主要气候因子对极小种群野生植物云南蓝果树生长的影响

Effects of Major Climate Factors on Growth of Nyssa yunnanensis,A Plant Species with Extremely Small Populations

为探讨云南蓝果树(Nyssa yunnanensis W.C.Yin)的濒危机理,运用解析木的原理,结合1979—2009年的气象数据,对两株云南蓝果树风倒木进行研究,分析主要气候因子对云南蓝果树生长指标的影响。结果表明:云南蓝果树的径向、高度和年轮宽度的年增长量呈逐渐下降趋势,而材积年生长量呈上升趋势。云南蓝果树生境自1979—2009年年平均气温缓慢地升高,年总降水量和年平均相对湿度值呈总体减少趋势;年均径向、高度生长量和年轮宽度与年平均气温呈负相关,与年降水量和相对湿度呈正相关;年均材积生长量与年均气温呈正相关,与年降水量和相对湿度呈负相关。

As an approach to explore the endangerment of Nyssa yunnanensis , a plant species with extremely small populations, two wind fallen trees were used to establish the correlations between N. yunnanensis growth and major climate factors on data of wood analysis and meteorological data in 1979-2009. The annual growth rate of radial, height and tree-ring width of N. yunnanensis showed a gradual downward trend, but the annual volume growth increased. The meteorological data showed that annual mean temperature was rising, while annual rainfall and annual mean relative humidity were decreasing in the habitat of N. yunnanensis from 1979 to 2009. The radial growth, height growth and tree-ring width of N. yunnanensis is negatively correlated with the annual mean temperature and positively correlated with annual rainfall and annual mean relative humidity, while annual mean volume growth is positively correlated with the temperature and negatively correlated with annual rainfall and relative humidity.