欢迎来到天天文库
浏览记录
ID:55640447
大小:374.47 KB
页数:6页
时间:2020-05-22
《黄河三角洲新生湿地磷分布特征及吸附解吸规律-论文.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、f第43卷第4期Vo1.43,No.4,346—3512014年7月GEoCHIMICAJuly,2014黄河三角洲新生湿地磷分布特征及吸附解吸规律孙军娜一,徐刚,邵宏波(1.中国科学院烟台海岸带研究所,山东烟台264003;2.中国科学院大学,北京100049)摘要:采用改进的Hedley磷分级方法研究了黄河三角洲新生湿地由河向海过渡带表层土壤磷形态变化和分布特征,并通过等温吸附解吸实验阐明了沿程土壤对外源磷的持留能力和释放风险。结果表明,各样点无机磷占总磷93%以上,是磷的主要存在形态。土壤中有机磷含量较低,可能与较低的有机质含量有关。无机磷中稀盐酸
2、磷是最主要存在形态,与各样点Ca/A1含量密切相关。有效磷含量在18.6~33.4mg/kg之间,仅占总磷的3.2%~5.9%,可能会限制湿地植物的生长。覆有植被的土壤中有效磷含量显著高于河滩和海滩土壤,说明植被存在对有效磷的积累有一定促进作用。由吸附解吸实验可知,加人较低浓度(0.05~5mg/L)的外源磷时,随着初始磷浓度的升高,土壤对磷的吸附量增加,吸附率为70%~99%,解吸率小于7%,这说明各样点土壤的除磷能力较强,且流失风险较低。关键词:磷;Hedley分级;吸附;解吸;黄河三角洲中图分类号:P595;X142文献标识码:A文章编号:0379
3、.1726(2014)04.0346—06Fractionationandadsorption-desorptioncharacteristicsofphosphorusinnewlyformedwetlandsoilsofYellowRiverDelta,ChinaSUNJun.na,2XUGangandSHAOHong.bo。1.YantaiInstituteofCoastalZoneResearch,ChineseAcademyofSciences,Yantai264003,China;2.UniversityofChineseAcademyofS
4、ciences,Beijing100049,ChinaAbstract:AmodifiedHedleyphosphorus(P)fractionationwasusedtostudythePdistributionseawardinthenewlyformedwetlandssoilsofYellowRiverDelta.Inaddition,theadsorption—desorptionexperimentswereperformedtoevaluatetheabilityofPretentionandreleaseinthesampledsoils
5、.TheresultsshowedthatinorganicPremainedthelargestportionoftotalP(TP),accountingformorethan93%ofTPDuetothelowercontentoforganicmatter,theorganicPwasrelativelylowinthesesoils.AmongtheinorganicP.DiluteHC1.Pwasthedominatedform,relatedwiththecontentofCainsoils.ThecontentofavailablePwa
6、s18.6~33.4mg/kg.accountingforonly3.2%-5.9%0fTPinsoils,whichmightrestrictthegrowthofplantsinthewetlandsystem.Furthermore.itwasfoundthatthecontentofavailablePinthesamplingsitecoveredwithplantswashigherthanthatinthebeachsoils,indicatingthatthevegetationcovermayenhancetheaccumulation
7、ofsoilavailableP.Accordingtotheadsorption-desorptionexperiments,whentheconcentrationofinitialPadditionwasintherangeof0.05-5mg/L,thePadsorptionincreasedwiththeincreaseofinitia1Pconcentration.Moreover,thepercentageofadsorptionwas70%-99%whiledesorptionratewaslessthan7%.Itcouldbeconc
8、ludedthatinthesesoils.thecapacityofPrete
此文档下载收益归作者所有