生态学杂志2026，Vol.45Issue(8)：2531-2540,10.DOI:10.13292/j.1000-4890.202608.021
天山雪岭云杉不同序级细根性状沿海拔的变化特征
Altitudinal variations in fine-root traits of different root branch orders of Picea schrenkiana in the Tianshan Mountains
摘要
Abstract
Fine-root morphological and stoichiometric traits are key regulators of plant nutrient use strategies.How-ever,altitudinal variations in these traits and their trade-offs in Picea schrenkiana remain poorly documented.In this study,fine-root samples of P.schrenkiana were collected by excavation at four altitudes(1800,2100,2400,and 2700 m)in the Tianshan Mountains.Morphological and stoichiometric traits of different root orders were measured.We investigated the variations in root diameter(RD),specific root length(SRL),specific root area(SRA),root tissue density(RTD),and carbon(C),nitrogen(N),and phosphorus(P)concentrations and ratios(C:N,C:P,N:P)of different root orders across altitude levels to elucidate the resource acquisition strategies.The re-sults showed that:(1)Altitude and root order significantly influenced the morphological traits of fine roots(P＜0.01).RD and SRL of the same root order generally increased with altitude,whereas SRA and RTD exhibited a unimodal pattern,peaking at mid-altitudes.At a given altitude,RD and RTD increased with increasing root order,while SRL and SRA decreased.(2)Altitude and root order significantly affected fine-root C,N,and P concentra-tions and ratios(P＜0.01).With increasing altitude,C content in absorptive roots(orders 1-3)increased,while that in transport roots(orders 4-5)remained stable.The N content and N:P ratio in both root functional catego-ries followed a unimodal pattern,contrasting with the trend of C:N ratio.The P content increased with altitude,whereas C:P ratio decreased.Absorptive roots generally had higher N and P contents but lower C content,C:N,and C:P than transport roots.(3)Functional traits of P.schrenkiana fine roots revealed two primary dimensions of ecological strategy variation across altitudes:"do-it-yourself versus outsourcing"and"resource acquisition versus conservation",with distinct strategic preferences at different altitudes.关键词
细根/序级/性状/海拔/云杉森林Key words
fine root/root order/trait/altitude/spruce forest引用本文复制引用
赵蕊,常顺利,何爱琳,孙雪娇,张毓涛..天山雪岭云杉不同序级细根性状沿海拔的变化特征[J].生态学杂志,2026,45(8):2531-2540,10.基金项目
新疆维吾尔自治区自然科学基金项目(2022D01B174)资助. （2022D01B174）
