文献类型：期刊文献

中文题名：川西亚高山岷江冷杉与川滇冷杉径向生长的大气水热变化响应和干旱适应策略

英文题名：Atmospheric hydrothermal response and drought adaptation strategies of radial growth in Abies fargesii var.faxoniana and Abies forrestii in subalpine western Sichuan,China

作者：孙镇[1,2] 刘顺[1,2] 陈健[1,2] 史作民[1,2,3] 冯哲[1,2] 许格希[1,2] 贾磊[1,2] 余美霓[1,2]

第一作者：孙镇

机构：[1]中国林业科学研究院森林生态环境与自然保护研究所国家林业和草原局森林生态环境重点实验室,北京100091;[2]中国林业科学研究院森林生态环境与自然保护研究所四川米亚罗森林生态系统定位观测研究站,阿坝藏族羌族自治州623100;[3]南京林业大学南方现代林业协同创新中心,南京210037

年份：2026

卷号：46

期号：2

起止页码：983-996

中文期刊名：生态学报

外文期刊名：Acta Ecologica Sinica

收录：;北大核心:【北大核心2023】；

基金：国家重点研发计划项目(2023YFD2200404-03,2021YFD2200405);中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2021ZA002-2,CAFYBB2022QC002)。

语种：中文

中文关键词：水热变化;干旱适应策略;抵抗力;恢复力;岷江冷杉;川滇冷杉

外文关键词：hydrothermal changes;drought adaptation strategy;resistance;recovery;Abies fargesii var.faxoniana;Abies forrestii

分类号：S791.14

摘要：气候变化导致高海拔树木生长与大气水热条件的关系更加复杂,树木生长对水热变化响应与干旱适应性的认识仍然不足。为此,以四川省西北部的岷江冷杉和西南部的川滇冷杉为研究对象,利用树木年轮学方法提取树木的径向生长数据,将其与气候因子建立联系,探究树木径向生长对水热条件的响应。同时,量化其在极端干旱年的抵抗力与恢复力,分析树木对干旱事件的适应特征与策略。结果表明:1970—2010年间西北部干旱加剧(标准化降水蒸散指数(SPEI)下降速率0.02/a)而岷江冷杉生长速率保持稳定,西南部水分改善(SPEI上升速率0.02/a)伴随川滇冷杉生长速率显著提升(增速0.03/a)。两树种的径向生长均与冬季(上年10月—当年2月)温度和生长季(当年5月—9月)水热条件显著相关(P<0.05)。川滇冷杉在更强干旱胁迫(平均SPEI=-1.63)下保持与岷江冷杉(平均SPEI=-1.36)相当的抵抗力以及相对较低的恢复力,相比之下,二者分别呈现“高抗性-低恢复”和“低抗性-高恢复”的适应策略,且岷江冷杉抗性-恢复的线性权衡关系(k=-0.9)比川滇冷杉(k=-0.26)更接近完全恢复弹力线。冬季温度和生长季水热平衡共同驱动了树木的径向生长,然而极端干旱事件可能重塑树木的适应策略,进而影响其长期的生长动态。研究结果为高海拔森林适应性管理提供更精准的理论支撑。
Under the context of climate change,the relationship between high-altitude tree growth and atmospheric hydrothermal conditions became increasingly complex,while our understanding of tree growth responses to hydrothermal variations and drought adaptation strategies remained insufficient.The subalpine region of western Sichuan,as a critical component of the eastern Tibetan Plateau and a key water conservation area in the upper Yangtze and Yellow River basins,provides an ideal area for studying tree growth-climate relationships.To address this research gap,we analyzed radial growth data from Abies fargesii var.faxoniana at 6 sites in northwestern Sichuan and Abies forrestii at 4 sites in southwestern Sichuan using dendrochronological methods with 514 tree-core samples.After confirming chronology robustness based on key statistical parameters of tree-ring chronology(expressed population signal>0.85),we established correlations via Pearson analysis with climatic factors to investigate growth responses to atmospheric hydrothermal conditions,integrated SPEI with tree-growth trends to define and identify 18 past extreme drought events across these sites,and quantified tree resistance and recovery during these events to assess adaptive strategies.The results demonstrated that:From 1970 to 2010,drought intensified in the northwest(SPEI declined at 0.02/a)while A.fargesii var.faxoniana maintained stable growth rates;in contrast,moisture improved in the southwest(SPEI increased at 0.02/a)with significant growth acceleration in A.forrestii(growth rate increased by 0.03/a),suggesting long-term water balance dictates growth trends.Radial growth of both species was significantly correlated(P<0.05)with winter temperatures(October-February)and growing-season hydrothermal conditions(May-September),particularly minimum temperature and diurnal temperature range,indicating these as key limiting factors.Under stronger drought stress(mean SPEI=-1.63),A.forrestii exhibited resistance comparable to A.fargesii var.faxoniana(mean SPEI=-1.36)but significantly lower recovery(P<0.001),with only 35.8%of individuals achieving line of full resilience within 4 years versus 58.2%for A.fargesii var.faxoniana,reflecting distinct“high resistance-low recovery”and“low resistance-high recovery”strategies.The linear resistance-recovery trade-off of A.fargesii var.faxoniana(k=-0.9)approached closer to the line of full resilience than that of A.forrestii(k=-0.26),implying increased drought severity disrupts species-specific trade-off balances.Winter temperatures and growing-season hydrothermal balance jointly drove radial growth,yet extreme droughts reshaped adaptation strategies,particularly under asymmetric diurnal warming,thereby influencing long-term growth dynamics.Consequently,this comparative study on the two Abies species(A.fargesii var.faxoniana and A.forrestii)in western Sichuan provides a species-specific theoretical foundation for precision adaptive management of high-altitude forests under climate change.