Effect of biochar application on soil respiration in a summer maize crop after five years

A field experiment was conducted to explore the effects of biochar application on changes in soil respiration component characteristics and influencing factors in the Shihezi 121st group, Xinjiang, five years after the treatment. Five treatments were applied, namely a single application of chemical fertilizer(T0)and applications of 15.75(T1), 31.50(T2), 63.00 t·hm-2(T3), and 126.00 t·hm-2 (T4)of biochar. The diurnal dynamics of soil respiration and heterotrophic respiration in sandy soil showed a single peak curve, with the peak value appearing at approximately 13:00. The daily average respiration rate of the T4 treated soil was 2.74 μmol·m-2·s-1, which was significantly higher than that of the other treatments(P2 emissions.