阿尼玛卿山地祁连圆柏径向生长对气候的响应  

Horizontal Variations of Climatic Response of Qilian Juniper (Juniperus przewalskii) in the Anyemaqen Mountains

作　　者：彭剑峰[1] 勾晓华[1] 陈发虎[1] 张永香[2] 刘普幸[1] 张永[1] 方克艳[1] 

机构地区：[1]兰州大学西部环境教育部重点实验室中德干旱环境研究中心 [2]中国科学院青藏高原研究所,北京100085

出　　处：《地理学报》2007年第7期742-752,共11页Acta Geographica Sinica

基　　金：国家自然科学基金项目(40671191);国家自然科学基金创新群体基金项目(40421101);国家自然科学基金重点项目(90502008);教育部"新世纪优秀人才支持计划"(NCET-05-0888);高等学校学科创新引智计划(B06026)资助~~

摘　　要：通过对阿尼玛卿山地5个坡面20个祁连圆柏树轮宽度标准年表的分析,发现公共区间内各树木年轮宽度标准年表中的信噪比SNR和样本总解释量EPS值都较高,说明年表中都含有较强的环境信息;树轮宽度年表之间的平均相关为0.35(大多达到95%的置信程度),具有较好的区域一致性。聚类分析使树木年轮宽度年表分成东、西两大部分,而年表的第一主分量显示出:西部树轮的指数序列明显长于东部即树木生长有自西向东扩展的趋势,并且东、西区域树木生长变化的特征年变化具有同步性。东、西树轮宽度年表中第一主分量和第二主分量与气候因子的相关和响应都表现出一定的相似性,但第二主分量对气候因子响应的差异性更显著。西部树木生长PCI的主要限制因子是温度,尤其当年春末夏初及前一年秋季温度影响最大,同样降水也起着重要的作用,西部树木生长PC2的主要限制因子是降水量;而东部树木生长PC1主要受降水的制约,第二主分量PC2的响应分析显示出气候的滞后影响(树木前期生长)是非常重要的限制因子。A spatiotemporal patterns analysis of a network with 20 Qilian juniper （Juniperus przewalskii） tree ring-width chronologies from 5 slopes along a west-east gradient in the Anyemaqen Mountains on the northeastern Qinghai-Tibetn Plateau was performed by means of chronology statistics. Higher SNR and EPS values implied the more climatic information in these chronologies. Most correlations among standard chronologies taken in pairs are significant, with the mean correlation coefficient for all sites being 0.35, indicating that environment condition was consistency. The result of Hierarchical Cluster Analysis showed two well-defined groups at large, corresponding to the two groups, the eastern and the western. Scatter plots of component loadings indicated that stands growing in a similar climate environment are most important on variability of radial growth. The first component of chronologies in east-west regions implied that the center of Qilian juniper （Juniperus przewalskii） growing transplants eastwards along the Anyemaqen Mountains and the eigenvalues （narrow years） tree-growth in the western and the eastern Anyemaqen were synChronous. Correlation between the first principal component （PC1） and the second principal component （PC2） and the climatic factors revealed similarity and differences in radial growth along the west-east gradient in the study area, nevertheless the difference of PC2 is more prominent. Temperature was the main limiting factor to tree growth PC1 in the western Anyemaqen, especially the impact of current late spring and early summer the most significant, and Precipitation was very importance to tree growth, but precipitation was mainly limiting factor of tree growth PC2. Temperature and precipitation held definite commutative.

关 键 词：祁连圆柏 树木年轮宽度年表 聚类分析 主成分分析 气候响应 

分 类 号：S718.4[农业科学—林学]