树轮灰度与树轮密度的对比分析及其对气候要素的响应  

Contrastive analysis and climatic response of tree-ring gray values and tree-ring densities

作　　者：张同文[1] 袁玉江[1] 喻树龙[1] 魏文寿[1] 尚华明[1] 张瑞波[1] 陈峰[1] 范子昂[1] 

机构地区：[1]中国气象局乌鲁木齐沙漠气象研究所,树木年轮理化研究重点开放实验室,新疆树木年轮生态实验室,乌鲁木齐830002

出　　处：《生态学报》2011年第22期6743-6752,共10页Acta Ecologica Sinica

基　　金：国家自然科学基金(40975056,41071072);国家自然科学重大基金(40890051);科技部公益性行业(气象)科研专项(GYHY200806011);科技部科技基础性工作专项(2007FY220200);中央级公益性科研院所基本科研业务费项目(IDM200801);中国科学院寒旱所冰冻圈科学国家重点实验室开放基金项目(C2010003);新疆气象局科学技术研究与应用技术开发项目(C2010002);中国沙漠气象科学研究基金(Sqj2009010);新疆自治区重点实验室开放课题(TRE201001;TRE201003)

摘　　要：通过对比新疆巩乃斯地区艾肯达坂采样点雪岭云杉5种树轮灰度年表与其对应4种密度年表的特征参数、年表曲线及其在全频域、高频域及低频域上的相关系数,发现早材平均灰度和晚材平均灰度的变化能够较好的反映早材平均密度和晚材平均密度的变化,而年轮最大灰度和年轮最小灰度的变化对年轮最小密度和年轮最大密度的变化则反映较差。与这一地区气象资料的相关分析结果表明,当年5月至8月平均最高气温与年轮平均灰度年表的相关性最好且具有明确的树木生理学意义,最高单相关系数为-0.542(P<0.0001,n=51)。证明了树轮灰度在历史时期气候变化研究中的应用潜力,同时也为将来在这一地区开展利用树轮灰度重建历史时期气候变化打下了基础。Dendroclimatology is one of the most important methods for examining past global climate change.Tree-ring data have been used widely as important archives in paleoclimatic research because of their precise dating,annual resolution,and high correlations characteristics with instrumental meteorological data.In recent years,new techniques,such as X-ray densitometry to measure wood density have been used in dendroclimatologic research to show the relationship with the variation of wood density and climate change.However,few laboratories have X-ray densitometry instrumentation,and few dendrochronologists can use such systems,due to high costs and complexity.Tree-ring gray values can be obtained through a tree-ring image analysis system（WINDENDROTM 2005）,which includes a high resolution scanner,a PC computer and a software program.Variation in tree-ring gray values may be regarded as an approximation of variation in tree-ring density.So far there are a few studies that rely on the data of tree-ring gray values.However,studies to correlate tree-ring gray values with tree-ring densities in the same sampling site have not been conducted.Thus,it is important to determine accurate correlations between these measurements,and to verify the potential of tree-ring gray values in dendroclimatology. Healthy spruce（Picea schrenkiana） trees grow in sparse ground vegetation.P.schrenkiana with little or no apparent evidence of human or other disturbances were selected for sampling.Two thin cores（5.15 mm diameter） and one thick core（12.00 mm diameter） were extracted from each tree in different directions for cross-dating.A total of 62 thin cores and 31 thick cores from 31 spruce trees were collected from AKS sampling site（2420-2482 m asl,43°12′12.8″ N and 84°47′47.7″ E） in May 2009,which is located in a mountainous area of the Aikendaban region. All of tree-ring samples were dried,mounted,surfaced and cross-dated following standard dendrochronological procedures.Based on chronological statistics,chronolog

关 键 词：巩乃斯 雪岭云杉 树轮灰度 树轮密度 气候响应 

分 类 号：S718.4[农业科学—林学] S716.3