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Populationsofsilverbirchgrowingonpost-industrialwastedumpinggrounds
representdifferentmorphotypescomparedtobirchpopulationsgrowingin
semi-naturalhabitats.
Therearedifferencesinfecundity,theconditionofseeds(e.g.germination
capacityandenergy)ofbirchtreesgrowingondumpinggroundscomparedtotrees
insemi-naturalhabitats.
Seedlingsdevelopingfromseedscomingfromheapsaremoreimportantin
therestorationofdumpsthanseedlingscomingfromsemi-naturalpopulations.
TheresearchaimedatevaluatingthecharacteristicsofBetulapendula
populationsgrowinginconditionsofdiversifiedanthropopressurethrough:
1.Selectedlifehistorytraits:
1parametersofthesizeandbiomassofspecimens
1evaluationofspecimens’fertility
1reproductionefficiency
2.Determinationoftheconditionofbirchspecimens:
1includingselectedstressindicatorsintheresearch(e.g.thecontentof
chlorophyll)
3.Evaluationofabioticandbioticfactorsresponsibleforthespatialdistributionof
seedlings.
Theresultsoflong-termresearchesonsettlementprocessesbyparticular
speciesinpost-industrialdumpinggroundsmayfacilitateplanningworksrelatedto
restorationanddevelopmentofsuchareas(Bradshaw1989;Rostański2006).
Adaptationasanexpressionofadjustmentby
aspeciestoenvironmentalconditions
Inthenature,environmentalfactors,bothbioticandabioticones,donot
influenceorganismsindividually,andtherelationshipsbetweenthemarevery
complicated.Thefactthatlifeprocessesofplantsareinfluencedbynumerousand
changeableenvironmentalfactors,testifiestorelativelybroadlimitsoftheir
tolerance(Barcikowski1994;Green1994;Kocjan1994).Nevertheless,theselimits
doexist.Ifafactorreachesextremevalues,thenanorganismlosesitsviabilityand
isexposedtoinjuries,andmayevenvanish.Potentially,allenvironmentalfactors
mayexertsomeinfluenceonaplant.Infact,notallofthemareequallyimportant
inrelationtoaspecificphenomenon,notallofthemparticipateinit.Eachofthem
becomescruciallyimportantwhenitsvalueisapproachingthetolerancelimitsof
agivenorganism(Daubenmire1973;Falińska1996).Itisworthwhiletoemphasize
thatminimum,maximumandoptimalvaluesarenotconstant,butchangeunder
theinfluenceofotherfactorsaffectingaplant.Inthistremendousgameof
changeablelifeconditions,thereisyetanotherveryimportantelement,i.e.
requirementsofaplant,whicharenotstableandchangeindifferentstagesofits
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