偃松重度火烧迹地土壤元素化学计量特征及其空间分布格局的短期变化

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中图分类号：S762；S714.5 文献标志码：A

Abstract：【Objective】ToclarifytheresponseandinteractionofsoilelementcontentandfunctionatdiferentdepthsunderPinus pumilaforestoseverelhtingfrterfereeandtoprovidedataeferenceandteoreticalbasisforteestorationofinspumila ecosystemafterseverelightningfireinterference.【Method】Thestudyfocusedonthesoilleachinganddepositionlayers inthe severelylightingamagedareaofinuspumilainthGeaterKinganangeThearbonrogenosphorusandtactiet contentofthesoilweremeasuredintheyearandyearafterthefireandthestoichiometricratiowascalculated.One-wayANOVA， SpearmancoelatinandManteltestwereusedtocaulatediferencesndcorelaions;Randmforestimporanceaningissed toexplaithecontributionofsilelements tostoichometry;Thepartialleastsuaresstructuralquationmodelissedtodeostrate thecompresiectelatioseensltialaeovryilmntsdliotryoreder firedisturbance.【Result】Thecontentandstoiciometryofarbonrogen，posphrus，copper，andmercuryinthesilleacing layerandsedimentupperlayershowedsignificantresponsestofireinterferenceandfireexposuretime.Fireinterferenceincreasedthe variabilityofracenutrientsintheleachinglayerandtechangesinsoilelementcontentshowedalagwithsoildepth.Thecotentof tracenutrientstleadiboood signifcantlyexplainandpredictsoilstoichiometricratios.【Conclusion】Fireinterferenceinibitsthemineralizationrateoforganic materinleachedsoilandincreases teavailabilityofphosphorusinsoilsedimentsbyhightemperatureburingandchangigthesource ofsubstances.Thesoilelementcontentundergoessignificantchangesintheshortermafterfireduetoleachingandlagsasthesoil layerdepens.Severefiredisturbanceweakenedthedirecteffctofsoilspatialpateosoilelementsehancedtheiectfctof recoverytimeonsoillementcontent，andsultedingnifcantfectsofsoilsatialpatendecoverytimeonsoilstoiometry

Keywords：Pinuspumila;severe fire;lightningfire;C：N：Pstoichiometry;tracenutrients;soilspatialpattern

森林火灾是当今全球森林生态系统的主要影响因子，全球变暖导致的极端高温和干旱，使火灾的发生频率和严重程度持续增加，对全球生态安全产生日益严重的威胁[1]。（剩余18282字）