简介：Thepapersummarizedthemeaningofpost-evaluationforcomprehensivebenefitsofforestryecologicalprograms,discussedandrevieweditsdevelopmentprocessintermsofcontent,indicatorsandmethodologies,andfinallypresenteditsdevelopmenttrendfromtheperspectivesoftheoreticalresearch,methodologicalresearchandapplicationresearch.

简介：Background:Theeffectofforestfireonsoiliscomplexandrelativelylessunderstoodthanitsabovegroundeffect.Understandingtheeffectoffireonforestsoilscanallowimprovingmanagementofvaluableforestecosystemsasadequateandproperinformationisveryimportantforefficientmanagement.Wehavestudiedtherecoveryofsoilpropertiesafterfire,usingachronosequenceapproach(two,fiveandfifteenyearsafterfireandcontrol).Soilsampleswerecollectedfromeachplotoffourfirepatches(B0,B2,B5&B15)fromthreedifferentdepthsviz.0–10(Top),10–20(Middle),and20–30cm(Bottom).Results:Soilorganiccarbonwaslowerthanunburnedplotsafterthefireandcouldnotrecovertothelevelofunburnedplot(B0)evenin15years.TotalN,availableP,andextractableKwerelower2-yearsand5-yearsafterthefirebutarehigherthanunburnedplotafter15-years.Availablenitrogen(NO3^-andNH4^+)remainunchangedorhigherthanB0inburnedpatches.SoilpH,BulkDensity,WaterHoldingCapacity,andElectricalConductivitywaslowerinitiallyafterthefire.Forestfireshaveaffectedsoilpropertiesconsiderably.Theresponseofsoilpropertiesvariedwithyearsafterfireandsoildepth.Conclusion:Forestfiresoccurveryfrequentlyinthestudyarea.Significantquantitiesofcarbonandtotalnitrogenarelosttotheatmospherebyburningoflitter,duff,andsoilOM.Becausenitrogenisoneofthemostimportantsoilnutrients,therecaptureofNlostbyvolatilizationduringafiremustreceivespecialattention.Long-termstudiesarerequiredtobetterunderstandtherecoveryofsoilnitrogen.

简介：Inaspectofthescaleofworks,theThreeNorthShelterbeltProgramisuptonowthemostmagnificentprojectofforestryecologicalconstructionintheworld.Attheendof2000,the1st,2nd,and3rdperiodsofconstructioninthe1stphase(1978-2000)hadbeencompleted.Basedonfuzzycomprehensiveevaluationmethod,thepaperisabouttheresearchesonpost-evaluationinthe1stphaseaimsoftheThreeNorthShelterbeltProgram.Theconclusionobtainedisthattheaimsarepartlysuccessful.

简介：Nutrient-poor,sandysoilsformtheprevailingsubstrateatpost-miningsitesoftheLusatianregion(Brandenburg,Germany)andpresentachallengeforvegetationdevelopment.Westudiedtheorganicacidquantityandcompositionofthreecommonlyoccurringpioneerplantspecies,thelegumesLotuscorniculatusL.andTrifoliumarvenseL.andthegrassCalamagrostisepigeios(L.)Roth,todetermineifplantgrowthandexudationdifferedwith(non-sterilizedsoil)andwithout(sterilizedsoil)anindigenoussoilmicrobialcommunity.Weinvestigatedwhetherorganicacidswerefoundintherhizosphereandsurroundingsoilandwhetherthisinfluencednutrientmobilization.Thisstudyconsistsoflinkedfieldinvestigationsandagreenhouseexperiment.Plantsweregrowninthegreenhouseineithersterilizedornon-sterilizedsandysoilfromareclamationsiteintheLusatianmininglandscape(WelzowSu¨d,EastGermany).Aftersevenmonths,theplantbiomass,rootmorphology,organicacids,andwater-solublenutrientsandrootcolonizationwitharbuscularmycorrhizalfungi(AMF)anddarkseptateendophytes(DSE)wereanalyzed.RootsofallthreeplantsinthefieldandgreenhouseexperimentswerehighlycolonizedwithAMF.CalamagrostisepigeiosandT.arvensehadasignificantlyhighercolonizationfrequencywithDSEthanL.corniculatus.Thequantityandcompositionoforganicacidsstronglydifferedamongplantspecies,withthehighestnumberoforganicacidsfoundforL.corniculatusandlowestforC.epigeios.Thequantityoforganicacidswasgreatlyreducedinallplantsundersterilizedsoilconditions.However,thecompositionoforganicacidsandplantgrowthinsterilizedsoilwerereducedforbothlegumes,butnotforC.epigeios,whichhadahigherbiomassundersterilizedconditions.Changesinnutrientconcentrationsinthefieldrhizospheresoilrelativetothoseinthecontrolweremeasurableaftersevenmonths.Whilethespectrumoforganicacidsandthegrowthoflegumesseemedtobedependentonahighly