森林与环境学报2026，Vol.46Issue(2)：131-140,10.DOI:10.13324/j.cnki.jfcf.202507025
秦岭太白山南坡土壤有机碳分布海拔梯度效应及驱动因素
Altitude gradient effect and driving factors of soil organic carbon distribution on the south slope of Taibai Mountain in Qinling Mountains
摘要
Abstract
This study investigates the altitude gradient effect and driving factors of soil organic carbon(SOC)distribution on the southern slope of Taibai Mountain in Qinling Mountains,with sampling points established every 50 m along the altitudinal direction.Analysis of 0~10 cm surface soil data revealed that SOC content presented a distinct altitude-dependent increase,progressively decreasing from high-mountain areas[(108.2±46.89)g•kg-1]to mid-mountain areas[(96.72±65.02)g•kg-1]and low-mountain areas[(39.74±8.68)g•kg-1].The climatic zone also showed distinct differentiation,with SOC content exhibiting a pattern of subarctic zone>cold temperate zone>temperate zone.Vegetation belt effects were particularly evident,with SOC content ranking as alpine shrub meadows>alpine coniferous forests>birch forests>pine-oak mixed forests>sharp-toothed oak forests>mixed forests.Notably,SOC content decreased with the increase in soil depth,peaking in the 0-10 cm surface layer.Total soil depth also varied by altitude gradient,showing a pattern of high-mountain zone(32.90 cm)>low-mountain zone(23.13 cm)>mid-mountain zone(20.13 cm).SOC content per unit soil depth remained high in the mid-mountain zone,demonstrating a trend of mid-mountain zone(4.93 g•kg-•1 cm-1)>low-mountain zone(2.34 g•kg-•1 cm-1)>high-mountain zone(2.32 g•kg-•1 cm-1).In addition to altitude,climatic zone,vegetation belt,and soil layer depth,this study demonstrated that soil moisture(the primary contributor),soil temperature,and soil bulk density collectively drove the altitude gradient pattern of SOC content,with moisture being the key factor shaping carbon sink hotspots in mid-altitude regions.The findings indicate that on the southern slope of Taibai Mountain in the Qinling Mountains,soil moisture is the critical driver of the altitude-dependent pattern of SOC content,while the total soil layer depth shows no significant effect.This suggests that the carbon sink advantage in the mid-mountain zone is not attributable to soil layer depth but rather driven by the inherently high levels of SOC.关键词
土壤有机碳/土壤水分/海拔梯度效应/山地土壤碳循环/秦岭太白山南坡Key words
soil organic carbon/soil moisture/altitudinal gradient effect/soil carbon cycle in mountainous ecosystems/southern slope of Taibai Mountain in the Qinling Mountains分类
农业科技引用本文复制引用
李晶,张彦军,成爱芳,党水纳,李天姿..秦岭太白山南坡土壤有机碳分布海拔梯度效应及驱动因素[J].森林与环境学报,2026,46(2):131-140,10.基金项目
国家自然科学基金青年项目"土壤微生物群落结构调控太白红杉林凋落物呼吸温度敏感性的机理研究"(41801069). （41801069）
