广西林业科学2025，Vol.54Issue(4)：384-393,10.DOI:10.19692/j.issn.1006-1126.20250404
不同桉树混交林土壤养分与碳库稳定性
Soil Nutrients and Carbon Pool Stability of Different Eucalypt Mixed Plantations
摘要
Abstract
In order to investigate effects of different mixing ratios between eucalypt and native tree species on soil nutrients and carbon pool stability,taking eucalypt pure plantation(EM)and eucalypt-native tree species mixed plantations[2∶3(MF1),1∶3(MF2)]as study objects,soil physical and chemical properties were mea-sured,carbon storage and related indexes of soil carbon pool were calculated,and relationships among soil physical and chemical properties and carbon pool stability were analyzed.Results showed that mixing signifi-cantly enhanced soil nutrient content and significantly decreased C∶P and N∶P.In 0-40 cm soil layer,com-pared with EM stand,C∶P of MF1 and MF2 stands decreased by 35.7%and 26.3%respectively,while N∶P de-creased by 32.1%and 27.7%respectively.Mixing increased soil readily oxidized carbon(ROC)content,soil readily oxidized carbon and soil organic carbon ratio(ROC∶SOC),SOC storage(SOCs),and ROC storage(ROCs).In 0-40 cm soil layer,these indexes of MF1 and MF2 stands increased by 138.7%-198.7%,50.7%-113.8%,42.4%-50.9%and 133.5%-212.7%respectively compared with EM stand.MF2 stand showed the highest SOCs(120.79 t/hm²).Mixing significantly elevated carbon pool activity(CPA),carbon pool activity in-dex(CAI),carbon pool index(CPI)and carbon pool management index(CPMI).MF2 stand achieved the highest CPI,and other indexes peaked in MF1 stand.Correlation analysis result revealed that there were interaction ef-fects among soil total nitrogen(TN)content,total phosphorus(TP)content,ROC content,C∶P,N∶P and CPMI.Redundancy analysis result revealed that TN content and C∶N were key factors influencing soil carbon pool sta-bility.Eucalypt mixing with native tree species significantly enhanced soil nutrient content and carbon pool sta-bility,with MF2 stand performing better in maintaining carbon pool stability.关键词
土壤碳库/土壤养分/土壤碳库管理指数/桉树人工林Key words
soil carbon pool/soil nutrient/soil carbon pool management index/eucalypt plantation分类
农业科技引用本文复制引用
李梦婷,杨明武,梁承华,王勇,程翔,农美玲,王仁杰,田小东,张志娟,陈风帆..不同桉树混交林土壤养分与碳库稳定性[J].广西林业科学,2025,54(4):384-393,10.基金项目
广西优良用材林资源培育重点实验室自主课题(2024-A-03-02) （2024-A-03-02）
广西林科院研究团队项目(2024RT07) （2024RT07）
广西自筹经费林业科技项目(桂林科研[2022ZC]第18号) （桂林科研[2022ZC]第18号）
