亚热带杉木径向生长对气候因子的响应  

Response of stem radial growth of Cunninghamia lanceolata to climatic variables in the subtropic region

作　　者：林小乔 许玲玲 刘沛荣 同小娟[1] 张静茹 张劲松[2,4] 李俊 孟平[2,4] LIN Xiaoqiao;XU Lingling;LIU Peirong;TONG Xiaojuan;ZHANG Jingru;ZHANG Jinsong;LI Jun;MENG Ping(School of Ecology and Nature Conservation,Beijing Forestry University,Beijing 100083,China;Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration,Research Institute of Forestry,Chinese Academy of Forestry,Beijing 100091,China;Key Laboratory of Water Cycle and Related Land Surface Processes,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China;Henan Xiaolangdi Earth Critical Zone National Research Station on the Middle Yellow River,Jiyuan 454650,China)

机构地区：[1]北京林业大学生态与自然保护学院,北京100083 [2]中国林业科学研究院林业研究所,北京100091 [3]中国科学院地理科学与资源研究所陆地水循环及地表过程重点实验室,北京100101 [4]河南黄河小浪底关键带国家野外科学观测研究站,济源454650

出　　处：《生态学报》2024年第4期1633-1646,共14页Acta Ecologica Sinica

基　　金：国家重点研发计划(2020YFA0608101);国家自然科学基金(32271875,31872703)。

摘　　要：杉木(Cunninghamia lanceolata)是亚热带地区主要造林树种之一,其在区域碳循环和缓解气候变化中起着重要的作用。以亚热带地区6个站点(荆关、马鬃岭、分宜、将乐、东风、高峰)杉木人工林为研究对象,建立树轮标准化年表,分析树木年轮年表与气候因子的关系,解析不同研究区杉木径向生长对气候变化的响应机制,探讨不同站点杉木对干旱事件的响应策略,为该地区杉木人工林的经营管理提供理论依据。研究结果表明,6个研究区杉木树轮宽度对气候变化的平均敏感度大于0.15,样本总体代表性大于0.85,均处于可接受水平,表明6个站点的杉木样本具有区域代表性,适用于进行气候相关分析。杉木径向生长主要与生长季的平均温度和降水量、上一年夏季的最低温度正相关,与当年夏季最高温度负相关,高峰站点的径向生长与7-10月的相对湿度显著正相关,其他地点径向生长与月相对湿度相关性较弱,分宜、东风和高峰站的径向生长与干旱指数显著正相关,其他地点的杉木树轮宽度与干旱指数相关性较弱。干旱事件对6个站点杉木生长均产生了负面影响,胸高断面积增长(Basal area increment, BAI)呈先上升后下降的趋势,在生长后期,6个研究点的BAI出现不同程度的衰退现象。第二次干旱发生后,杉木对干旱事件的应对能力更强。亚热带纬度较低的地区杉木受到干旱的影响较大,温暖而湿润环境下的杉木对干旱事件的抵抗力较小,恢复力较高。Cunninghamia lanceolata is one of the main afforestation tree species in the subtropical region,which plays an important role in regional carbon cycle and mitigating climate change.We established the tree-ring standardized chronology of Cunninghamia lanceolata at 6 sites(including JG,MZL,FY,JL,DF,and GF)in the subtropical region.The relationship between tree ring chronology and climate factors and the response mechanisms of radial growth of Cunninghamia lanceolata to climate change were analyzed.We also explored the response strategies of Cunninghamia lanceolata to drought events at different sites.This study will provide theoretical basis for the management of plantation in the subtropical region.The results showed that mean sensitivity(MS)of tree growth to climate change in the six study areas was greater than 0.15,and the expressed population signal(EPS)was greater than 0.85,all of which were at acceptable levels.It is indicated that the radial growth at six sites was regionally representative and suitable for climate related analysis.The radial growth was positively correlated with mean temperature and precipitation during the growing season and the minimum temperature in summer of last year,while it was significantly negatively correlated with the maximum temperature.Radial width index(RWI)of the GF site was significantly positively correlated with relative humidity(RH)from July to October,but other locations had poor correlations with monthly RH.At FY,DF,and GF sites,RWI was significantly correlated with drought index and had a weak relationship with drought index at other sites.Drought events exerted negative effects on tree growth,and the basal area increment(BAI)of Cunninghamia lanceolata in the 6 study areas showed a rising trend firstly and then decreased.The BAI presented different declines at the later growing stage.After the second drought,trees were more resilient to drought events.Trees at lower latitudes were more affected by drought and prone to have less resistance and higher resilience to drou

关 键 词：杉木 径向生长 气候变化 干旱事件 

分 类 号：S71[农业科学—林学]