摘要
Soilfoodwebstructureisfundamentaltoecosystemprocessandfunction;moststudiesonsoilfoodwebstructurehavefocusedonagro-ecosystemsunderdifferentmanagementpracticesandnaturalterrestrialecosystems,butseldomongreenhouses.ThisstudyexploredthestaticandtemporalvariabilityofsoilfoodstructureintwogreenhousesofShandongProvince,NorthChinaoveratwo-yearperiod.Thestaticpropertiesweremeasureddirectlybysurveyingfunctionalgroupcompositionandaseriesofparametersportrayingthespeciesproperties,linkproperties,chainpropertiesandomnivorypropertiesoftheweb,aswellasindirectlythroughcalculationofnematodeindices,enrichmentindex(EI),structureindex(SI),andchannelindex(CI).Thedynamicvariabilityofgreenhousesoilfoodstructurewasdescribedbythedynamicsoffunctionalgroups,Bray-Curtis(BC)similarityandclusteranalysis.Theresultsshowedthatthegreenhousesoilfoodwebcontained14functionalgroups,withmicrobeshavingthehighestmeanbiomass,followedbyprotozoa.Ofthethreefunctionalgroupsofprotozoa,flagellateswerethedominantgrouponmostsamplingdates,amoebaeonlybecamethedominantgroupduringthesummer,whileciliatesweretheleastprevalentgroup.Allnematodeswereassignedintooneofthefourfunctionalgroups,bacterivorous,fungivorous,herbivorousandomnivorous,andthefungivorousnematodeshadthelowestmeanbiomass.Miteswereassignedintothreefunctionalgroupsandtheomnivorousnoncryptostigmaticmiteswerethedominantgroup.Allthefunctionalgroupsshowedsignificantseasonalchanges.Thesoilfoodwebconnectancewas0.15,themaximumfoodchainlengthwas5,andtheaveragefoodchainlengthwas3.6.TheprofilesoftheEIandSIshowedthatthefoodwebwasresourcedepletedwithminimalstructure.TheresultsofCIindicatedthatthebacterialdecompositionpathwaywasthedominantpathwayinthefoodwebofthegreenhousesoilsstudiedandtheresultsofBCsimilarityshowedthatthesoilfoodwebhadhig
出版日期
2014年02月12日（中国期刊网平台首次上网日期，不代表论文的发表时间）
