黔中地区马尾松径向生长对气候变化的响应

以黔中地区马尾松为对象，运用树木年轮建立了该区马尾松标准年表，分析了马尾松径向生长与该地区温度、降雨等主要气候因子的关系。结果表明：黔中地区马尾松的径向生长对温度较为敏感，当年2月和连续月份2—4月温度与马尾松年轮宽度呈显著正相关，2月份极端低温可能会对树木当年年轮的生长产生显著影响，表明黔中地区生长季早期的温度可促进马尾松的径向生长。径向生长与降雨量相关性不显著，但马尾松的年轮与当年3月及6月平均空气相对湿度呈显著正相关，表明生长季前中期，空气相对湿度也是影响黔中地区马尾松生长的重要环境因子；连续月份尺度中，年轮与上年10月至当年2月空气相对湿度呈显著正相关，表明其受前一年空气相对湿度的影响较大，存在“滞后效应”。因此，生长季前中期温度和空气相对湿度是影响黔中地区马尾松径向生长的主要因素，且当年2月份的温度可能起到关键性作用。

Response of Radial Growth of Pinus massoniana to Climate Change in Central Guizhou Province

Taking Pinus massoniana in central Guizhou as the object of study, a standard chronology of P. massoniana was established with tree-ring, and correlation analysis between radial growth and local climatic factors such as temperature and rain precipitation have been conducted. The results showed that the radial growth of P. massoniana in central Guizhou Province is sensitive to temperature and the series of tree-ring widths exhibited significantly positive correlations with the local temperature in February and from February to April of the consecutive months. Also, extreme minimum temperature in February can limit the growth of P. massoniana of current, indicating the temperature in the early growing season in central Guizhou promotes the radial growth of P. massoniana.The correlation between precipitation and tree-ring was not significant, but the tree-ring width of P. massoniana yielded significantly positive correlations with the local air relative humidity in March and June of the current, indicating that air relative humidity was also an important environmental factor effecting the growth of P. massoniana during the early and middle part of the season. In the continuous month scale, the air relative humidity from October of last year to February of the current year showed a significant positive correlation, indicating that the radial growth of P. massoniana is greatly affected by the air relative humidity of the previous year and the response of radial growth to air relative humidity had lag effect. To sum up, temperature and air relative humidity in the early and middle growing season are the main climatic factors effecting the radial growth of P. massoniana in central Guizhou, especially the temperature in February may play a key role.