秦岭东部牛背梁自然保护区巴山冷杉树轮宽度与气候因子的关系  

The relationship between Abies fargesii tree-ring width and climate factors at Niubeiliang Natural Reserve in eastern Qinling Mountains of China

作　　者：秦进[1] 白红英[1] 翟丹平 王俊[1] 李书恒[1] 黎斌 

机构地区：[1]西北大学城市与环境学院,陕西西安710127 [2]西安市植物园,陕西西安710061

出　　处：《冰川冻土》2017年第3期540-548,共9页Journal of Glaciology and Geocryology

基　　金：国家林业公益性行业科研专项(201304309);陕西省科学院重点项目(2013K-01)资助

摘　　要：基于树木年代学方法,通过响应分析与回归分析对秦岭东段主脊牛背梁自然保护区巴山冷杉(Abies fargesii)树轮宽度所蕴涵的气候意义进行探讨。结果表明:巴山冷杉年轮宽度标准化年表和差值年表的各项特征值较高,反映树轮资料包含较强的环境信息;归纳相关分析结果,发现春夏季气温是树木径向生长的主导因子,当年1-8月不同时段的平均气温普遍对巴山冷杉生长有促进作用,其中1-2月平均气温对树木生长的影响最为显著,而前一年10-11月平均气温的"滞后作用"不可忽略。降水不是该区巴山冷杉生长的主要限制因子,但当年1-2月的降水过多会导致组织生长减缓;回归模型能较好模拟年轮宽度与气候因子之间的关系,据此结合极宽、极窄轮出现年份的气候状况印证了巴山冷杉树轮宽度年际变化是生长季初期气温、降水相互制衡、共同作用的结果,并推测巴山冷杉林带位置有向高海拔迁移的可能。为秦岭植被生长在气候变化过程中的生态模式演变研究提供一定的依据。By the methods of dendrochronology,response analysis and multi-linear regression analysis,the climate connotation were uncovered,which is contained in the Abies fargesii tree-ring width in the major ridge of the eastern Qinling Mountains in Niubeiliang Nature Reserve.Both of Abies fargesii standardized chronology and residual chronology are of high characteristic values,which indicated that the tree-ring materials contain high environmental information.Through correlation analysis,it is discovered that temperatures in spring and summer are the dominant factor for the radial growth of Abies fargesii.The temperature averaged from January to August,especially from January to February,has positive effect on the growth of Abies fargesii.The temperature averaged from previous October to November also has effect on matter accumulations of Abies fargesii.Precipitation is not the major limiting factor for the growth of tree,but high precipitation in January and February might slow down the organization of formation for Abies fargesii,whereas,the precipitation from February to April had positive effect on the accumulation of photosynthesis product.The multi-linear regression model is available to simulate the relationship between climate factors and the chronology.It is proved via the analysis of typical year that the variation in the tree-ring annual width is due to a mutual and counterbalance effect of air temperature and precipitation in growth season.It is predicted that the Abies fargesii forest may migrate to higher altitude.This study provides a basis for studying the ecological pattern evolution under the process of climate change in Qinling Mountains.

关 键 词：牛背梁 巴山冷杉 树轮宽度 气候变化 

分 类 号：P467[天文地球—大气科学及气象学]