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1、StudyonLongitudinalGasPermeabilityofAir-driedMassonPineSapwoodv2④StudyonLongitudinalGasPermeabilityofAir..driedMassonPineSapwoodHOUZhuqiang:l:ZHANGLffeiGUANNingCHENGuihua2Abstract:Measurementofthelongitudinalgaspermeabilitywasmadeforair.driedsapwoodspec~men.
2、fromMassonpine(Pinusmassoniana).Resultsshowedthatair—driedMassonpinesapwoodwasoneofmemostDe肌ea_blesoftwoods.Theinvr,stigatedspecimenshadallaveragelongitudinalgaspermeabilityof4.60XlO一"m3/m,andtheperme"oilityrangedfrom1.06XlOto1.12XIOm/m-TheKruskal'WallisTest
3、indicatedthat,generally,therewasnocorrelationbetweenthelongitudinalgaspermeabilityandthetreesfromwhichspecimenswereprepared,andtreeheighthadnosignificanteffectonthelongitudinalgaspermeability.Keywoods:permeability,Massonpine(Pinusmassoniana),sapwood,Kruskal-
4、WallisTestINTRODUCTIONMassonpine(Pinusmassoniana)isamongtheimportantcommercialwoodsinChina(ChengJunqing1984;ZhengRenhuaeta1.2000).Permeabilityisoneofthemainpropertiesofwoodandhasbeenstudiedindetailforwoodpreservationandimpregnationinchemicalpulping(Siau1995)
5、.Duetoitsmuchsimplerprocedure,gaspermeabilityismeasuredmoreoftenthanliquidpermeability(Siau1995).ReportshavebeenpublishedconcerninggaspermeabilityofMassonpine(BaoFuchengeta1.1999;MiaoPingeta1.2000;YangWenbineta1.2000).PermeabilityofwoodvariesamongMassonpinet
6、reesandtheeffectofthetreeheightonthegaspermeability.IERIALSANDMETHODS1-1MaterialsSixplantationBeesofMassonpine(P.massoniana),growninDaqingshan,PingxiangCity,GuangxiZhuangAutonomousRegion,China,wereselectedastheinvestigatedmaterials.Fromheightof2.30m,twologsO
7、f1.50mlongweresuccessivelycutfromeachofwithinthesamewoodspeciesandbetweendifferentthetrees.Afterthelogswereseasonedforabout7ones(BaoFuchengeta1.1999;Siau1995;Smitheta1.1958).Littlework,however,hasbeendoneonthevariationinthegaspermeabilityofMassonpine.Theobje
8、ctiveofthepresentstudyistoinvestigatethedifferenceinthelongitudinalgaspermeabilitymonths,specimens,100.0mminlengthand20.0mm×20.0mmincross.section,weretakenfromthelogswiththeirlengthparalleltoits
