共查询到20条相似文献,搜索用时 31 毫秒
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IntroductionTheuseofchemicals,includingpesticides,hasbecomeanintegralandeconomicallyessentialpartofmodernagriculture.Pesticide?.. 相似文献
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IntroductionContaminationofediblevegetationbypersistent,ubiquitouschemicalssuchasPCBs,dioxins,pesticides,andherbicidesprovidesamajorexposureroutetohumans ,domesticanimalsandwildlife .Uptakeoftheseorganicchemicalsbyplant,andsubsequentdistributionintheplan… 相似文献
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Combined effects of two sulfonylurea herbicides on soil microbial biomass and N-mineralization 总被引:1,自引:0,他引:1
IntroductionAgrochemicalshavebeenactedaveryimportantroleinagriculturalproduction .Foravoidingdamageofcrops,manykindsofpesticidesareappliedforthereasonofinsect,diseasesandweedcontrolinChina .Scientistshavedonealotofworkonthefateandmetabolismofpesticides,… 相似文献
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IntroductionInrecentyears,moreandmoreevidencesshowthatgreenhousegasesemissionshavebeguntoinfluenceglobalclimate.Greenhouseeffectisoneofthemostrigorouschallengesnowadaysweface.Sincebothcauseandimpactofclimatechangeareglobal,thewholeworldshouldtakeacti… 相似文献
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Addition of anaerobic tanks to an oxidation ditch system to enhance removal of phosphorus from wastewater 总被引:1,自引:0,他引:1
IntroductionEutrophicationofwaterbodieshasbeenattendedmanyyearsbyscientistsandthepublic .Phosphorusinthewaterbodiesoriginatesfromtheatmosphere,agricultureanddomesticandindustrialwastewater;domesticandindustrialwastewaterbeingthelargestsource .Therefore ,… 相似文献
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Utility of semivariogram for spatial variation of soil nutrients and the robust analysis of semivariogram 总被引:1,自引:0,他引:1
IntroductionGeostatisticshasprovenusefulforcharacterizingandmappingthespatialvariationofsoilproperties (Webster,1985;Trangmar,1985;Goovaerts ,1999) .Mostpreviousgeostatisticalstudiesfocusedonthedataofarelativelysmallspatialscale(Chien ,1997) .Theapplicationofgeostat… 相似文献
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Soil water characteristics in mountain poplar stand and its benefits to soil and water conservation in loess hilly region 总被引:2,自引:0,他引:2
SoilwatercharacteristicsinmountainpoplarstandanditsbenefitstosoilandwaterconservationinloesshillyregionWuQinxiao;LiuXiangdong... 相似文献
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IntroductionBothmethomylandthiodicarbareNmethylcarbmatepesticides.Methomyliseffectiveonawiderangeofinsectsasanovicide,larvicid... 相似文献
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CharacteristicsforthehybridcelFoazobtainedfromtheprotoplastfusionbetwenyeastandphotosyntheticbacteriainsoybeanprocesingwastew... 相似文献
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GeochemicalcharacteristicsofrareearthelementsinWuhansectionoftheYangtzeRiverWangLijun;ZhangShen;ZhangChaosheng(InstituteofGeo... 相似文献
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CharacteristicsofphosphoruschemistryanditsgeographicaldistributionintheHaiheRivervalley,NorthChinaJiangGaoming;HuangYinxiao;L... 相似文献
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1IntroductionSincefirstpaperpublishedin1958,computersimulationtechniqueforroomacousticshasdevelopedalot.Itplaysaveryimportant... 相似文献
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Core concepts of landscape ecology 总被引:2,自引:0,他引:2
1IntroductionLandscapeecologyisanewlyemergedtransdisiplinarysubject.Thismultidisciplinecharacteristicbringsbenefitstoitsdeve... 相似文献
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Harvey A. Shapiro 《环境科学学报(英文版)》1999,11(2):167-173
1IntroductionMcHargssuitabilityevaluationapproachtoalanduseplanningknownas“ecologicalplanning”haspracticedinsomecountriesofE... 相似文献
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IntroductionTheozoneholehasbecomeaseasonalphenomenoninsouthpolarsincethediscoveryofAntarcticozoneholein1985(Farman,1985).Theozoneho... 相似文献
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Sun Kee Hong 《环境科学学报(英文版)》1999,11(2):181-187
Throughthestatisticsandtheanalysisoflandscapemap,changesoflandsuseregimeandlandscapestructureduring20yearswereinvestigatedin... 相似文献
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Fromeconomicprosperitytoecologicalsustainability──AtheoreticalandpracticalconcernofsustainabledevelopmentinChinaWangRusong,Hu... 相似文献
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CharacteristicsofchangeofhumicsubstanceinsoilindegradedgraslandsShengXuebinResearchCenterforEcoEnvironmentalSciences,Chinese... 相似文献