天山中部山区不同胸径天山云杉对气候的响应  

Diameter-dependent growth responses of Picea schrenkiana to climate in the middle brae of Tianshan Mountain

作　　者：王婷[1,2] 于瑞德[1] 杨美琳[1] 冯如[1,2] 康静静[1,2] 

机构地区：[1]中国科学院新疆生态与地理研究所干旱区环境演变实验室,乌鲁木齐830011 [2]中国科学院大学,北京100049

出　　处：《应用与环境生物学报》2016年第4期579-585,共7页Chinese Journal of Applied and Environmental Biology

基　　金：国际(地区)合作与交流项目(NSFC-UNEP 41361140361);新疆维吾尔自治区高层次引进人才项目(Y642091001)资助~~

摘　　要：运用树木年轮气候学的方法,研究天山中部山区天山云杉(Picea schrenkiana)不同胸径年表特征以及与气候因子之间的关系,揭示不同胸径云杉对气候因子的敏感度差异,以及胸径大小因素对年表的潜在影响.结果表明:(1)云杉敏感度与胸径大小有线性负相关关系,说明小胸径云杉与气候变化关系密切;(2)不同胸径云杉年表对气候因子的响应存在一致性,均表现为对上一年月降水与月平均温度存在显著的滞后作用,与上一年8月降水以及当年4、5月降水正相关,与上一年8、9月平均温度负相关,与当年生长季温度负相关;(3)不同胸径云杉年表对气候响应存在一定的差异,大胸径云杉主要是对上一年8月、当年5月降水的正响应,对月平均温度无显著的响应关系,而小胸径云杉不但对上一年8月和当年4、5月降水有显著的响应关系,对当年5月平均温度也有显著的负响应关系.因此,在树木年轮气候学研究中应该考虑胸径大小因素对年表的影响.Tree rings can record the past climatic conditions therefore allow retrospective analyses of climate-growth relationships. Generally, it is assumed that the relationships between tree growth and climate conditions are age independent, as long as the biological growth trends related to tree age are removed from the tree-ring data through detrending. However, if trees of different diameter respond differently to climatic conditions, a dendroclimatic analysis based on even-diameter samples may be biased in capturing climatic variability throughout the length of the chronology. To explore the radial growth of Picea schrenkiana of different diameters in response to meteorological factors, dendrochronological measurements were carried out to 27 large trees （LAG, diameter 40-50 cm） and 49 small trees （SMA, diameter 20-30 cm） of the species in the middle brae of Tianshan Mountain, Xinjiang, and the correlations between the tree-ring chronology data and meteorological factors were studied. The results showed negative correlation between the mean sensitivity and diameter at breast height （DBH）. The STD chronologies in trees of different DBH responded to the meteorological factors in a similar way, i.e. the STD chronologies were positively correlated to the precipitation in August of the previous year and the summer of the current year （P 〈 0.05）, and negatively correlated to the temperatures in August and September of the previous year and the summer of the current year （P 〈 0.05）. On the other hand, the SMAs responded positively to the precipitation in August of the previous year and April and May of the current year, but negatively to the temperatures in May of the current year. The LAGs responded positively to the precipitation in August of the previous year and May of the current year. Therefore such differed correlations between the treering chronologies and the meteorological factors among the trees of different diameters should be taken into consideration in dendrochronological studies.

关 键 词：天山云杉 胸径 降水 温度 

分 类 号：S791.18[农业科学—林木遗传育种]