⅲ型,在30 a之前经历了一次死亡高峰,幼苗个体丰富,但死亡率高。利用回归方程推算出冷杉幼苗年更新量同近20余年的气象因子进行相关分析发现,热量条件是影响该区岷江冷杉更新的主导因子,且生长期的温度有利于冷杉更新。年降水过高,日照时数过长不利于冷杉幼苗更新。Abies faxoniana forest is a major forest type in Wanglang National Nature Reserve.This paper established a standard sample plot to study regeneration impact factors and population structure of Abies faxoniana.The age structure of trees was estimated by counting branches or tree-rings and by establishing regression to get age structure.Analysis was made of the population dynamics by creating the age-specific life table and drawing the survivorship curve,mortality curve,and hazard rate curve based on the age structure.The results showed that the survivorship curve of Abies faxoniana was a Deevey-Ⅲ type.There existed two peaks of mortality in the lifespan,one was from seedlings to young trees（0～30 years）.Saplings banks were rich but had a high mortality ratio.The relationship between climatic factors and regeneration of Abies faxoniana during the past 23 years was analyzed by using climate data.The result showed that the temperature was a key factor that would influence the natural regeneration of Abies faxoniana.There was a positive correlation between regeneration and temperature in August.But the annual mean precipitation and accumulated sunshine hours negatively related to the regeneration.

关 键 词：岷江冷杉 种群结构 更新量 气候因子 生存分析 

分 类 号：S791.14[农业科学—林木遗传育种]