Elevational variation in anatomical traits of the first-order roots and their adaptation mechanisms  

作　　者：Xue Wang Xinrui Liu Shuang Chen Jiang Zhu Yanqi Yuan Rong Zhu Kaixi Chen Xue Yang Xiaochun Wang Weiyi Mo Ruili Wang Shuoxin Zhang 

机构地区：[1]College of Forestry,Northwest A&F University,Yangling 712100,Shaanxi,China [2]Qinling National Forest Ecosystem Research Station,Huoditang,Ningshan 711600,Shaanxi,China

出　　处：《Plant Diversity》2025年第2期291-299,共9页植物多样性(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.32271611);Functional traits of plant communities at different elevation gradients in the Taibai Mountain of Qinling Mountains financed by the Ministry of Science and Technology of China(No.2016YFC0500202);245 Qinling National Forest Ecosystem Research Station in 2022 financed by Ministry of Education of China.

摘　　要：Root anatomical traits play an important role in understanding the link between root physiological function and ecological process.To determine how plants change root anatomical traits to adapt to distinct environments,we measured four key root anatomical traitsdstele diameter(SD),cortex thickness(CT),root diameter(RD),and the stele to root diameter ratio(SDRD)dof first-order roots of 82 species collected from different vegetation zones along a 2000 m altitudinal gradient on the northern slope of Taibai Mountain.Compared with other altitudes,plants located in temperate birch and fir forests had thinner SD,CT,RD,and SDRD.We found that elevational variation in root anatomical traits could largely be explained by phylogenetic taxonomy(clade).In addition,changes in SD were driven by soil bulk density,whereas variations in CT and RD were influenced by soil available nitrogen.When phylogenetic factors were removed from our analysis,allometric relationships between RD and root anatomical traits(SD and CT)were observed across different altitudes.Our study reveals the influence of phylogeny and environment on the elevational variation in root anatomical traits and further supports the allometric relationship between root anatomical traits(SD and CT)and RD.These findings enhance our understanding of the evolutionary and adaptive mechanisms of root anatomical structures,providing a basis for predicting how root anatomical traits respond to global changes.

关 键 词：Allometric relationship ALTITUDE PHYLOGENY Root anatomical traits Stressful environment 

分 类 号：S51[农业科学—作物学]