甘肃兴隆山退耕还林过程中土壤碳氮磷钾养分含量及化学计量特征

打开文本图片集

中图分类号：S791.229 文献标志码：A 文章编号：1673-923X（2025）09-0106-15

Abstract：【Objective】Tisstudymedtovestigatethehangesinsoilcabo（C），itrogen（N），posphorus （P）ndasi （K） nutrient contents and their C：N：P stoichiometric characteristics during the growth of Larix principis-rupprechtii plantations intheXiglongmountainretuingfarmlandtoforestarea.Tegoalistocarifyteinteractionsandconstraintsamongsoilutrient elementsduringthtransitionfromfarmlandtoforestandprovideascientifcbasisfothesustaablemanagementofartifcalforests inthisreforesationgio【eto】esdyocusedon8，nd27geL.prinipis-upprechiptatios，ihla （cropland） and grassland （abandoned cropland） as controls.Soil samples from 0⋅100cm depthwereanalyzed forpH，organic carbon （SOC），totallsots）ebe availableposphorus（AP）.ThedistributiopatesofsoilnutrietsandSOC：T：TPstoiciomericatis wereexamindtoeplor theirchangesandinterrelationsipsuringthrasitionfromcroplandtoforest.【Result】1）WithcreasingsoildepthOC，， HN，SOC：， ∵ TP，and TN：TPin10，18，and27age L.principis-rupprechtiiplantations showedadecreasing trend.APand AKdecreasedcosallfivevegetationtyps，ileTKandpHexbitedobviouschangepate;2）Withireainga ofreturningfarmlandtoforestland，SOC，TN，andHNinthe 0-20cm soillayerinitiallydecreasedandthenincreased，and showeda clearaccumulation effect.The SOC：TP and TN：TP ratiosin the 0-60cm layerinitiallydecreasedand thenincreased，whileagradual decline was observed in the 60⋅100cm layer.TP， TK and SOC ：TN showed no obvious change pattern in the process of vegetation evolution.However，after returning farmlandto forest for27years，the mean valuesofSOC，TNandHNof 0⋅100cm soil were muchlowertantatoffmland;3）SOC，T，andHweresignifatlyposiivelycoelatedwithSOC：Tn：Tdthe strengthofthiselaicreaedilethHoerOCndHodakelationihteOtio 【Conclusion】Forestageanddensityarethemainfactorsthatafecttheefectofvegetationonsoilchemicalimprovement.The improvement of soil chemical properties by vegetation isa slowand long-term processIn the managementof L principis-rupprechtii plantations，itisecommededtoaduallducestaddsitydpromoteaturalegenationteasteproportiofodlaf species.Tsilleteitololidell in the ecosystem.

Keywords：sobdactesto;ih forest;Xinglong mountain

土壤是陆地生态系统的重要组成部分1]，是植物生长的载体及所需营养元素的主要来源，因此对地上植物的生长发育具有重要的调控和驱动作用[2]。（剩余26292字）