海拔变化条件下针阔混交林根际土壤活性有机碳特征及影响因素

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中图分类号：S714 文献标志码：A文章编号：1000-2006（2026）01-0133-09

Abstract：【Objective】Thisresearchaimstoinvestigatethediferences inverticaldistributionofrhizospheresoilorganic carbon contentinfirconiferous-broadleavedmixed forestsatdiffrentaltitudesin Baishanzu National NatureReserve， Zhejiang Province，and toclarifythefactorsinfluencing theactivecomponentsoforganiccarbonunderaltitudinal changes.【Method】Thestudywascariedoutinfirconiferous-broadleaved mixed forestsatdiferent altitudegradients （600，800，1000 and 1 200m ）in the park，and three sample plots were set up in each altitude gradient.Soil properties[total organiccarbon（TOC），total nitrogen（TN），totalphosphorus（TP）andsoil pH]，soil enzyme activity and soil organic carbon content in soil layers of 0-20 cm were measured and analyzed in each sample plot. Analyzedthedistributioncharacteristicsofrhizospheresoilorganiccarbonalong thealtitudeandthe influencing factors， andcalculated the soilcarbon polmanagementindex（CMI）.【Result】TOC，TNandTPcontentsof therhizosphere soil increased graduallywith the riseof altitude，and the particulate organiccarbon （POC）and TOC varied in the same way；thecontentofreadilyoxidizableorganiccarbon（ROC）and mineral-bound organiccarbon（MOC）firstly increased and then decreased.The β -glucosidase activity of rhizosphere soil tended to increase with elevation.The soil carbon pool management index（CMI）of the other threeelevation gradients significantly increased.The TOC，POC and ROC contents of rhizosphere soil were significantly positively correlated with TN， β -glucosidase and polyphenol oxidase were significantlypositivelycorelatedwithTOC.Theinteractionefectsofrhizosphereandelevationhadnosignificantffect onsoil organic carbon fractions and enzyme activities.Redundancy analysis showed thatTN was the main factoraffecting activeorganic carbon fractionsand CMI.【Conclusion】Climateandsoil physicochemical changesbrought about by altitudechangesareimportantfactorsaffectingthealtitudinaldiffrencesinrhizospheresoilorganiccarbon，andsoil nitrogencontentisthedominantfactorafectingactiveorganiccarbonintherhizospheresoil.Thequalityofsoilcarbon pool inhigh-altitudeareas is high，andthe protectionof vegetation in high-altitudeareas should bestrengthened.

Keywords：altitudegradient；carbon component；enzymaticactivity；coniferous-broadleaved mixed forests; rhizosphere soil

土壤有机碳库是陆地生态系统中最活跃的碳库，在土壤碳循环中起着十分重要的作用[1]，其微小变化可显著影响全球气候变化[2-3]。（剩余15509字）