生态学报2026，Vol.46Issue(4)：2024-2035,12.DOI:10.20103/j.stxb.202503190620
石质山地主要树种根序功能性状分异的生态适应策略
Ecological adaptations of functional trait differentiation among root orders in major tree species of rocky mountainous areas
摘要
Abstract
Seven functional traits across two groups of root orders(first-to third-order and fourth-to fifth-order roots)were measured in this study to analyze their variations along different rock-fragment-content(RFC)gradients.The objective was to explore fine-root trait plasticity and adaptive strategies of ornamental tree species in rocky mountainous environments.The results showed that:(1)With increasing RFC,the specific root surface area(SRA)and specific root length(SRL)of first-to third-order roots significantly decreased,while root diameter(RD),root tissue density(RTD),and root carbon content(RCC)significantly increased.In contrast,fourth-to fifth-order roots exhibited the opposite trend—their resource absorption capacity improved with higher gravel content.(2)Across the rock-fragment content gradient,root traits diverged along two dimensional axes:PC1(accounting for 49.04%of total variation)represented a"collaborative"gradient(associated with RD and SRA),while PC2(18.08%of variation)reflected a resource acquisition-conservation trade-off,linked to RTD and root nitrogen content(RNC).1st—3rd order roots were primarily correlated with PC2,while 4th—5th order roots showed higher loadings on PC1.(3)Trait network complexity increased with RFC,characterized by stronger inter-trait correlations and connectivity in high-gravel environments.Additionally,the trait network of 1st—3rd order roots was more complex than that of 4th—5th order roots.Overall,these findings highlight divergent functional strategies:1st—3rd order roots adopt a"do-it-yourself"resource acquisition strategy,while 4th—5th order roots favor an"outsource"strategy involving collaboration with mycorrhizal fungi.In rocky environments,functional shifts occur across root orders,and ornamental trees may gain an advantage by developing thicker lower-order roots and finer higher-order roots.These findings enhance our understanding of plant survival strategies in rocky soils and provide a theoretical basis for the sustained growth of trees in gravel-rich mountainous regions.关键词
石质山地/根序/根系功能性状/根系经济谱/适应策略Key words
rocky mountainous areas/root orders/root functional traits/root economic spectrum/adaptive strategies引用本文复制引用
韦柳端,于淼,林建,杨智慧,董天心,户佐佑,姜文珊,徐程扬..石质山地主要树种根序功能性状分异的生态适应策略[J].生态学报,2026,46(4):2024-2035,12.基金项目
国家自然科学基金(32271832) （32271832）
北京林业大学"5·5工程"科研创新团队项目(BLRC2023B06) （BLRC2023B06）
