简介：Adsorptionanddesorptionofexogenousrareearthelements(REE)insoilswerestudied.ResultsshowedthatsoilshadstrongadsorbabilityforREEandtherateofadsorptionofREEwasover95%oftheaddedREEinthesetests.ThecharacteristicsofadsorptionisothermscorrespondedwellwiththebothFreundlichandTemkinequations,butdeviatedfromtheLangmuirequation.TheadsorptionofREEtendedtoincreasewiththerisingofsoilpH.AsequentialextractionmethodusedforstudingthedesorptionanddistributionofREEsorbedinsoilsarealsodiscussed.

简介：Thedistributionofrareearthelement(REE)formsinsoilsisgiveninthepresentpaperonthebasisofsequentialfractionationanddeterminationof34representativesurfacesoilscollectedfromallpartsofChina.ResultsobtainedshowthattheextractionrateofwatersolubleandexchangeableREEhadtheodd-evenphenomenonandthatoforganicallyboundREEfromLatoLutendedtoreducegraduallywiththeincreaseofatomicnumber.ThestabilityofScandtheactivityandenrichmentofTminsoilsareproposed.Furthermore,thepapermakesapreliminarydiscussiononthedifferencesintheconcentrationdistributionofvariousformsofindividualREEinsomesoils.

简介：利用GoogleEarth的存贮文件（KML）将Shape格式的林业基本图转入到GoogleEarth中读取,并实现了小班属性数据的显示,为GoogleEarth的林业应用提供一个可行的方法。

简介：以GoogleEarth为基础,通过数据转换结合ArcGis等软件,可实现公益林小班、“山林现状图”直观的计算机操作,为公益林信息化管理提供了一种新的工作方法.

简介：Afieldtestwiththetraditionalrotationofpaddyrice/uplandcrop(wheat)wascarriedoutonapaddysoilderivedfromredearthtoelucidatetheeffectoforganicmanureonthephoshporusadsorption-desorptionbysoilanditsPavailability.Soilsamplesweretakenfromdifferenttreatmentsatricehavestingstageandanalysed.TheisothermaladsorptionofPbythesamplesfittedverywellwithLangmuirequation,andhence,theparametersintheequation,i.e.,maximumadsorption(qm),constantrelatedtobondingenergy(k)andtheirproduct(k×qm)couldbeusedasacomprehensiveindextocharacterizethepotentialPadsorptivityofthesoil.Organo-inorganicfertilizationandorganicmanuringcoulddecreaseqmandk,whilemineralPapplicationhadlittleeffectonthem.TheisothermaldesorptionofPwassignificantlycorrelatedwithinitiallyaddedandisothermallyadsorbedP.PartofPaddedwasfixed,whichrepresentedthePfixationcapactyofsoil,andorganicmanuringcouldobviouslylowerthePfixation,ThecontentofsoilavailablePhadasignificantnegativecorrelationwithqm,kandfixedP.ItisconcluedthatorganicmanurecouldincreasethePavailabilityofpaddysoilderviedfromredearthbydecreasingqm.k,maximumbufferingcapacity(MBC=k×qm)andfixationcapacity.