森林与环境学报2025，Vol.45Issue(3)：225-234,10.DOI:10.13324/j.cnki.jfcf.202410004
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
摘要
Abstract
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 the stem phloem(P<0.01).The results suggest that C,N,and P in the organs of Chinese fir seedlings with different drought tolerance are coordinated with each other through different strategies in response to the drought stress.The drought-tolerant Chinese fir has higher drought tolerance plasticity and stronger capability of adapting to environmental changes.关键词
杉木/干旱胁迫/根/茎/枝/叶/化学计量特征Key words
Cunninghamia lanceolata/drought stress/root/stem/branch/needle/stoichiometry characteristic分类
林学引用本文复制引用
郭文娟,张丽仙,郭嘉龙,陈宇龙,周丽丽,李树斌..干旱胁迫下不同耐旱型杉木幼苗碳氮磷化学计量特征[J].森林与环境学报,2025,45(3):225-234,10.基金项目
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) （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). （KFB23056）
