賀蘭山6個典型植被帶土壤微生物化學(xué)計量特征及其影響因素分析

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中圖分類號：Q938 文獻(xiàn)標(biāo)志碼：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）

賀蘭山地跨溫帶草原與荒漠兩大植被區(qū)域交接處，位于中國 200mm 等降水量線上，是我國地理、氣候的重要分界線，也是騰格里、烏蘭布和沙漠與毛烏素沙地的分界線，保存著我國西北干旱區(qū)較為罕見的森林生態(tài)系統(tǒng)[1-3]。（剩余11753字）