[Influence of enhanced UV-B radiation on respiration rate and N2O emission from soil-winter wheat system].
To investigate the impact of enhanced UV-B radiation on respiration rate and N2O emission from soil-winter wheat system, outdoor pot experiments with simulating 20% supplemental of UV-B were conducted, and static dark chamber-gas chromatograph method were used. Results indicated that the enhanced UV-B radiation did not change the seasonal pattern of respiration rate and N2O emission. Enhanced UV-B radiation declined the rate of soil-winter wheat system's respiration but had no significant impact on N2O emission in turning-green stage. While enhanced UV-B radiation declined both respiration rate and the N2O emission in elongation-pregnant stage. From heading to maturity, the respiration rate and N2O emission from soil-winter wheat system were not found to be significantly difference under UV-B radiation compared with ambient conditions. A further analysis suggested that enhanced UV-B radiation declined significantly cumulative amount of N2O from soil-winter wheat system from wheat turning green to full heading stage, while no significant impact occurred from full heading to maturity.
Hu
Zheng-Hu
ZH
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China. zhhu@nuist.edu.cn
Jiang
Jing-Yan
JY
Niu
Chuan-Po
CP
Sun
Wen-Juan
WJ
Huang
Yao
Y
D019069:Cell Respiration / Q000528:radiation effects; D017753:Ecosystem; D009609:Nitrous Oxide / Q000378:metabolism*; D012621:Seasons; D014908:Triticum / Q000378:metabolism* / Q000502:physiology; D014466:Ultraviolet Rays
D009609:Nitrous Oxide