Effects of Different Soil Temperature and Reducing Soil Moisture Content on CO_2 Production

A pot experiment was conducted to examine the change in co_2 emission of the soil which was initially irrigated until it reaches 60% of the saturation and treated by different atmosphere temperatures. in the experiment, the temperature of the self-constructed system which the pots were placed were adjusted to 40, 36 and 32 °c, and the control pots left at room temperature were included in the experiment. irrigation was done only once at the start of the experiment. changes in soil temperature, soil moisture, co_2 emission and evaporation depending on time were determined until the 22nd day. result of the experiment showed the differences on temperature values between pot atmosphere and soil; however, a differences among 40 °c, 36 °c 32 °c and ambient temperature found to be 3.9, 3.3 and 4.7 °c, respectively. at the beginning of the experiment, the rate of reduction of the water applied to the soil increased with the temperature, while the highest decrease was recorded in the highest temperature application, the lowest decrease was obtained from room temperature. the last measurement day was 22nd day after the experiment conducted. measured water diminishes on that day were 81%, 73.6%, 66.6% and 47.5% for the temperatures of 40, 36, 32 °c and room temperatures, respectively. results revealed that temperature applications significantly increased co_2 emission (p<0.05) where the highest values observed at the second and third measurement day at 40 °c application and that values were 1.5 and 1.7 times higher than the control. the highest determined co_2 emission was in 40 °c treatment as 1.41 gm^-2 day^-1 at third measurement day while the lowest was 0.024 gm^-2 day^-1 at 15th measurement day at same temperature application.