[Influence of enhanced UV-B radiation and straw application on soil respiration in soybean field].
Field experiment was carried out in 2008 in order to investigate the effects of enhanced UV-B radiation and straw application on soil respiration in soybean field. LI-8100 automated soil CO2 flux system was used to measure soil respiration under 20% enhanced UV-B radiation, straw application, 20% enhanced UV-B radiation + straw application and control. Environmental factors such as air temperature, soil temperature and moisture were also measured. Results indicated that supplemental UV-B radiation reduced soil respiration rate by 30.31%, straw application increased soil respiration rate by 14.51%, while enhanced UV-B radiation + straw application combined treatment had no significant effect on soil respiration. Enhanced UV-B radiation enhanced the carbon conversion rate of straw. Significant relationship were found between soil respiration rate and soil temperature under the control, enhanced UV-B, straw application, and enhanced UV-B + straw application, the fitting equation determined coefficients R2 were 0.434, 0.563, 0.451 and 0.513. The Q10 (temperature sensitivity coefficients) for soil respiration were 1.55, 1.91, 1.80 and 1.71, respectively. It was reflected that enhanced UV-B radiation, straw application and enhanced UV-B radiation + straw returning increased the Q10 for soil respiration.
Hu
Zheng-hua
ZH
College of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China. zhhu@nuist.edu.cn
Li
Han-mao
HM
Yang
Yan-ping
YP
Chen
Shu-tao
ST
Li
Cen-zi
CZ
Shen
Shuang-he
SH
D002245:Carbon Dioxide / Q000032:analysis / Q000378:metabolism*; D005308:Fertilizers; D018547:Plant Stems; D012987:Soil / Q000737:chemistry*; D013025:Glycine max / Q000254:growth & development* / Q000378:metabolism; D014908:Triticum; D014466:Ultraviolet Rays
D005308:Fertilizers; D012987:Soil; D002245:Carbon Dioxide