天山北坡中部不同海拔高度雪岭云杉树轮宽度气候响应对比分析  

Tree-ring-width Growth Responses of Picea schrenkiana to Climate Change for Different Elevations in the Central Tianshan Mountains

作　　者：喻树龙[1] 袁玉江[1] 秦莉[1] 尚华明[1] 张同文[1] 陈峰[1] 张瑞波[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,中国气象局树木年轮理化研究重点开发实验室/新疆树木年轮生态实验室,新疆乌鲁木齐830002

出　　处：《沙漠与绿洲气象》2016年第3期30-38,共9页Desert and Oasis Meteorology

基　　金：国家自然科学基金(41205070);科技部公益性行业(气象)科研专项(GYHY201206014);公益性科研院所基本科研业务费专项资金项目(IDM201202)共同资助

摘　　要：利用天山北坡中部沙湾地区两个坡面随海拔高度采集的雪岭云杉树芯样本,建立了13个树轮宽度年表。分析结果表明,2个坡面年表特征值随海拔高度的变化而不同,不同海拔树轮宽度对气候因子的响应呈现规律性。高低海拔采样点在生长季前对气候因子的响应相同,而在生长季则呈相反的响应。在生长季,高海拔采样点随海拔的升高,树轮宽度对气温的响应降低。不同坡面间受小生境的干扰较大,坡度较小的大鹿角湾高海拔采样点主要受气温的影响,而在坡度较大的石头沟高海拔采点则对降水有更明显的响应。沙湾树轮宽度年表对PDSI指数的响应与大尺度范围的树轮响应一致,即与PDSI呈正相关,低海拔区域响应最显著。主成分分析表明,在同一坡面树轮宽度年表的前3个主分量可以反映因海拔高度变化气候因子对树木年轮生长的影响。2个坡面树轮宽度年表的第一主分量表征持续干旱对整个坡面的影响。Tree-ring cores have been taken from thirteen sites at different elevations of two slopes in the central of Tianshan Mountains.These tree-ring-width chronologies of Picea schrenkiana have been determined using standard dendrochronological methods. The mean sequence of dependable tree-ring-width standard chronology among sampling sites decreased with increasing altitude. Tree- growth appeared different characters during cool or warm weather.Responses of upper- and low- limit to climatic factor in the non-growth season are similar and are contrary during the growth season. The response to temperature of tree-ring-width in high altitude reduced along with increasing of elevation in the growth season. Interference of growing environment is obvious in the different slopes, The DLJ site in the high altitude was mainly influenced by temperature, while tree growing in the STG site was more obvious response to precipitation. Relationships between chronologies and PDSI are positive correlations in keeping with relation in the central and western of North China. The best correlation appeared in low elevation. Principal component analysis was used to indicate regional variations in radial growth patterns.Among these tree-ring-width chronologies, the earliest three PCs explain 85% of their total variance, and response tree-ring growth to climate change for different elevations.According to the correlation analyses, the first PC of the all chronologies showed that moisture and temperature of the late period of prior year growth season and the early period of current year growth season are the most important limiting factors of tree growth, especially influence of persistent drought to same slope.

关 键 词：树木年轮 雪岭云杉 天山北坡 海拔高度 

分 类 号：P467[天文地球—大气科学及气象学]