摘要
【目的】揭示不同群落类型中玉蕊叶片及根际土壤中矿质元素含量的变化规律,并分析矿质元素与土壤因子的相关性,为不同群落中玉蕊个体生长的科学管理和保护提供依据。【方法】选取湛江市遂溪县官田村调丰河河畔的玉蕊纯林群落(T1)、卤蕨-玉蕊混生群落(T2)和无瓣海桑-玉蕊混生群落(T3)为研究对象。测定不同群落的土壤理化性质、玉蕊的生长状况(树高、胸径)、叶片和根际土壤中的矿质元素含量,并采用主成分分析(PCA)探讨玉蕊叶片与土壤矿质元素之间的关系及其在不同群落中的差异。【结果】1)不同玉蕊群落土壤的理化性质及矿质元素差异显著。T2和T3群落土壤的pH值、盐度及有效钾(AK)含量显著高于T1群落(P<0.05),T3群落土壤的有机碳、全氮(TN)、全钾(TK)、Ca和Fe含量均显著高于T1、T2群落(P<0.05);2)不同群落土壤的矿质元素显著影响玉蕊的生长表现。T1纯林群落的玉蕊叶片在全磷(TP)、Na、Fe和Mn含量上表现最优,株高和胸径显著高于T2和T3群落,表明较低的种间竞争压力是T1群落玉蕊生长优势的主要原因;3)主成分分析(PCA)显示,PC1(贡献率69.04%)和PC2(贡献率24.77%)累计解释94.81%的变异。PC1主要受全磷(TP)、Fe、Mn、胸径和株高的正向驱动,PC2则与全钾(TK)、Mg和Zn呈显著正相关。T1群落的玉蕊叶片在P、Fe、Mn、K、Mg和Zn含量及生长指标上均最优,综合得分最高(T1>T3>T2),印证了其土壤养分优势及低竞争压力;T2群落的高有机碳和全氮未能抵消高Na(盐度)的抑制作用,而T3群落虽钙、钾含量较高,但无瓣海桑的强竞争导致玉蕊生长受限。PCA进一步表明,P、Fe、Mn、K、Mg和Zn是促进玉蕊生长的核心因子,而有机碳、全氮和Na则因群落环境差异呈现不同的限制效应。【结论】不同群落中,玉蕊叶片与根际土壤矿质元素含量差异显著。土壤pH值、盐度、有效钾和钠含量是限制玉蕊生长的关键因素。T2和T3混生群落中,卤蕨和无瓣海桑的资源竞争抑制了玉蕊的生长。玉蕊生长差异受物种竞争及坡位条件共同影响,主成分分析揭示了群落间差异,为玉蕊的科学管理提供了依据。
【Objective】To investigate the variation in mineral element contents in leaves and rhizosphere soil of Barringtonia racemosa across different community types,and to analyze the correlation between mineral elements and soil factors,so as to provide a scientific basis for the management and conservation of B.racemosa growth in different habitats.【Method】Three community types along the Tiaofeng river in Guantian village,Suixi County,Zhanjiang City were selected:a pure B.racemosa community(T1),a mixed Acrostichum aureum-B.racemosa community(T2),and a mixed Sonneratia apetala-B.racemosa community(T3).Soil physicochemical properties,growth traits(tree height and diameter at breast height,DBH),and mineral element contents in leaves and rhizosphere soil were measured.Principal component analysis(PCA)was employed to explore the relationship between leaf and soil mineral elements and their variations among communities.【Result】1)Significant differences were observed in soil properties and mineral elements among the communities.Soil pH,salinity,and available potassium(AK)were significantly higher in T2 and T3 than in T1(P<0.05).Soil organic carbon,total nitrogen(TN),total potassium(TK),calcium(Ca),and iron(Fe)were significantly higher in T3 than in T1 and T2(P<0.05);2)Soil mineral elements significantly influenced the growth of B.racemosa.The pure community(T1)showed the highest leaf total phosphorus(TP),sodium(Na),iron(Fe),and manganese(Mn)contents,as well as significantly greater tree height and DBH,indicating that lower interspecific competition contributed to its superior growth;3)PCA revealed that PC1(69.04%variance explained)and PC2(24.77%)collectively accounted for 94.81%of the total variance.PC1 was positively driven by TP,Fe,Mn,DBH,and tree height,while PC2 showed significant positive correlations with TK,magnesium(Mg),and zinc(Zn).The T1 community scored highest in comprehensive evaluation(T1>T3>T2),reflecting its soil nutrient advantages and low competitive pressure.High organic carbon and TN in T2 did not mitigate the inhibitory effect of high Na(salinity),and although T3 had higher Ca and K contents,strong competition from S.apetala restricted B.racemosa growth.PCA further identified P,Fe,Mn,K,Mg,and Zn as key promoting factors,while organic carbon,TN,and Na exerted context-dependent limiting effects.【Conclusion】Significant differences in mineral element contents were detected in both leaves and rhizosphere soil of B.racemosa across different communities.Soil pH,salinity,available potassium,and sodium were key limiting factors.Resource competition from A.aureum and S.apetala in mixed communities(T2 and T3)suppressed B.racemosa growth.The growth variation was influenced by both species competition and topographic conditions.PCA effectively revealed inter-community differences,providing a scientific basis for the management of B.racemosa.
作者
梁芳
刘冰
檀小辉
於艳萍
李琳
林谕彤
何世有
梁裕宁
邓旭
LIANG Fang;LIU Bing;TAN Xiaohui;YU Yanping;LI Lin;LIN Yutong;HE Shiyou;LIANG Yuning;DENG Xu(Yulin Normal University,Yulin 537000,Guangxi,China;Guangxi Zhuang Autonomous Region State-Owned Liuwan Forestry Farm,Yulin 537000,Guangxi,China;Guangxi Subtropical Crops Research Institute,Guangxi Academy of Agricultural Sciences,Nanning 530001,Guangxi,China;Guangxi Fangchenggang City Fangcheng District Natural Resources Bureau,Fangchenggang 538021,Guangxi,China)
出处
《中南林业科技大学学报》
北大核心
2025年第11期10-18,65,共10页
Journal of Central South University of Forestry & Technology
基金
广西自然科学基金项目(2022GXNSFBA035540)
广西农业科学院基本科研业务专项(桂农科2024YP134)
广西高校中青年教师科研基础能力提升项目(2024KY0591)
玉林市科学研究与技术开发计划项目(玉市科202235105)。
关键词
玉蕊
土壤养分
矿质元素
生长响应
群落类型
Barringtonia racemosa
soil nutrients
mineral elements
growth response
community types
