Soil respiration in apple orchards, poplar plantations and adjacent

grasslands in Artvin, Turkey

 

Aydin Tufekcioglu*, Ali Kemal Ozbayram and Mehmet Kucuk

Department of Forestry, Artvin Coruh University - 08000, Artvin, Turkey

(Received: April 18, 2008; Revised received: August 02, 2008; Accepted: September 25, 2008)

 

Abstract: In this study, influence of land-use type on soil respiration was investigated in poplar plantation, apple orchard (apple trees with understory grasses) and adjacent grassland sites in Seyitler Area, Artvin, Turkey. Soil respiration was measured approximately monthly in three sampling plots in each land use type from January 2005 to November 2005 using the soda-lime technique. Mean daily soil respiration ranged from 0.63-3.59 g C m^-2 d^-1.? Mean soil respiration in apple orchard, poplar plantation and grassland sites were 1.98, 1.45 and 1.12 g C m^-2 d^-1, respectively. Mean soil respiration was significantly greater in apple orchard than in poplar plantations and grasslands. Seasonal changes in soil respiration were related to soil moisture and temperature changes. Mean soil respiration rate correlated strongly with subsurface soil (15-35cm) pH (R = -0,73; p<0.05), sand content (R= 0.96, p<0.001), soil silt content (R= -0.75; p<0.05), soil clay content (R= -0,83; p<0.001) and organic matter content (R= 0,88; p<0.001). No significant correlations were observed between soil respiration and surface (0-15 cm) soil properties and root biomass. Overall, our results indicate that apple orchards with understory grasses have higher soil biological activity compared to poplar and grassland sites.

Key words: Soil biological activity, Apple orchard, Grasslands, Carbon cycle, Artvin

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