文献类型：期刊文献

中文题名：夏季高温干旱不同白栎家系叶片碳氮磷化学计量比与非结构性碳水化合物变异特征

英文题名：Variation in leaf C-N-P stoichiometric ratio and non-structural carbohydrates among Quercus fabri families under summer heat-drought stress

作者：练慧雯[1,2] 蒋承钢[1] 汪阳东[1] 吴立文[1] 熊仕发[1] 方宏峰[3] 王斌[3] 施翔[1]

第一作者：练慧雯

机构：[1]中国林业科学研究院亚热带林业研究所全省林木育种重点实验室,杭州311400;[2]南京林业大学,南京210000;[3]安吉县龙山林场,安吉313306

年份：2026

卷号：46

期号：5

起止页码：2668-2682

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(2021YFD2200302);浙江省“十四五”育种专项林木协作组课题(2021C02070-9)。

语种：中文

中文关键词：白栎;气候变化;夏季高温干旱;碳氮磷化学计量比;非结构性碳水化合物

外文关键词：Quercus fabri;climate change;heat-drought stress in summer;carbon,nitrogen,phosphorus stoichiometric ratio;non-structural carbohydrates

分类号：S792.184

摘要：2022年夏季,东南沿海地区遭遇罕见的气象水文干旱。为探究白栎(Quercus fabri)对气候变化的适应潜力及其不同家系对夏季高温干旱的响应差异,以27个3年生白栎家系为研究对象,基于叶片碳(C)、氮(N)、磷(P)化学计量比及非结构性碳水化合物(NSC)的变异特征,解析不同家系的资源分配策略,进而评估其应对高温干旱的响应模式。结果表明:夏季高温干旱胁迫下,白栎叶片N含量及C、N、P化学计量比和NSC含量及其组成成分在家系间差异显著(P<0.05)。对白栎叶片C、N、P含量及其化学计量比和NSC含量及其组成成分进行聚类分析和主成分分析,27个白栎家系被划分为A、B、C、D共4个类群。其中A类群表现出较强的抗高温干旱能力(主成分综合得分最高),该类群家系叶片N、P含量相对较低,但C∶N、C∶P和NSC含量高。总体上,白栎叶片C含量与N、P含量呈现显著正相关(P<0.05),而NSC含量与N、P含量呈极显著负相关(P<0.01)。值得注意的是,上述元素与NSC的关联特征在总体和不同类群间表现出明显的差异,这为揭示不同白栎家系在高温干旱胁迫下的资源分配策略分化提供了关键线索。此外,种源环境是白栎在高温干旱胁迫下存在养分分配策略多态性的原因之一。总体而言,不同白栎家系在高温干旱胁迫下具有多样化的适应性策略,其中采用低生长+高NSC积累策略的家系具有最强的抗逆性,这可能使其在未来气候变化的背景下在亚热带地区具有较强的竞争力。
During the summer of 2022,southeastern coastal China experienced an unprecedented meteorological and hydrological drought.To investigate the adaptive potential of Quercus fabri to climate change and the divergent responses among its families to heat-drought stress in summer,we took 27 three-year-old Q.fabri families as research subjects.Based on the variation characteristics of leaf carbon(C),nitrogen(N),phosphorus(P)stoichiometric ratios and non-structural carbohydrate(NSC)content,the resource allocation strategies of different families were analyzed to further evaluate their response patterns to high-temperature and drought conditions.The results showed that:Significant variation occurred in leaf N content,C∶N∶P ratios,and NSC content(including its components)among families.Based on cluster analysis and principal component analysis(PCA),27 Q.fabri families were classified into four distinct groups(A,B,C,D).Group A(GX1,GZ1,GZ21,HN3,CQ5,HB11,HN4,SC2,SC9)exhibited superior heat-drought tolerance,which was characterized by lower leaf N and P concentrations but higher C∶N and C∶P ratios,as well as elevated NSC content.At the general level(27 families),leaf C content showed significant positive correlations with N and P(P<0.05),while NSC content was negatively correlated with N and P(P<0.01).Notably,the association characteristics between these elements(C,N,P)and NSC exhibited significant differences between the overall and taxonomic levels(cluster-defined groups),providing critical clues for understanding the divergence in resource allocation strategies among different Q.fabri families under combined heat and drought stress.Furthermore,provenance-specific environmental conditions contributed to the observed polymorphism in resource allocation strategies among Q.fabri families under stress.Overall,different Q.fabri families exhibit diversified adaptive strategies under combined heat-drought stress,among which the low-growth+high-NSC accumulation strategy demonstrates the stronger stress resistance.This trait combination may confer enhanced competitiveness in subtropical regions under future climate change scenarios.