干旱胁迫下不同耐旱型杉木幼苗碳氮磷化学计量特征  

Content and stoichiometry characteristics of C,N,and P in Cunninghamia lanceolata seedlings with different drought tolerance under drought stress

作　　者：郭文娟 张丽仙 郭嘉龙 陈宇龙 周丽丽 李树斌[1,2] GUO Wenjuan;ZHANG Lixian;GUO Jialong;CHEN Yulong;ZHOU Lili;LI Shubin(College of Forestry,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;Chinese Fir Engineering Research Center,National Forestry and Grassland Administration,Fuzhou,Fujian 350002,China;College of JunCao Science and Ecology(College of Carbon Neutrality),Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;College of Resources and Environment,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;College of Geography and Oceanography,Minjiang University,Fuzhou,Fujian 350108,China)

机构地区：[1]福建农林大学林学院,福建福州350002 [2]国家林业草原杉木工程技术研究中心,福建福州350002 [3]福建农林大学菌草与生态学院(碳中和学院),福建福州350002 [4]福建农林大学资源与环境学院,福建福州350002 [5]闽江学院地理与海洋学院,福建福州350108

出　　处：《森林与环境学报》2025年第3期225-234,共10页Journal of Forest and Environment

基　　金：国家自然科学基金项目“基于植物栓塞理论的不同地理类型杉木耐旱机制研究”(32001306);福建农林大学科技创新专项基金项目“干旱胁迫下不同耐旱型杉木的水分平衡-碳代谢差异”(KFB23056)。

摘　　要：以两种耐旱型(敏感型和忍耐型)杉木幼苗为研究对象,通过室内盆栽试验,设置正常水分(对照)和干旱胁迫处理(分别为田间持水量的70%~80%和40%~50%),研究干旱胁迫对敏感型和忍耐型杉木幼苗各器官C、N、P含量及其化学计量分配格局的影响。结果表明,与对照相比,干旱胁迫下敏感型杉木N、P含量在细根、粗根韧皮部中增加,在枝木质部和叶中减少;忍耐型杉木N、P含量在叶中增加,在细根、粗根韧皮部、茎和枝韧皮部减少。敏感型杉木细根C/N、C/P、N/P减小,枝木质部和叶N/P增大,忍耐型杉木呈相反趋势。干旱胁迫下忍耐型杉木细根、粗根(木质部和韧皮部)、枝韧皮部及叶N、P含量变异性均高于敏感型,但敏感型和忍耐型杉木幼苗大部分器官(除茎木质部和枝韧皮部之外)N/P平均值>16,杉木生长可能更受P限制。相关分析表明,杉木各器官元素之间具有耦合性,而干旱胁迫导致这种耦合关系发生变化,如敏感型杉木细根C、P含量和C/P、N/P与叶、茎韧皮部、枝(木质部和韧皮部)呈极显著负相关(P<0.01),忍耐型杉木细根C、N、P含量和C/N、C/P、N/P与粗根韧皮部,细根C/N、C/P、N/P与茎韧皮部均呈极显著正相关(P<0.01)。研究表明不同耐旱型杉木幼苗各器官中C、N、P元素通过不同的策略彼此协调以适应干旱环境,忍耐型杉木具有更高的耐旱可塑性,适应环境变化的能力更强。Pot experiments were conducted for drought-tolerant and drought-sensitive Chinese fir(Cunninghamia lanceolata)seedlings(2 years old)under normal water and drought stress(70%-80%and 40%-50%of the water holding capacity in the field,respectively)conditions to investigate the effects of drought stress on the content and stoichiometric partitioning patterns of C,N,and P in the seedlings.The results showed that compared with those in the normal water treatment,the drought-sensitive seedlings under drought stress showed increased N and P content in the fine roots and coarse root phloem and decreased N and P content in the branch xylem and needles,whereas the drought-tolerant seedlings showed increased N and P content in needles and decreased N and P content in fine roots,coarse root phloem,stem phloem,and branch phloem.The drought-sensitive seedlings showed decreased C/N,C/P,and N/P ratios in the fine roots and increased N/P ratio in branch xylem and needles,while the opposite trend was observed in the drought-tolerant seedlings.The variability of N and P in fine roots,coarse roots(xylem and phloem),branch phloem,and needles of drought-tolerant seedlings under drought stress was higher than that of drought-sensitive seedlings.The N/P ratio>16 in many organs(except stem xylem and branch phloem)of both drought-sensitive and drought-tolerant seedlings indicated that the seedling growth was mainly restricted by P.The results of correlation analyses showed that there were couplings between the elements of various organs,and drought stress led to changes in this coupling relationship.For example,in drought-sensitive seedlings,the C and P content and the C/P and N/P ratios in fine roots were negatively correlated with those in the leaves,stem xylem,and branches(xylem and phloem)(P<0.01).In drought-tolerant seedlings,the C,N,and P content and the C/N,C/P,and N/P ratios in fine roots were positively correlated with those in coarse root phloem,and the C/N,C/P,and N/P ratios in fine roots were positively correlated with those in

关 键 词：杉木 干旱胁迫 根 茎 枝 叶 化学计量特征 

分 类 号：S791.27[农业科学—林木遗传育种]