Temperature influence on n mineralisation potential in different land uses in artvin, turkey
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In this study, effects of different temperatures (10, 15 and 20°C) on N mineralisation po- tential were investigated in young spruce stands, old spruce stands with and without Rhododendron ponticum understory, and adjacent grasslands in the Genya mountain, Artvin, Turkey. Soil samples were taken from surface 0–15 cm soil depth and incubated in standard laboratory conditions (60% water holding capacity (WHC)) to determine mineralisation potential for 63 days period. Soil N mineralisation rates differed with temperature and vegetation type. Mineralisation potential at 10°C temperature was greater in spruce stands with Rh. ponticum understory (108.90 kg N/ha/63 days) than in the other sites. On the other hand, mineralisation potentials at 15 and 20°C were the greatest in grassland (103.51 kg N ha/63 days and 94.12 kg N ha/63 days) sites compared to other sites. There were positive correlation between N mineralisation potential and soil total nitrogen content (% and kg/ha) and negative correlation between N mineralisation potential and C/N rate.