Az elsőbbségi hatás, a propagulumnyomás és a jelleghasonlóság alkalmazása inváziós fajok honos fajok vetésével történő visszaszorítására
Absztrakt
Az ökológiai restauráció létfontosságú a növényi invázió korlátozásában, az inváziókontroll és a biotikus rezisztencia növelése révén. Hipotézisünk szerint az elsőbbségi hatással, a honos fajok megnövelt propagulumnyomásával, valamint a jelleghasonlósággal erősíthető az invázió elleni biotikus rezisztencia. Kutatásunkban homokpusztagyepi modell fajokkal, kontrollált kísérletben teszteltük három különböző életformát és funkcionális csoportot képviselő inváziós faj és négy, jellegükben eltérő mértékben hasonló honos növényfaj kompetícióját. Az Asclepias syriaca esetében a magmennyiség és a jellegükben hasonlóbb vetett fajok voltak meghatározóak. A Conyza canadensis esetében mindhárom tényező szignifikáns hatással bírt. A Tragus racemosus esetében a honos fajok elsőbbségi vetése hátráltatta a csíranövények megtelepedését. Eredményeink alapján az inváziós fajok korlátozhatóak honos fajok vetésével, különösen nagyobb magsűrűség, valamint magkeverék használata esetén, továbbá, ha biztosítani tudjuk a honos fajok korábbi megtelepedését.
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