Effects of different carbon and nitrogen managements on soil respiration of spring maize farmland
This research was conducted to explore the effects of C&N management and the main environmental factor, namely soil temperature on soil respiration during spring maize growth period. The results showed that comparing with no fertilizer treatment, carbon and nitrogen managements improved soil respiration obviously, and the emission of CO2 ( y) had been effec-tively controlled with the use of fertilizer ( x1 ) , straw ( x2 ) and manure ( x3 ) reasonably. The soil respiration could be predic-ted by the ternary quadratic equation y=2. 2-0. 1x1 +0. 2 x2 -0. 2x1 x3 +0. 2 x21 +0. 1 x22 +0. 1 x23 , when x1 =0. 5, x2 = -1, x3 =0. 5. It reached the minimum respiration rate value of 2. 075 μmol?m-2?s-1 , when the amount of fertilizer was 131 kg?ha-1 , straw amount was 1 500 kg?ha-1 , manure amount was 3 750 kg?ha-1 . The relationship between soil respiration and soil temperature was explained by the equation y=aTb , the variability between soil temperature and soil respiration rate could be explained was 46. 9% ~ 81. 2%; the range of temperature-sensitive coefficient Q10 was 1. 86 ~ 4. 71.