摘要
了解滇西北三江并流区天然林可持续发展的现状,并为建立天然林可持续发展监测预警指标体系提供依据。方法:在云南省黄家河流域建立固定样地,对该样地内的天然林做了3 a的监测调查,统计、分析。结果:人类活动对半湿润常绿阔叶林的破坏最为严重,落叶阔叶林次之,中山湿性常绿阔叶林和暖温性针叶林稍轻;2002至2003年度人类活动对天然林的破坏程度大于2001至2002年度;轻度的人为干扰会使物种多样性增大,但人为干扰超过一定程度就会使物种多样性减小。结论:人类活动对不同森林类型的影响程度是不同的;人类活动在不同的年度对天然林的影响程度也是不同的;不同的人类活动强度对物种多样性会产生不同的影响;在生长量指标中,幅积、株丛数和显著度具有明显的预警意义,胸径大于2.5 cm的株丛数和蓄积量有非常重要的预警意义,而在物种多样性指标中,除了物种丰富度有一定的预警意义外,物种多样性指数、生态优势度指数和群落均匀度指数均没有明显的预警意义。
Objective to know the present situation of sustainable development of natural forests in the drainage of ＂three parallel rivers＂ in northwest Yunnan,and provide references for establishing early-warning index system.Method： Through analyzing the monitoring data collected 3 times with fixed plots in Huangjiahe river basin,to know the variations of yield and species diversity of 4 types of natural forests,then to discuss significance of the indices of forest yield and species diversity.Results： The destruction of the semihumid evergreen broad-leaved forest was the most serious,that of the middle montane humid evergreen broad-leaved forest is more serious and those of the deciduous broad-leaved forest and the warm temperate coniferous forest were less serious.The destruction of natural forests from 2002 to 2003 was more serious than that from 2001 to 2002.The low levels of disturbance will lead species diversity to increase,the high levels of disturbance will lead species diversity to decrease.Conclusion： The influences of disturbance by humans on different forests are different.The influences of disturbance by humans on natural forests in different years are different,too.The influence on species diversity is related to humans＇ disturbance level.Among the indices of forest yield,canopy area,stem number and dominance of trees and shrubs are significant for forest early-warning,stem number of DBH ≥ 2.5 cm and stand volume are more significant for forest early-warning.Among the indices of species diversity,Shannon-Wiener index,Simpson index and Alatalo evenness are not significant but species richness is somewhat significant for forest earlywarning.
出处
《西北林学院学报》
CSCD
北大核心
2007年第5期215-221,共7页
Journal of Northwest Forestry University
基金
"十五"国家科技攻关计划项目(2000-K01-04-05-02)
关键词
黄家河流域
监测
生长量
物种多样性
预警
Huangjiahe river basin
monitoring
yield
species diversity
earlywarning
