长白山东坡不同海拔长白落叶松径向生长对气候变化的响应  

Response of radial growth to climate change for Larix olgensis along an altitudinal gradient on the eastern slope of Changbai Mountain, Northeast China

作　　者：于健[1,2] 徐倩倩[3] 刘文慧[4] 罗春旺[1] 杨君珑[5] 李俊清[1] 刘琪璟[1] 

机构地区：[1]北京林业大学林学院,北京100083 [2]江苏农林职业技术学院,江苏镇江212400 [3]中国农业科学院郑州果树研究所,郑州450009 [4]中国环境科学研究院生物多样性研究中心,北京100012 [5]宁夏大学农学院,银川750021

出　　处：《植物生态学报》2016年第1期24-35,共12页Chinese Journal of Plant Ecology

基　　金：国家高技术研究发展计划(863计划)(2013AA122003);国家林业公益性行业科研专项项目(200804001)

摘　　要：为了解高山林线附近树木生长对气候变化的敏感性,选取长白山东坡火山喷发后形成的过渡性植物群落长白落叶松(又称黄花落叶松)(Larix olgensis)林为研究对象,并建立不同海拔高度长白落叶松的3个年轮宽度年表,研究不同生境长白落叶松径向生长对气候变化的响应,并利用冗余分析对不同海拔的年轮指数与气候因子的关系做进一步分析。主要结果如下:(1)高海拔年轮年表的统计特征更显著,比低海拔径向生长对气候因子的响应更加敏感;(2)高海拔径向生长主要受上年生长季前期和生长季气温的限制,尤其是上年6月和8月气温的限制作用,低海拔径向生长主要与降水量有关,受当年9月降水量和当年8月帕尔默干旱指数(PDSI)的共同影响;(3)林线内树木对气候响应的敏感性强于林线外,林线外小生境的异质性及干扰事件频发可能掩盖了树木对气候因子的敏感性,林线下方可能是检验林线处树木生长对气候响应平均状态的最佳位置;(4)不同海拔年轮年表与气候因子的冗余分析与响应函数分析的结果基本一致,进一步证明了冗余分析可以有效地量化树轮指数与气候因子的关系。该研究为全球变暖背景下长白山东坡长白落叶松林的管理及该区域气候重建提供了基础数据。Aims To further understand the sensitivity of tree growth to climate change and its variation with altitude, particularly the growth-climate relationship near the timberline, the radial growth of Larix olgensis in an oldgrowth forest along an altitudinal gradient on the eastern slope of Changbai Mountain was investigated. Methods The relationships between climate factors and tree-ring index were determined using bootstrapped response functions analysis with the software DENDROCLIM2002. Redundancy analysis, a multivariate ＂direct＂ gradient analysis, and its ordination axes were constrained to represent linear combinations with meteorological elements. The analysis was used to clarify the relationship between tree-ring width indexes at different elevations and climate factors during the period 1959–2009. Important findings Results indicated：（1） Tree ring chronologies from high altitudes were more superior than other samples in terms of growth-climate relationship, revealing that trees at high altitudes are more sensitive to climate variation than at low sites,（2） Tree growth was mainly affected by temperatures of from before and through growing season in previous year, especially in June and August. In comparison, tree growth in the low elevation was regulated by the combination of precipitation of August and Palmer drought severity index（PDSI） of September in current year,（3） Trees growing below timberline appeared to be more sensitive to climate warming; small extents of habitat heterogeneity or disturbance events beyond timberline may have masked theresponse, hence the optimal sites for examining growth trends as a function of climate variation are considered to be just below timberline, and（4） Redundancy analysis between the three chronologies and climate factors showed the same results as that of the correlation analysis and response function analysis, and this is in support of previous conclusion that redundancy analysis is also effective in quantifying the relationship between tre

关 键 词：海拔梯度 林线 长白落叶松(黄花落叶松) 冗余分析 树木年轮 

分 类 号：S791.22[农业科学—林木遗传育种]