简介：TheroleoforganicmatterintheformationandstabilityofsoilaggregatesinmulberryplantationintheHang-Jia-HuPlain,northernZhejiangProvince,wasevaluatedinthisstudy.Apositivecorrelationwasfoundbetweenwater-stableaggregatecontentsandorganicmattercontentsinthemulberryplantationsoils,whichsupportedthehypothesisthatorganicmatterwasthemaincementingagentinformationofaggregates.Aclosecorrelationwasalsofoundbetweenstabilityofaggregateandorganicmattercontents.Regressionanalysisshowedthattotalnitrogencontentwasalsoanindicatorofwater-stableaggregatecontentandstability.Theaggregatesizedistributionindicatedthatthewater-stableaggregates1～0.25mmindiameterwerethemajorcomponentoftheaggregatesinthemulberryplantationsoils.Theorganicmattercontentsofaggregatesrangingfrom5to0.25mmindiameterincreasedwiththedecreaseofaggregatesizes,andtheaggregates1～0.25mmindiameterhadthemaximumorganicmattercontent.

简介：Lichensplayanunparalleledlyvitalroleinweatheringandsoil-formingprocessesinAntarcticregion,InthisstudysomerelatedchemicalcomponentsandmicromorphologicalanalyseshavebeencarriedoutonthesamplesoftheweatheredrocksandthelichensgrownonthemfromFilesPeninsula,Antarctic,Theresultsindicatiedthatthemajorchemicalcomponentsinthebioweatheringsurfacelayerofthesampledrockshavebeenobviouslyalteredandtheweatheringpotentialinthislayerhasgreatlydecreasedbyandaveragerangearound4.66percentin4samples,Intheweatheringsurfacelayerferruginiztionofsomemineralsinvaryingdegresswasseenbymeansofmicroscopicexaminationthroughthethinsectionoftheweatheredrocks,anditsproductsprovedtobedominatedbyhematitie,limonite,goethiteandfreeironoxidesMeanwhile,thestudysuggestedthatthedissolutionandabsorptionoflichensbytheirsecretionacceleratedtheprocessofcalcitizationofmineralsinthebio-weatheringsufacelayer,Eventually,theresultsalsoshowthatdifferentspeciesoflichensplaydifferentrolesinweatheringandsoil-formingproesses.