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《第三节 植物根系对水分的吸收（absorption of water by third plant roots）》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、第三节植物根系对水分的吸收（Absorptionofwaterbythirdplantroots）AbsorptionofwaterbythirdplantrootsPartofrootwaterabsorptionTwo.ThewayofrootwaterabsorptionThree.ThemechanismofrootwaterabsorptionFour,theinfluenceofsoilconditionsofwaterabsorptionCharacteristicsof1.rootsystem:Rootsy
2、stemisthemainorganofplantabsorbingwaterPartofrootwaterabsorptionElongationzoneMeristematiczoneRootcapTheroothairzoneRootvolume,roothairnumberBlackwheatinthebox,andthemeasurementoftheroothairs,atotallengthoftenthousandkilometers,adaylongoutofthenewrootandroothairat
3、otallengthof5kilometers.IthasadeeprootandawidedistributionTherootofwheatissoluble1.5-2m,cornismorethan2m,appletreeis10-12meters.2.thepositionofrootabsorbingwaterThemainpartofrootabsorptionisatthetipoftheroot,TheroothairzoneElongationzoneMeristematiczoneRootcapInth
4、etransplantationofseedlingsshouldbeavoidedwhenrootinjury.roottipThestrongestwaterabsorptioncapacityThereasonofthewaterabsorptioncapacityoftheroothairzone:(1)theroothairzonehasmanyrootabsorptionarea(5~10times);(2)theexternalroothairzonecoveredbypectinviscosity,stro
5、nghydrophilicity,andisbeneficialtotheadhesionandabsorptionofsoilparticles;(3)conductingtissueoftheroothairzonedeveloped,theresistancetowatermovementInthetransplantationofseedlingsshouldbeavoidedwhenrootinjury.Two.Thewayofrootwaterabsorption1.plastidpathway2.apopla
6、sticpathwayTheradialtransportpathwayfromthesoilthroughroothairs,cortexandendodermis,parenchymacellsintothewatercolumntubetwo:Itreferstothemovementofwaterfromthecytoplasmofacellthroughplasmodesmatatothecytoplasmofanothercell.Slowermovingspeed.Plastidpathwayandapopl
7、asticpathwayofrootwaterabsorptionTwo.Thewayofrootwaterabsorption1.plastidpathway2.apoplasticpathwayWatermovesthroughthecellwall,intercellularspace,etc.withoutprotoplasm,andmovesrapidly.Theapoplastoftherootisdividedintotwopartsbytheendodermis:theapoplastoutsidethee
8、ndodermisandtheapoplastoutsidetheendodermisThestripoftheendothelialcellwallWaterentersthecellonlythroughtheprotoplasmoftheendodermis.Thatis,enteringthep
