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英语翻译谁能帮我翻译下!奖励可以增加SamplingsitesweresituatedalongagradientofpollutiongoingfromthesmeltertotheNorth-East.AllsiteswerecoveredbyScotchpine(PinussilvestrisL.).Sampleswerecollectedfromthreeloca
更新时间: 2025-08-22 22:18:38
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英语翻译

谁能帮我翻译下!奖励可以增加

SamplingsitesweresituatedalongagradientofpollutiongoingfromthesmeltertotheNorth-East.AllsiteswerecoveredbyScotchpine(PinussilvestrisL.).Sampleswerecollectedfromthreelocationsthatweresituatedatintervalsofapprox.1,2and6kmfromthesmelter(furtherreferredtoassoilsA,B,andC).Thelocationshaveasimilarsoilstructure:sandywithapproximately2.5%ofclay(Koopmansetal.,1993).Samplesweretakenfromtheupper10cmofthesoilminerallayer(litterwasremoved).Oneitherlocationfourreplicateplotsweresampled.Fromeachreplicate15soilcores,4cmindiameterand10cmdepthweretakenandthenmixedandsieved(0.5cmmesh).

Preparationofsamples

Aftersieving,fieldmoistsoilfromeachplotwasdividedintosubsamplesofapprox.250gandeachofthemwasplacedina300mlplasticjar.Thesamplesweredividedintofoursets,eachcontainingfoursamples.Onesetwastreatedwithleadnitrate(1000mgPbkg)1dw),thesecondwastreatedwithsodiumchloride(6.67gNaClkg)1dw),thethirdwasheatedfor18hat50Candthefourthoneservedasanon-stressedcontrol.Aftertreatmentsampleswerekeptindarknessatatemperatureof20Cuntilmeasurement.Fromeachjarsamplesforrespiration,bacterialgrowthratemeasurementandchemicalanalysesweretaken.

Respiration

Twentyfourhoursbeforeeachmeasurement200gofsoilfromeachjarwasplacedinto±600mlglassbottlesanddrylucernemeal(alfalfa(Medicagosativa))wasaddedandmixedthoroughly.Lucernewasaddedinamountscorrespondingto3.2gCkg)1soil,whichwassufficienttoinducerespirationandoffsetnutrientlimitation.Withoutsubstrateadditiontherespirationisusuallytoolowtomeasuresignificantdifferenceswithin24h.CarbondioxideproductionwasmeasuredwithaGCapparatus(CarloERBAInstruments).Forthefirstmeasurementsampleswerepreparedasdescribedabovedirectlyafterapplicationofstressandterminationofdisturbance.

Measurementwasperformedasfollows:5gofsoilwasshakenwith40mlofmilliQ-waterinplastictubes,thencentrifugedandfilteredthroughglasswool.Supernatants(1.5ml)weredecantedintoeppendorftubes.Sampleswereincubatedfor2hat20Cwith3.75llradio

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  采样站点位于了沿污染梯度去从精炼工对北部East.All站点由刻痕杉木(PinussilvestrisL.)盖了.样品从位于在间隔时间大约的三个地点被收集了.1,2和6公里从精炼工(进一步指土壤A、B,和C).地点有一个相似的土壤结...
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