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| Combined effect of enhanced UV-B radiation and straw addition on respiration rate and N2O emission from soil-soybean system |
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Abstract To investigate the combined influence of enhanced UV-B radiation and straw addition on respiration rate and N2O emission from soybean ecosystem, field experiments were carried out during soybean growing season. Enhanced UV-B radiation significantly declined mean respiration rate (MRR) and mean N2O flux (MNF). During the trefoil-branching stage, flowering-podding stage, filling-ripening stage and whole growth stage, MRR were declined by 59.88%,65.47%,67.35% and 64.44%, respectively, MNF were decreased by 37.94%,24.61%,48.42% and 34.16%, respectively. Straw addition (S) had a positive effect on respiration rate, which increased by 59.88%,61.50%,99.16% and 64.44% in above 4 stages. Though S treatment declined MNF of whole growth stage, there was no significant difference between S and the control (C) (P=0.236). Combined treatment of straw addition and enhanced UV-B radiation (SU) significantly accelerated the reapiration rate, declined MNF of whole growth stage, but there was no significant difference in MNF between SU and C (P=0.229).
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Received: 31 August 2009
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