开都河流域天山桦树轮宽度年表的建立及其气候响应  

Development of the tree-ring width chronology of Betula tianschanica for the Kaiduhe River watershed and its climate response

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

机构地区：[1]中国气象局乌鲁木齐沙漠气象研究所,中国气象局树轮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》2015年第9期3034-3042,共9页Acta Ecologica Sinica

基　　金：中央级公益性科研院所基本科研业务费项目(IDM201204);国家科技支撑计划项目(2012BAC23B00);国家重点基础研究发展计划(2013CB955900);科技部公益性行业(气象)科研专项(GYHY201206014)共同资助

摘　　要：利用开都河流域中段采集的天山桦树芯样本,建立了这一采样点的树轮宽度年表。该年表的特征参数与其他地区已有的桦木树轮宽度年表相近,且能较好地反映研究区内天山桦树轮宽度变化的基本特征。该年表与研究区内雪岭云杉树轮宽度年表间的相关分析表明,两者在全频域、高频域及低频域上均存在显著正相关。树木生长气候响应分析结果显示,天山桦树轮宽度与降水量的相关则不显著;而与上年12月呈显著正相关（r=0.346,P〈0.01,n=59）,与当年6月的平均气温呈显著负相关（r=-0.312,P〈0.01,n=60）。该年表存在2.1、4.0a和-50a变化准周期,并且其与3月多元El Nio-Southern Oscillation（ENSO）指数存在相似的变化趋势。In this study,a total of 40 cores from 20 birch trees（ Betula tianschanica） were obtained for one single site,named as Haerhatigou（ HEX） in the middle section of the Kaiduhe River watershed in August 2011. All the tree-ring cores were naturally dried,mounted,surfaced,and cross-dated following standard dendrochronological procedures. Each ringwidth was measured with a resolution of 0. 001 mm by a dendrometer（ Velmex Measuring System）. The quality control of the cross-dating was carried out using the COFECHA program. Because of the low correlations with the master dating series,5 cores from 3 trees were rejected. In the end,35 cores from 18 trees were used for further analyses. The number of the absent rings is 78,and the rate of the absent rings in the samples is 2. 325%. The ARSTAN program was used for detrending and developing tree-ring chronologies. The age- and size- related variation of the tree-ring widths was removed by a single detrending process applied on each tree-ring measurement： a negative exponential curve,a kind of conservative function. After all these processes,three kinds of chronologies from one sample site were obtained： standard chronology（ STD）,residual chronology（ RES）,and Arstan chronology（ ARS）. The statistical characteristics of the HEX chronology are similar to other birch chronologies＇ in the previous studies. And the chronology can well represent the variety of the radial growth of birch trees in the study area. The significant positive correlations in the original,high-,and low- frequencydomain between the HEX chronology and a chronology of spruce trees（ HE4） mean that the dominant climatic factors of two kinds of trees are similar. Pearson correlation analysis was applied to investigate the relationship between the tree-ring width and the climatic data during the calibrated period（ 1952—2011）. The monthly precipitation and mean temperature from the previous August to the current September and the average meteorological data in summer were used

关 键 词：开都河 天山桦 树轮宽度 气候响应 

分 类 号：S718.45[农业科学—林学]