生态学报2026，Vol.46Issue(8)：4326-4337,12.DOI:10.20103/j.stxb.202508112092
晋西北黄土丘陵区不同林龄柠条灌丛细根形态及化学性状特征
Morphological and chemical characteristics of fine roots under Caragana korshinskii shrubs at different ages in the loess hilly region of Northwest Shanxi
摘要
Abstract
Understanding the variation characteristics of fine root functional traits across different root orders of Caragana korshinskii shrubs at various stand ages is crucial for deeply understanding the ecological adaptation strategies of these plantations to their environment.Such knowledge also provides a theoretical foundation for enhancing ecosystem functions and maintaining the stability of Caragana shrub plantations.This study investigated C.korshinskii shrubs at six distinct stand ages(11,16,22,32,47,and 60 years)in Zhangjiaping Forest Farm,Wuzhai County,northwestern Shanxi Province.And the morphological and chemical functional traits of fine roots across different root orders were systematically analyzed.The key findings were as follows:(1)Fine root morphological traits,including root diameter,specific root length(SRL),specific surface area(SSA),and tissue density(RTD),varied with root order.Fine root diameter tended to increase with increasing root order,whereas SRL and SSA decreased.With increasing stand age,fine root(except for fourth-order roots)and RTD followed a unimodal pattern(initially increasing and then decreasing),whereas the SRL and SSA generated an opposite variation trend(first decreasing then increasing).(2)Fine root chemical traits-including root carbon(C),nitrogen(N),phosphorus(P),and potassium(K)concentrations,as well as C/N,N/P,and C/P ratios-also varied with root order.Root C concentration showed no significant variation across root orders.While the root N,P and K concentrations were consistently higher in first-to third-order roots than in fourth-to fifth-order roots.The C/N ratio increased progressively along the root order gradient.The N/P was generally higher in first-to third-order roots than in fourth-to fifth-order roots(except in the 32-year-old stand),while the opposite pattern was observed for C/P(except in the 16-and 22-year-old stands).With increasing stand age,C,N,and P concentrations in first-to fifth-order roots,decreased initially and then increased.The C/N ratio of 47-year-old C.korshinskii was significantly higher than other age classes,with no significant differences among the other ages.Both N/P and C/P ratios initially increased and then decreased with increasing stand age.(3)Correlation analysis indicated that fine root diameter of C.korshinskii shrubs showed significant negative associations with SRL and SSA,but positive correlated with RTD.Fine root N concentrations was significantly positively correlated with SSA,P concentration and N/P ratio,but significantly negatively correlated with C/N and C/P ratios.(4)Principal component analysis revealed that the variation in fine root functional traits of Caragana shrubs occurred mainly along two primary dimensions:.the first dimension(PC1)was mainly associated with fine-root morphological traits such as diameter and SRL,whereas the second(PC2)was characterized by chemical composition,including root carbon,nitrogen,and phosphorus concentrations.In general,the morphological and chemical functional traits of fine roots in C.korshinskii shrubs exhibited significant heterogeneity across both root orders and stand ages.These findings provide critical insights into the below-ground resource allocation strategies of C.korshinskii shrubs,and offer valuable references for the management and functional maintenance of these ecosystems.关键词
细根/林龄/形态性状/化学性状/柠条Key words
fine root/stand age/morphological characteristics/chemical characteristics/Caragana korshinskii引用本文复制引用
刘文栩,李雅妮,温海瑞,王佩将,梁海斌,李宗善,史建伟..晋西北黄土丘陵区不同林龄柠条灌丛细根形态及化学性状特征[J].生态学报,2026,46(8):4326-4337,12.基金项目
鄂尔多斯市科技重大专项项目(ZD20232324) （ZD20232324）
山西省基础研发计划项目(202403021211203) （202403021211203）
国家自然科学基金(42101104) （42101104）
山西省高等学校科技创新计划项目(2022L411) （2022L411）
