[Dynamics of dry deposition velocities (Vd) of atmospheric SO2 on rapeseed/rice rotation systems in selected area of south China].
With the profile meteorological data collected from the farmland micro-meteorological experimental substation, Experiment Station of Red Earth Ecology, Yingtan, Jiangxi, Chinese Academy of Sciences during rapeseed/rice rotation from Nov. 1998 to Oct. 1999, the surface layer turbulence characteristic parameters (u*, theta*, L) and the atmospheric SO2 dry deposition velocities (Vd) were calculated. The results indicated that the hourly mean Vd of SO2 dry deposition was ranged from 0.124 to 0.897 cm.s-1 (mean +/- SE = 0.507 +/- 0.167 cm.s-1), and its regular dynamic pattern was as follows: it was always higher at daytime than at night, and the mean Vd of SO2 dry deposition during March-August(0.611 cm.s-1) was obviously greater than that during Sept.-Dec. and Jan.-Feb. (0.401 cm.s-1). The mean Vd of SO2 dry deposition during various crop growth stages was decreased as the order of rice (0.605 +/- 0.093 cm.s-1) > rapeseed (0.491 +/- 0.166 cm.s-1) > follow (0.342 +/- 0.174 cm.s-1).
Hu
Zhengyi
Z
LMCP, Institute of Soil Science, Chinese Academy of Science, Nanjing 210008, China. zhyhu@issas.ac.cn
Xu
Chengkai
C
Cao
Zhihong
Z
Wang
Tijian
T
Zhao
Yanwen
Y
D001272:Atmosphere; D029741:Brassica rapa / Q000254:growth & development*; D012275:Oryza / Q000254:growth & development*; D013458:Sulfur Dioxide / Q000032:analysis*; D013997:Time Factors
D013458:Sulfur Dioxide