DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 9-10/2016 str. 48     <-- 48 -->        PDF

procijeniti ishranjenost šumskoga drveća s N, provedena su tijekom samo jednoga vegetacijskoga razdoblja. U skladu s tim, njihovi rezultati zapravo dokazuju samo to da je na temelju CCI-a izmjerenoga pomoću klorofilmetra moguće uspješno procijeniti ukupnu koncentraciju N u lišću. To je potvrđeno prilično snažnom i statistički signifikantnom povezanošću CCI-a i ukupne koncentracije N u lišću.
Međutim, rezultati ovoga istraživanja provedenoga tijekom dva vegetacijska razdoblja, uzevši u obzir različite tipove lišća koji su tijekom vegetacijskoga razdoblja često puta zastupljeni u krošnji, dovode u pitanje brzu, jednostavnu, jeftinu i nedestruktivnu procjenu ishranjenosti hrasta lužnjaka s N pomoću klorofilmetra. Naime, dinamika N u različitim tipovima lišća pod utjecajem produkcije tercijarnih izbojaka potaknute mineralnom gnojidbom i povoljnim meteorološkim prilikama može se značajno razlikovati od godine do godine, odnosno od mjeseca do mjeseca tijekom vegetacijskoga razdoblja. To ne utječe značajno na povezanost CCI-a i koncentracije ukupnoga N u lišću. Međutim, značajno utječe na parametre kalibracijskih jednadžbi (posebno Y-odječke), što uglavnom onemogućuje da jednom konstruiranu kalibracijsku jednadžbu istovremeno koristimo za procjenu ukupnoga N u različitim tipovima lišća.
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