Dynamics of algae number in humogley in various ecosistems

The aim of this research was to examine the dynamics of algae number in humogley in three different ecosystems (wood, meadows and arable land). The soil was sampled during four weather seasons throughout the year 2000 and samples were taken from three different depths: 0-1, 1-20 and 20-40cm. Number of algae depend on ecosystem type, soil depth and whether season. Among all the examined sites the highest number of algae was found in wood locality, afterwards in meadow site and arable land has shown to have the lowest number of algae. All the examined ecosystems have highest number of algae is in surface layers (0-1 cm) which decreases with depth, and is less present in arable soils comparing to non-arable soils. U radu je određena brojnost algi u tri različita ekosistema na ritskoj crnici (livada, šuma i njiva) u području makiškog rita, u toku 2000. godine. Uzorci su uzimani iz tri dubine zemljišnog profila: 0-1, 1-20 i 20-40 cm. Brojnost algi zavisi od tipa ekosistema, dubine zemljišnog profila i godišnjeg doba, kao i interakcije ovih faktora. U ekosistemima u kojima zemljište nije obrađivano konstatovana je statistički značajna razlika u odnosu na obrađeno zemljište. Najveća brojnost algi konstatovana je u šumskom ekosistemu a najmanja u oranici. Ukupan broj algi je najveći u površinskom sloju i sa dubinom zemljišnog profila opada. Opadanje brojnosti po dubini je veće u neobrađenim u odnosu na obrađeni ekosistem.