Fiatal somogyi kocsánytalan tölgyek és csertölgyek szárazságérzékenységének összehasonlító vizsgálata
DOI:
https://doi.org/10.17164/EK.2021.008Kulcsszavak:
kocsánytalan tölgy, csertölgy, dendrokronológia, aszályAbsztrakt
Jelen munkánkban somogyi kocsánytalan tölgyek és csertölgyek (Quercus petraea, Q. cerris) aszályra adott növekedési reakcióját vizsgáltuk, egy csapadék gradiens mentén. Az értékeléshez 136 évgyűrűmintát használtunk fel, valamint az aszályérzékenység meghatározásához dendroökológiai számításokat végeztünk. A vízhiányt a talaj vízháztartásán alapuló nedvesség-stressz index felhasználásával becsültük meg. Az eredmények alapján, mindkét fafaj évgyűrű képzését leginkább az adott év nyári csapadék mennyisége határozta meg, de a két fafaj eltérő stratégiát folytat az aszályos időszakok átvészelésére. A csertölgy érzékenyebben reagált az aszályokra, mint a kocsánytalan tölgy, amely a faj aszályokkal szembeni kisebb ellenállási és nagyobb regenerálódási képességéből adódott. A csertölgy esetén a növekedés visszaesése egyenesen arányos volt a nedvesség-stressz érték növekedésével, míg a kocsánytalan tölgy az egyre erősödő szárazságra erőteljesebb növedék visszaesést mutatott, ami a faj kisebb mértékű rugalmasságára utal. Mindezek alapján úgy látszik, hogy a csertölgy jobban ellenáll az aszályoknak, mint a kocsánytalan tölgy, így akár versenyképesebb is lehet az előre jelzett klímaváltozás kapcsán.
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