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时间:2020-03-24
《冶炼厂周边农田土壤水稳性团聚体中镉的分布规律.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、2016,35(1):80-85农业环境科学学报2016年1月———————————————————————————_.Journalof伽·EnvironmentScience●——————————————————————————一郁红艳,阮文权,杨广龙.冶炼厂周边农田土壤水稳性团聚体中镉的分布规律叨.农业环境科学学报,2016,35(1):80--85.YUHong-yan,RUANWen-quan,YANGGuang-long.Distributionofcadmiuminsoilwater-stableaggre
2、gatesinfarmlandsurroundingasmeher[J].JourndofAgro-EnvironmentScience,2016,35(1):80-85.冶炼厂周边农田土壤水稳性团聚体中镉的分布规律郁红艳,院文权,杨广龙(江南大学环境与土木工程学院,江苏无锡214122)摘要:采集冶炼厂周边农田表层土壤样品,通过湿筛法获得不同尺寸水稳性团聚体,测定原土与团聚体层级不同化学形态镉(Cd)含量及理化性质,分析影响不同化学形态cd在团聚体层级分布的主要因素。结果发现:土壤总cd含量3.77mg·kg~,以惰性
3、的残渣态Cd为主,其次是潜在可利用结合态Cd;不同化学形态Cd在粉砂+粘粒组分中最易富集,而在微团聚体中不易积累;考虑团聚体质量分配,总Cd和各化学形态Cd主要存在库是2000—250斗m大团聚体和微团聚体;影响总Cd分布的主要因素是土壤有机碳,影响可交换态Cd和铁锰氧化物结合态Cd分布的主要因素是CEC。以上结果表明:Cd在粉砂+粘粒组分中富集以及存在于2000—250Ixm大团聚体中的潜在可利用结合态Cd导致农田土壤cd污染风险提高。显然,通过土壤物理组分分级和Cd的化学形态分级的途径有助于客观、全面地解析Cd的污染
4、风险。关键词:农田;团聚体;镉;分配;污染中图分类号:X53文献标志码:A文章编号:1672—2043(2016)0l一0080—06doi:10.11654/jae8.2016.01.011Distributionofcadmiuminsoilwater-stableaggregatesinfarmlandsurroundingasmelterYUHong-yan,RUANWen-quart,YANGGuang-long(SchoolofEnvironmentandCivilEngineering,JiangnanUn
5、iversity,JiangsuWuxi214122,China)Abstract:Soilsampleswerecollectedfromthesurfacelayeroffarmlandaroundasmelteranddividedintofourdifferentsizesofwater—sta—bleaggregatesbywet—sieving.Cadmium(Cd)fractionsandsoilphysicochemicalpropertiesofbulksoilandsoilaggregateswere
6、measured.CorrelationbetweenCdfractionsandphysicochemicalpropertieswerealsoanalyzed.ContentoftotalCdinbulksoilWasaveragely3.77mg‘奴一.ThemainCdfractionWasresidualfraction,fouowedbypotentiallyavailablefractions.AllCdfractionswereenrichedintllesiltandclayfractions,but
7、littleCdWasfoundinmicroaggregates.Consideringthemassweightofaggregates,totalCdandVSriOUSCdfractionsweremainlydistributedin2000-250斗mmacroaggregatesandmicroaggregates.ThemainfactoraffectingthedistributionoftotalCdWassoilor-garliccarbon,whereasthedistributionofexch
8、angeableCdandCdboundtoironandmanganeseoxideswasprimarilyaffectedbyCEC.TheseresultssuggestthattheexistenceofpotentiallyavailableCdfractionsinthe2000-250岬macroag
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