生态学报2025，Vol.45Issue(18)：8885-8899,15.DOI:10.20103/j.stxb.202408282049
不同野生种杜鹃群落土壤磷素组分和真菌结构特征及其相关关系
Correlation between soil phosphorus fraction and fungal structure characteristics of Rhododendron L. communities
摘要
Abstract
Phosphorus(P)plays a vital role in the growth and development of vegetation.However,P limitation is commonly observed in subtropical forest ecosystems.Rhododendron L.is a typical representative of subtropical subalpine flora.Sustaining the stability and diversity of subalpine Rhododendron L.communities has become urgent in addressing the challengs of global climate change and protecting ecosystem integrity.This study was conducted in Daweishan National Forest Park in Liuyang City,Hunan Province.Rhizosphere soil samples,non-rhizosphere soil samples,and plant fine root samples were collected from three wild Rhododendron L.communities:Rhododendron latoucheae Franch.,Rhododendron fortunei Lindl.,and Rhododendron simsii Planch..The Hedley phosphorus fractionation method was used to analyze soil P fractions,and further determined the characteristics of soil phosphorus fractions and fungal communities of these samples and explored their correlation.The results showed the distinct difference of P fractions in three Rhododendron L.communities.In Rhododendron simsii Planch.,both the lowest H2O-Pi content(1.65±0.112)and the highest Residual-Pt content(396.03±10.254)in rhizosphere soil were found.The acid phosphatase activity of Rhododendron simsii Planch.had extremely significant difference between rhizosphere soil and non-rhizosphere soil(P＜0.01),and was significantly higher than that of Rhododendron latoucheae Franch.and Rhododendron fortunei Lindl.(P＜0.05).Additionally,the relative abundance of pathotrophs in rhizosphere soil was significantly higher than Rhododendron latoucheae Franch.and Rhododendron fortunei Lindl.,especially the abundance of fungal parasite(P＜0.05).In Rhododendron fortunei Lindl.,the highest contents of labile inorganic P and moderately labile inorganic P were found in rhizosphere soil,including H2O-Pi,NaHCO3-Pi,and NaOH-Pi contents(H2O-Pi:6.22±1.366,P＜0.05;NaHCO3-Pi:7.45±2.401;NaOH-Pi:54.65±8.376).At the Phylum level,Ascomycota and Basidiomycota were dominant in three Rhododendron L.communities.NMDS analysis revealed fungal community structure had an extremely significant difference between in rhizosphere soil and in the fine roots(P=0.001).Mantel results showed that soil pH and NO3-N drove the distribution of P fractions,and soil organic carbon and nutrient elements affected the abundance of fungal communities.Three wild Rhododendron L.communities exhibit different soil P-activating mechanisms.Rhododendron simsii Planch.mainly mineralizes soil organic P by promoting the activity of acid phosphatase,and Rhododendron fortunei Lindl.primarily relies on exudation(e.g.organic acids)from fine roots and the related fungi to dissolve insoluble inorganic P.Additionally,the stand structure influenced the characteristic of functional taxa.The Rhododendron simsii Planch.at the summit is dominated by shrubs and exhibits a single-stand structure,which hinder the communitity development and further exacerbate vegetation functional degradation over time.Overall,this research has focused on the relationship between soil P fractions and the fungal communities,aiming to provide data and theoretical support for maintaining the stability and diversity of subalpine Rhododendron communities.关键词
杜鹃/土壤磷组分/真菌群落/结构/多样性Key words
Rhododendron L./soil phosphorus fraction/fungal community/structure/diversity引用本文复制引用
林榆雯,易心钰,廖菊阳,朱凡,吴林世,刘艳,初斌,王玲,陈婵,李巧云..不同野生种杜鹃群落土壤磷素组分和真菌结构特征及其相关关系[J].生态学报,2025,45(18):8885-8899,15.基金项目
湖南省自然科学基金项目(2024JJ5235,2023JJ40396,2024JJ6283) （2024JJ5235,2023JJ40396,2024JJ6283）
湖南省林业科技创新项目(XLKY202313) （XLKY202313）
