Vpliv dejavnikov okolja na kapaciteto za mineralizacijo ogljika in dušika v barjanskih tleh = Effect of environmental factors on the capacity for carbon and nitrogen mineralization in peat soil
Zupančič Justin, Maja ; Mahne, Ivan
Intenyivna kmetijska raba barjanskih tal pospeǴuje procese mineraliyacije, karvodi tudi v yniÍevanje nivoja tal. V laboratorijskih raymerah smo prouřevali vpliv dostopnosti kisika, pH tal in ...yaloÍenosti y mineralnimi hranili na kapaciteto ya mineraliyacijo pri vyorcih neobdelovanih barjanskih tal. Meritve produkcije CO2 in 2N KCl iymenljivih ionskih oblik N med 42 oy. 92-dnevno inkubacijo pri sobni temperaturi, so sluÍile ya vrednotenje mineraliyacijskega potenciala. Prisotnost kisika ob sořasni odstranitvi kislosti iyyove intenyivno mineraliyacijo organske snovi, ki doseÍe 12,70 mgC/g Íe v Ǵtirih dneh, v primerjavi y 0,62 mgC/g suhih tal pri vyorcih y ohranjeno kislostjo (pH4). V podaljǴani inkubaciji poteka mineraliyacija y bolj umirjeno dinamiko in po 92. dnevu je v vyorcih y odstranjeno kislostjo dodatno mineraliyiranega Ǵe 10,95 mgC/g. Odstranitev kislosti omogoři intenyivno mineraliyacijo tudi v odsotnosti kisika: v 42. dneh je koliřina neto mineraliyiranega duǴika 945,0 mg/g suhih tal, v primerjavi y 245,1 mg/g pri kontrolnem vyorcu y ohranjeno kislostjo.
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