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Response of Morphological Character to Aridification of Habitat for Two Plants of Genus Kobresia

2种嵩草属植物形态特征对生境干旱化的响应



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,2016,36(4):0796-0803
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犚犲狊狆狅狀狊犲狅犳犕狅狉狆犺狅犾狅犵犻犮犪犾犆犺犪狉犪犮狋犲狉狋狅犃狉犻犱犻犳犻犮犪狋犻狅狀狅犳犎犪犫犻狋犪狋犳狅狉
犜狑狅犘犾犪狀狋狊狅犳犌犲狀狌狊犓狅犫狉犲狊犻犪
XIEYanjie,ZHUYuhuai,ZHANGDacai,LIShuangzhi
(FacultyofForestry,SouthwestForestryUniversity,Kunming650224,China)
犃犫狊狋狉犪犮狋:10sampleplotsweresetalongagradientofaridityinthealpinemeadow,theDongdaMountain
inSoutheasternTibet.Species犓狅犫狉犲狊犻犪狆狔犵犿犪犲犪and犓.犺狌犿犻犾犻狊wereselectedasthestudymaterials,
andlinerregressionanalysiswasusedtoanalyzethecorrelationbetweentheamountofleafandnumerical
valueofothercomponentsofplants,suchasamountoframet,diameterofbasestem,amountofrootand
lengthofroot.Theslopesoflinerregressionswereusedtomeasuretheeffectoftilering,germinationa
bilityofleaf,effectofrootbranchingandrootelongating.Theresultsshowed:(1)leafamountandnu
mericalvalueofothercomponentsofthetwo犓狅犫狉犲狊犻犪plantsweresignificantlypositivelinercorrelated(犘
<0.01).(2)Withaggravationofaridification,rametamountof犓.狆狔犵犿犪犲犪increased,whilethatof犓.
犺狌犿犻犾犻狊decreased.Fortwoplants,thetileringeffectdecreased,whichindicatedthatleafamountofper
rametreducedduetothearidification.(3)Diameterofbasestemandgerminationabilityoftwoplantsde
creasedwithaggravationofaridification.Germinationabilityof犓.狆狔犵犿犪犲犪wasincorrespondencewith
droughtgradient;therewasnoregularvariationofgerminationabilityof犓.犺狌犿犻犾犻狊alongthegradientof
aridification,butitdecreasedtoanextremevaluewhenhabitatspresentedtobeverydry.(4)Forplant
犓.狆狔犵犿犪犲犪,itsamountandlengthofrootbothincreased;forplant犓.犺狌犿犻犾犻狊,itsrootlengthin
creased,butrootamountshowedirregularvariation;theeffectofrootbranchingandrootelongatingboth
decreasedalongthegradientofaridification.Insummary,thisstudyshowedthatthemostsuitablehabitat
for犓狅犫狉犲狊犻犪plantswasmarshlandwithshalowwater.犓.狆狔犵犿犪犲犪canbetteradapttoaridificationand
distributesatawiderangebyloweringgerminationrateofleaffordecreasingtranspiration,increasing
rametamountforincreasingthespatialoccupationability,andincreasingrootamountandlengthtoen
hancetheabilitytoabsorbsoilwater,while犓.犺狌犿犻犾犻狊responsestoaridificationonlybyloweringgermi
nationrateofleafandincreasingrootlength,whichshowsaweakadaptationtoaridhabitatanddistributes
atanarrowerrange.
犓犲狔狑狅狉犱狊:aridification;effectoftilering;germinationabilityofleaf;effectofrootbranching;effectof
rootelongating
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Table1 Amountofindividualindifferentsampleplots
fortwospeciesofgenus犓狅犫狉犲狊犻犪
$|Species
Tw2× No.ofsamples
1 2 3 4 5 6 7 8 9 10
?@}f
犓.狆狔犵犿犪犲犪 238426257210153 94 82 44 41 32
~7}f
犓.犺狌犿犻犾犻狊 139223152127114 \ 62 38 \ \
Ò1 56N@PQ8pTPop¨9Ò
Fig.1 Locationofthestudyareaandsketchmapofsampleplotssetting
897 ! " # $ % &                   363
Ò2 <ˆ‚d¾l<ˆ‚R€‚dO
Fig.2 Variationoframetamount,andthecorrelationbetweenamountsoframetsandleaves
Ò3 ‰,Š‹d¾l‰,Š‹R¹ˆ€‚dO
Fig.3 Variationofdiameterofbasestems,andthecorrelationbetweendiameterofbasestemandleafamountforeachramet
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