简介:Thedistributionofrareearthelement(REE)formsinsoilsisgiveninthepresentpaperonthebasisofsequentialfractionationanddeterminationof34representativesurfacesoilscollectedfromallpartsofChina.ResultsobtainedshowthattheextractionrateofwatersolubleandexchangeableREEhadtheodd-evenphenomenonandthatoforganicallyboundREEfromLatoLutendedtoreducegraduallywiththeincreaseofatomicnumber.ThestabilityofScandtheactivityandenrichmentofTminsoilsareproposed.Furthermore,thepapermakesapreliminarydiscussiononthedifferencesintheconcentrationdistributionofvariousformsofindividualREEinsomesoils.
简介:Adsorptionanddesorptionofexogenousrareearthelements(REE)insoilswerestudied.ResultsshowedthatsoilshadstrongadsorbabilityforREEandtherateofadsorptionofREEwasover95%oftheaddedREEinthesetests.ThecharacteristicsofadsorptionisothermscorrespondedwellwiththebothFreundlichandTemkinequations,butdeviatedfromtheLangmuirequation.TheadsorptionofREEtendedtoincreasewiththerisingofsoilpH.AsequentialextractionmethodusedforstudingthedesorptionanddistributionofREEsorbedinsoilsarealsodiscussed.
简介:研究长江三峡库区泥沙来源,并以此为依据开展水土保持工作,对于保障长江三峡水利枢纽工程安全运行和效益发挥,具有重要意义.在长江三峡花岗岩地区选定的典型小流域内,采用土壤剖面法及土壤侵蚀调查、坡面径流小区等方法,分析不同土地利用现状下的土壤物理特性及其与土壤侵蚀的关系,不同土地利用坡面及沟道的土壤侵蚀量.结果表明:研究区域不同土地利用状况土体内,土壤颗粒特性与土壤流失程度密切相关.随着土壤流失程度的增大,流域不同土地利用状况下的A层土壤颗粒粒径分选系数降低.不同土地利用状况下,土壤颗粒粒径组的对称性均较低;长江三峡花岗岩区的泥沙,主要来源于坡面土壤侵蚀;坡面侵蚀的泥沙主要来源于坡耕地,25°以上陡坡耕地侵蚀的泥沙量,约占坡面产沙总量的50%.