生态学杂志2024，Vol.43Issue(11)：3333-3340,8.DOI:10.13292/j.1000-4890.202411.022
亚热带丛枝和外生菌根森林土壤酸缓冲性能及其主要影响因素
Soil acid buffering capacity of subtropical arbuscular and ectomycorrhizal forests and its main influencing factors
摘要
Abstract
Soil acid buffering capacity plays an important role in preventing soil acidification induced by fertilization and atmospheric nitrogen deposition,and thus is critical for maintaining soil functioning.Arbuscular mycorrhizal(AM)and ectomycorrhizal(ECM)plants differ greatly in functional traits,but how the differences of their impacts on soil acid buffering capacity are still poorly understood.In this study,forests with dominant tree species associat-ed with AM and ECM fungi in subtropical China were selected,aiming to investigate soil acid buffering capacity and the relevant physicochemical properties of forest soils.The results showed that AM-dominated forest soils had significantly higher soil acid buffering capacity than ECM-dominated forest soils.In comparison,pH,exchangeable base cations,cation exchange capacity,exchangeable K+,Na+,Ca2+,organic matter and nitrate concentrations were significantly higher in AM-dominated forest soils,but ammonium concentrations were lower than ECM-domina-ted forest soils(P＜0.01).Soil acid buffering capacity was positively correlated with pH,soil organic matter,exchangeable calcium,cation exchange capacity and base saturation(P＜0.01),the exchangeable base cations and exchangeable magnesium(P＜0.05),while it was significantly negatively correlated with the exchangeable acid content(P＜0.01).In addition,47.4％of the variation in soil acid buffer capacity could be explained by the con-tents of exchangeable calcium and organic matters.Therefore,AM tree species can improve soil acid buffering abili-ty by promoting accumulation of organic matters and exchangeable base cations(mainly Ca2+)in soils.Moreover,AM-dominated forests could prevent soil acidification better than ECM-dominated forests in subtropical regions when exposed to chronic atmospheric nitrogen deposition.关键词
土壤酸化/盐基离子/菌根类型Key words
soil acidification/exchangeable base cation/mycorrhizal type引用本文复制引用
李静,夏尚光,石晓芸,孙庆业,赵琼..亚热带丛枝和外生菌根森林土壤酸缓冲性能及其主要影响因素[J].生态学杂志,2024,43(11):3333-3340,8.基金项目
安徽省重点研发计划项目(2022107020001)、安徽省林业科研创新项目(2024-20)和国家自然科学基金项目(41877341)资助. （2022107020001）
