Comparison of Soil Biota Between Organic and Conventional Agroecosystems in Oregon, USA-中国Betway体育网页登陆

摘要 Soilsamplesat0-10cmindepthwerecollectedperiodicallyatpairedfieldsinCorvallis,Oregon,USAtocomparedifferencesinsoilmicrobialandfaunalpopulationsbetweenorganicandconventionalagroecosystems.Resultsshowedthattheorganicsoilecosystemhadasignificantlyhigher(P＜0.05)averagenumberorbiomassofsoilbacteria;densitiesofflagellates,amoebaeofprotozoa;somenematodes,suchasmicrobivorousandpredaceousnematodesandplant-parasiticnematodes;aswellasCollembola.GreaternumbersofRhabditida(suchasRhabditisspp.),werepresentintheorganicsoilecosystemwhilePanagrolaimusspp.werepredominantintheconventionalsoilecosystem.TheomnivoresandpredatorsofAcarinaintheMesostigmata(suchasDigamasellidaeandLaelapid),andProstigmata(suchasAlicorhaiidaeandRhagidiidae),werealsomoreabundantintheorganicsoilecosystem.However,fungivorousProstigmata(suchasTerpnacaridaeandNanorchestidae)andAstigmata(suchasAcarida)weresignificantlyhigher(P＜0.05)intheconventionalsoilecosystem,whichsupportedthefindingthattotalfungalbiomasswasgreaterintheconventionalsoilecosystem.Seansonalvariationsofthepopulationdependedmostlyonsoilmoistureconditionandfoodwebrelationship.ThepopulationdeclinedfromMaytoOctoberforbothagroecosystems.However,higherdiversitiesanddensitiesofsoilbiotasurvivedoccurredintheorganicsoilecosysteminthedryseason.

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Comparison of Soil Biota Between Organic and Conventional Agroecosystems in Oregon, USA

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