Ultraviolet-A Radiation Accelerated N2O Emission in Winter-Wheat Ecosystem

Extensive research has been done to find the effect of enhanced UV-B (280-320 nm) radiation on ecosystem, however, the available information related to the effect of UV-A (320-400 nm) on ecosystem is limited. It merits further studies due to the facts that UV-A constitutes a major portion of the solar radiation and passes through the stratospheric ozone layer almost unattenuated. To investigate the impact of UV-A radiation on trace gases N₂O emission from winter-wheat ecosystem, outdoor pot experiments with simulating 0%(CK) and 20% (T) supplemental of UV-A were conducted, and static dark chamber-gas chromatograph method were used to measure N₂O fluxes. Results indicated that enhanced UV-A radiation increased N₂O fluxes in bare soil, which N₂O fluxes of T were 2.86 times larger than that of CK (p=0.059), also accelerated significantly N₂O emission from winter-wheat ecosystem, which N₂O fluxes of T were 1.33 times larger than that of CK (p=0.012).