简介:采用封闭罩-气相色谱法观测研究了干旱胁迫对长白山阔叶红松林的几种优势树种-红松(Pinuskoraiensis)、水曲柳(Fraxinusmandshurica)、胡桃楸(Juglansmandshurica)、椴树(Tiliaamurensis)和蒙古栎(Quercusmongolica)叶片N2O排放,并同步测定5种树木叶片净光合速率、呼吸速率和气孔导度.结果表明:土壤水分胁迫明显降低树木叶片气孔导度、净光合速率和N2O排放速率,叶片气孔是树木N2O排放的主要通道.树木N2O排放以白天为主,在相同的水分条件下,不同的苗木有不同的N2O排放速率,同种苗木的N2O排放随干旱胁迫的加重而减少,在受到不同干旱胁迫时,针叶树红松N2O的排放速率降至正常水分条件下的34.43%和100.6%、阔叶树种N2O排放平均降至31.93%和86.35%.不同干旱胁迫的红松、水曲柳、胡逃楸、椴树和蒙古栎幼树叶片N2O排放速率为34.43、14.44、33.02、16.48和32.33ngN2O.g-1DW.h-1.图1表1参12.
简介:Thetitlecompounds4,4'-oxobis(propham)((?)n)(C20H24N2O5,Mr.=372.41)wassynthesizedbytheadditionreactionofcorresponding4,4'-oxobisphenyldiisocyanatewithisopropanol.ThecrystalstructurewasdeterminedbyX-raydiffractionmethod.Thecrystalistriclinicsystem,spacegroupP-1witha=8.5107(17),b=9.1164(18),c=14.5701(3)A,α=80.44(3),β=85.25(3),γ=62.88(3)°,V=992.2(3)A3,Z=2,Dc=1.247g/cm3,F(000)=396,R=0.0520,wR2=0.1434for4336observedreflectionswith[I>2σ(I)].X-rayana...
简介:Inordertoexplorethefeasibilityofcryopreservationondormantforesttreeseeds,theseedviabilityof4species(Malusbaccata,Prunusdavidiana,P.armenicaandAmygdalupersica)withmoisturecontent(MC)changingwastestedafter30-daystorageinliquidnitrogenof-196℃.Theresultsshowedthatallthe4speciesofseedscankeepastableviabilityaftercryopreservation.Intheprocedure,theoptimumMCwas48g/kgforM.baccata,27g/kgforP.davidiana,31g/kgforP.armenicaand45g/kgforA.persica,...
简介:KafangTownship,XinxianCountyofHenanProvinceislocatedinthehinterlandoftheDabieMountainborderingHenanandHubeiprovinces.Thistown...
简介:Thecorrosiveratesof4typesofmetalsaswellasepoxy-coatedmetalinavarietyofpreservativesderivedfromdifferentcoppersourcesandingredientsweremeasuredinthispaper.Themainresultsshowthat:CCAislesscorrosivetoredbrassandQ235Asteelthanothercopperformulations;Copper-basedpreservativessuchasACQandCuAzderivedfrombasiccupriccarbonateorcuprichydroxidearemuchlesscorrosivetoQ235Asteelthanthosefromcupricsulfate;EthanolamineislesscorrosivetoQ235AsteelthanammoniainACQderivedfromcuprichydroxide,whileotheringredientsarethesame;Epoxyresincoatingcouldbeusedforprotectingredbrass,Q235Asteelandzinchot-dippedgalvanizedmildsteelfromcorrosion.
简介:Afragmentwithabout798bpofcabgenewasamplifiedfromthefirststrandofMoso(Phyllostachysedulis)cDNAthroughRT-PCRmethod,namedascab-PhE4(cabgene4fromPh.edulis).Thecab-PhE4(GenBankaccessionnumber:EF405878)geneencodes265aminoacid.Thebioinformaticsanalysisindicatedthattheproteinencodedbycab-PhE4hasachlorophylla/b-bindingdomain(64th-232ndposition),aproteinkinaseCphosphorylationsite(33rd-35thposition),aN-myristoylationsite(169th-174thposition),andaninvolucrinrepeat(207th-216thposition).Theaminoacidsequenceofcab-PhE4showedhighsimilaritywiththecabgenesofZeamays,Triticumaestivum,Musaacuminata,PanaxginsengandOryzasativa,morethan90%,respectively.