林业科学2025，Vol.61Issue(6)：75-84,10.DOI:10.11707/j.1001-7488.LYKX20240089
马尾松人工林土壤有机碳及其组分对林龄的响应及驱动因素
Response and Driving Factors of Soil Organic Carbon and Its Fractions to Stand Age in Pinus massoniana Plantation
摘要
Abstract
[Objective]Analyzing the variation characteristics and influencing factors of soil organic carbon(SOC)and its fraction carbon pools in Pinus massoniana plantations of different stand ages,to provide a reference for clarifying the SOC sequestration mechanisms in plantations.[Method]This study investigated subtropical P.massoniana plantations across stand age classes:young(6 a),middle-aged(13 a),near-mature(29 a),mature(38 a),and over-mature(57 a).Explored age-dependent patterns of SOC and its fractions in the 0-10 cm soil layer,analyzed relationships between SOC fraction dynamics and key indicators(tree characteristics,soil chemical properties,and microbial biomass),and further discussed the underlying mechanisms of SOC sequestration in plantation ecosystems.[Result]The SOC content in mature plantation was significantly higher than that in young plantation and middle-aged plantation.The dry mass fraction of mineral-associated fraction(72.98%)in mature plantation was significantly lower than young plantation,middle-aged plantation,near-mature plantation and over-mature plantation(92.67%-93.33%),while the dry mass fraction of light particle fraction(26.08%)and heavy particle fraction(0.93%)were significantly higher than young and middle-aged plantations.The organic carbon content of mineral-associated fraction in mature plantation was significantly higher than young,middle-aged,near-mature,and over-mature plantations,the organic carbon content of heavy particulate fraction was significantly lower than that in over-mature plantation,and the organic carbon content of light particulate fraction was significantly lower than middle-aged plantation.The organic carbon mass fraction of mineral-associated fraction in all age groups was>50%,which dominated the accumulation of SOC.The organic carbon dry mass fraction of mineral-associated fraction in mature plantation(66.78%)was significantly lower than young,middle-aged,near-mature and over-mature plantations.Correlation analysis revealed that SOC content was significantly positively correlated with the dry mass fraction of light particle fraction,the dry mass fraction of heavy particle fraction and the mineral-associated fraction organic carbon content,and was significantly negatively correlated with the light particle fraction organic carbon content.Stepwise regression analysis showed that SOC accumulation was driven by forest floor litter,dry mass fraction of light particle fraction,dry mass fraction of heavy particle fraction and mineral-associated fraction organic carbon content(R2=0.98).The partial least squares model showed that the total effect of mineral-associated fraction(including organic carbon content and carbon-phosphorus ratio of mineral-associated fraction)on SOC accumulation was the highest(0.91)during stand development.[Conclusion]The mineral-associated protection mechanisms mediate the dynamics of soil organic carbon sequestration during stand development in P.massoniana plantations.In the mature plantation,synergistic effects between forest floor litter and SOC fractions facilitated highly efficient SOC sequestration.关键词
马尾松人工林/土壤有机碳/土壤有机碳组分/林龄Key words
Pinus massoniana plantation/soil organic carbon/soil organic carbon fraction/stand age分类
农业科技引用本文复制引用
胡建文,刘常富,勾蒙蒙,雷蕾,陈会玲,张佳佳,朱粟锋,斛如媛,肖文发..马尾松人工林土壤有机碳及其组分对林龄的响应及驱动因素[J].林业科学,2025,61(6):75-84,10.基金项目
中央级公益性科研院所基本科研业务费专项资金(CAFYBB2022XD002) （CAFYBB2022XD002）
国家自然科学基金重大项目课题(32192434). （32192434）
