北京东灵山辽东栎林树木生长对气候要素的响应特征  

Tree-ring growth responses of Liaodong Oak(Quercus wutaishanica)to climate in the Beijing Dongling Mountain of China

作　　者：李宗善 陈维梁[1,2] 韦景树 买尔当·克依木 张育新 张霜[1] 王晓春 LI Zongshan;CHEN Weiliang;WEI Jingshu;MAIERDANG Keyimu;ZHANG Yuxin;ZHANG Shuang;WANG Xiaochun(State Key Laboratory of Urban and Regional Ecology,Research Center for Eco-Environmental Science,Chinese Academy of Sciences,Beijing 100085,China;University of Chinese Academy of Sciences,Beijing 100049,China;College of Forestry,Northeast Forestry University,26 Hexing Road,Harbin 150040,China)

机构地区：[1]中国科学院生态环境研究中心城市与区域生态国家重点实验室,北京100085 [2]中国科学院大学,北京100049 [3]东北林业大学生态研究中心,哈尔滨150040

出　　处：《生态学报》2021年第1期27-37,共11页Acta Ecologica Sinica

基　　金：国家重点研发计划项目(2016YFC0501602);国家自然科学家基金(31971481)。

摘　　要：根据北京东灵山辽东栎(Quercus wutaishanica)的年轮宽度资料,分析了该地区树木生长在1951—2010年时段对气候要素的响应特征。相关分析表明,夏季干旱胁迫是限制东灵山辽东栎树木生长的最为重要的气候要素,主要体现在与夏季(7—9月)温度的负相关关系和夏季降雨(7月)的正相关关系,另外春季(5月)温度对树木生长也有一定的限制性影响;年表与生长季节干旱指数普遍呈正相关关系,进一步证实了干旱胁迫对树木生长的限制性作用。滑动相关分析表明,年表与夏季温度负相关关系及与夏季降雨的正相关关系在近期趋于增强,这表明夏季干旱胁迫对树木生长影响作用有不断加强的趋势。辽东栎林是北京东灵山温带落叶阔叶林的优势群落,在暖干化气候不断发展背景下,辽东栎林生长的干旱胁迫效应将更加突出,对北京东灵山地区森林的生产力及固碳能力产生负面影响。Based on tree-ring width data of Quercus wutaishanica forest in Beijing Dongling Mountain,we detected response sensitivity of radial growth to local climate variables during the overlap period(1951—2010)between tree ring and climate data.Correlation analysis indicated that yearly growth was strongly correlated with summer temperature(from July to September)and precipitation(July),indicating summer drought stress was the major constraint for tree growth.Tree radial growth was also positively correlated with growing season(from April to October)Palmer Drought Severity Index(PDSI),further confirming high sensitivity of tree growth to moisture condition.Additionally,climate condition in spring had a partial influence on tree growth,representing the significantly negative correlation with May temperature.Moving correlation analysis revealed that the relationship between tree rings and summer temperature(negative)and precipitation(positive)has become strengthened in the recent years.This predominantly show that the influence of summer drought stress on radial growth becomes more evident recently.Climate change models predict higher temperatures and increasing drought stress in the study area.The elevated dry climate will increasingly threaten Q.wutaishanica forest growth,allowing a downward trend in Net Primary Production(NPP),and the weakened ability of terrestrial carbon sink of local forests should be expected.

关 键 词：树木年轮 气候响应 干旱胁迫 北京东灵山 

分 类 号：S792.18[农业科学—林木遗传育种]