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To clarify the effect of enhanced UV-B radiation on soil nitrogen transformation and its biological processes in paddy fields, the effects of enhanced ultraviolet-B radiation (0, 2.5, 5.0 and 7.5 kJ m −2 ) on soil nitrogen transformation and N 2 O emission, functional microbial quantity, enzyme activity, and gene expression during the growth period (tillering, jointing, booting and maturity stage) of rice were investigated in situ in a rice paddy field in the Yuanyang terraces, Yunnan Province, southwest China. The results show that UV-B radiation decreased the NH 4+ -N content, increased the NO 3– N content in the rhizosphere, decreased N 2 O emissions from paddy fields, and significantly affected the properties of soil nitrogen transforming microorganisms. The 5.0 kJ m −2  UV-B radiation increased the quantity of ammonifying bacteria and ammonia oxidizing bacteria by 18–160% and 34–151%, respectively, decreased the urease activity in the rice rhizosphere by 11.9–27%; and significantly increased the expression of AOB-amoA and nosZ genes. Thus, the enhanced UV-B radiation increased the ammonia-oxidizing bacteria and AOB-amoA and nosZ gene expression, promoted the transformation of NH 4+ -N to NO 3– N in the rice rhizosphere, and reduced N 2 O emissions in the paddy field.

Effects of enhanced UV-B radiation on nitrogen transformation and functional biological properties in the rice rhizosphere