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。 Understand the status quo of sustainable development of natural forests in the Three Parallel Rivers in northwestern Yunnan and provide the basis for establishing the monitoring and early warning index system of sustainable development of natural forests. Methods: A fixed plot was established in the Huangjiahe River Basin in Yunnan Province. The natural forest in this plot was monitored for 3 years, and its statistics and analysis were made. Results: Human activities had the most serious damage to semi-humid evergreen broad-leaved forests, followed by deciduous broad-leaved forests, mid-humid evergreen broad-leaved forests and warm temperate coniferous forests. From 2002 to 2003, Is more destructive than in 2001-2002; mild anthropogenic disturbance will increase species diversity, but more than a certain degree of anthropogenic interference will reduce species diversity. Conclusion: Human activities have different impacts on different forest types; human activities have different impacts on natural forests at different years; different human activities have different impacts on species diversity; The results showed that there was a significant precautionary significance in the number of amplitudes and amplitudes of plant species, and the significance of species number, amplitude and plant height were significant forewarning significance. The species number and stock volume of DBH> 2.5 cm had very important warning significance. However, in species diversity index, Except for early warning, species diversity index, ecological dominance index and community evenness index had no obvious warning significance.