大兴安岭不同坡向兴安落叶松径向生长对气候变化的响应

摘要

For comparing radial growth of Larxi gmelinii ( Rupr.) Kuzen in response to climate change for different slope aspect in the Daxing ’ an Mountain , we collected tree ring samples in central and southern part of Daxing ’ an Mountain to establish the chronology .For southern slope in the central region , the southern and northern slope in the southern region , as the temperature rised in recent decades , there was no obvious change in tree ring width index .For the northern slope in the central region , tree ring width index showed a significant upward trend in recent decades , but the temporal change was not consistent, tree ring width index from 1960 to 1980 increased significantly, by 3.57%.Comparatively, tree ring width in-dex showed a significant decreased trend from 1980 to 2008, by 0.89%.There are differences in the change character of tree growth for different slope aspect in the central region of Daxing ’ an Mountain under global warming in recent decades , while in the southern region of Daxing ’ an Mountain , tree growth for different slope aspect has similar change character .%为比较不同坡向兴安落叶松径向生长对于气候变暖响应是否存在差别，在内蒙古大兴安岭地区中部和南部采集不同坡向兴安落叶松年轮样品，建立年表。结果表明：中部地区南坡、南部地区南坡和北坡在近几十年里随着温度升高树木年轮宽度指数变化不大；中部地区北坡年轮宽度指数近几十年总体呈现显著上升趋势，但是在不同时间段内显示出不同的变化规律，1960—1980年树木年轮指数显著上升，年轮平均宽度指数增加3．57％，1980—2008年年轮宽度指数显著下降，年轮平均宽度指数减少0．89％。研究证实，大兴安岭中部地区南坡和北坡兴安落叶松径向生长规律存在差异，而大兴安岭南部地区南坡和北坡兴安落叶松径向生长规律相同。