新疆阿勒泰中东部树轮宽度年表特征及其气候响应

The Characteristics of Tree-ring Width Chronologies on Middle and Eastern of Altay Region and Their Responding to Climate Change

利用采自阿勒泰中东部地区8个树轮采点的树轮资料,建立宽度年表,对比这些树轮宽度标准化年表的统计特征,并分析其与气候要素的相关性。结果表明:阿勒泰中东部地区8个采点的标准化年表的平均敏感度都较低,最高的喀拉依里克站南(KLN)为0.194,这与该区海拔较高、降水丰富、土层较厚、坡度较小有关。8个年表显著性水平达到0.01的自相关大多在4阶以内,反映该区树轮宽度生长对气候的响应主要表现在当年及其后的3a,"滞后效应"比较明显。8个树轮宽度标准化年表与布尔津气象站的生长季及其前期的降水多呈正相关。其中,阿勒泰地区中部义河山南(YHN)标准化年表所含的降水信息最为丰富,与布尔津气象站上年7月至当年4月的降水量相关密切,相关系数达0.561;东部的也克卓勒(YKZ)采点树轮宽度生长与布尔津气象站当年1—12月月平均温度相关密切,相关系数达0.557。这两个年表与降水和温度的相关时段具有明确的树木生理学意义。

Eight tree-ring chronologies in middle and east Altay were developed,and the features of eight standardization chronologies were analyzed in this paper.It showed that all the mean sensitivity of eight chronologies was relatively low,in which the highest was 0.194 of KLNchronology.It may relate to higher altitude,rich precipitation,thick soil layer and flat slope in this area.The autocorrelation with significance level at α=0.01 for most chronologies was smaller than 4 order,which reflected the response of tree-ring width growth to the climate parameters in the same year and next 3 years,and the ＂lag effect＂ was very obvious.The standardization chronology was positive correlated with precipitation during growing and pre-growing season.The correlation coefficient between the chronology of YHN and precipitation from last July to current April was 0.561,and that between chronology of YKZ and mean temperature from January to December was 0.557.The correlation time period of these two chronologies and precipitation and temperature was embedded with obvious tree physiological significance.