气候变化对塞罕坝地区天然华北落叶松径向生长的影响分析

Precipitation Influences the Growth of Larix principis-rupprechtii in Saihanba Region,Hebei

采用交叉定年、年轮宽度测定和去除生长趋势,建立华北落叶松年轮宽度年表方法,以塞罕坝地区天然林中的主要优势树种华北落叶松为对象,研究年轮宽度和主要气候因子(温度、降水)的相关关系。结果表明:年轮宽度与6—7月平均温度呈负相关,但未达到显著水平;年轮宽度与5—7月平均降水量呈显著正相关。由此可见,塞罕坝地区天然林中华北落叶松的径向生长主要受到降水变化的影响,降雨略增有利于华北落叶松径向生长。

In order to investigate the effects of climate change on the radial growth of Larix principis-rupprechtii Mayr and predict the future influences of climate change to tree growth,tree-ring chronology was established after cross dated and measurement and detrending.The correlation between ring width and the main climatic factors(tem⁃perature and precipitation)was analyzed for Larix principis-rupprechtii.The results were as follows:there was a sig⁃nificant positive correlation between ring width and the month mean temperature of previous February.Ring width was positively significantly correlated to month mean rainfall of current July and month mean rainfall of from May to July.In summary,the radial growth of Larix principis-rupprechtii is mainly controlled by May-July precipitation.Rainfall increasing are beneficial to the radial growth of Larix principis-rupprechtii.