新疆霍城地区树轮年表的建立及气候意义

通过对霍城地区5个树轮年表多项统计特征参数的对比,表明差值树轮年表对气候变化研究具有应用潜力.在5个差值树轮年表中,阿里比萨依和霍尔果斯年表包含了较多的气候信息.将5个差值树轮年表与附近的霍城和霍尔果斯气象站1960-2005年逐月降水和气温资料进行相关普查.结果发现:2个低海拔树轮差值年表的平均年表与2站当年5月降水呈正相关,且相关性好;而3个上树线树轮差值年表的平均年表与2站上年12月的平均气温呈正相关,且相关性好,其正相关均具有明显的树木生理学意义.对代表性较好的阿里比萨依差值树轮年表进行31年滑动平均发现,其年轮指数具有6高5低的阶段性变化,其变化与伊犁河1818-1990年的丰枯变化具有较好的一致性.

Development and Climatic Significance of the Chronologies of Tree-ring Samples from the Huocheng Rsegion, West Tianshan Mountains

In this paper,the tree-ring cores of Picea schrenkiana Fisch.et Mey collected from five sites at two different elevations in the Huocheng region in the west Tianshan Mountains during the period from July to August 2006 are used to develop five tree-ring width chronologies using standard dendrochronological methods.After comparing some parameters of the five standard and residual chronologies in this region,the results show that the applying potential of residual chronologies is high in researching climate change.In the five residual chronologies,Aribisay and Horgos chronologies contain sufficient climatic information.The correlations between the tree-ring width indexes derived from the residual chronologies and the monthly precipitation and temperature data observed by Huocheng and Horgos meteorological stations during the period from 1960 to 2005 are analyzed,the results show that there is a high positive correlation between the tree-ring width indexes derived from two residual chronologies of tree-ring samples collected from the sites with low elevation and the monthly precipitation at these two stations in May,and between the tree-ring width indexes derived from three residual chronologies of tree-ring samples collected from the sites at the upper tree-line and the monthly temperature in December of the previous yea.Such positive correlation has an obvious tree-physiological significance.The 31-year moving average of the Aribisay residual chronology reveals that the tree-ring width indexes accord highly with the high or low flow of the Yili River.