贺兰山6个典型植被带土壤微生物化学计量特征及其影响因素分析

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中图分类号：Q938 文献标志码：A DOI：10.3969/j.issn.1007-7146.2025.03.007

Abstract： Soil microorganisms playacrucial role in nutrient cycling across diferent vegetation ecosystems，with varying vegetation types leading todistinct microbialcommunities.Microbialbiomass carbon （MBC），microbial biomassnitrogen （MBN），ndmicroialomassposporus（B）otet，aswellasteiratios，sgncantlyifueceecosstetrit cycling，lantgothdsoilaltosdiialgeaiotys （sepedsetaaeed grassland，evergreenoferousfoest，ndevergreenneedleleafsrubland）atderentelevationsinteHelanotains of Ningxia.MBC，MBN，MBP，soiltotalnitrogen （STN），soilorganic mater（SOM），soilpH，andsoil watercontent （SWC） were measured，andone-wayANOVA，edundancyanalysis （RDA），andvariancepartitioninganalysis （VPA），wereemploed toexplorethedistributionpatesofBC，MBNndBeologicalstoichiometryacrosserentelevationaletatio Zones and theirrelationships with soil physicochemicalfactors.Theresultsshowed：1）Thecontents ofMBC，MBN，and MBPvaried significantlywithaltitude ΔP<0.05 ）.MBCandMBN initiallyincreased，thendecreased，and subsequently rose againwith increasingaltitude，whereasMBP increased significantly above 1822m .All three reached theirhighest levels in evergreenneedleleaf shrubland，with valuesof 796.O2，47.26，and 24.07mg/kg ，respectively.2） TheMBC：MBN showed no significant diference withaltitude，MBC：MBPandMBN：MBPshowedafluctuatingtrendwithelevation，andalltreesowed adecreasing trendinthehighelevationvegetation zone.Thelowestvalues wereobservedinevergreenneedleleafshrubland. 3）RDAandVPArevealedthatSThadasignificantefectontheecologicalstoichiometriccharacteristicsofMBC，MBN，and MBP .In conclusion，the C，N，andPecological stoichiometric characteristics Varied significantlyacrossdifferent vegetation zonesinthe HelanMountainsand were primarily influenced by STN.

Keywords：HelanMountain;vegetationbelt;soilmicrorganisms;ecologicalstoichiometry;soilphysicochemicalactors （ActaLaser Biology Sinica，2025，34（3）：246-253）

贺兰山地跨温带草原与荒漠两大植被区域交接处，位于中国 200mm 等降水量线上，是我国地理、气候的重要分界线，也是腾格里、乌兰布和沙漠与毛乌素沙地的分界线，保存着我国西北干旱区较为罕见的森林生态系统[1-3]。（剩余11753字）