Dynamics of dry deposition velocities (Vd) of atmospheric SO2 on rapeseed/rice rotation systems in selected area of South China

Abstract

Abstract: 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^*,θ^*,L) and the atmospheric SO₂ dry deposition velocities (V_d) were calculated.The results indicated that the hourly mean V_d 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 V_d 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 V_d 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).

CLC Number:

S181

HU Zhengyi, XU Chengkai, CAO Zhihong, WANG Tijian, ZHAO Yanwen. Dynamics of dry deposition velocities (V_d) of atmospheric SO₂ on rapeseed/rice rotation systems in selected area of South China[J]. Chinese Journal of Applied Ecology, 2003, (9): 1543-1546.

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Dynamics of dry deposition velocities (V_d) of atmospheric SO₂ on rapeseed/rice rotation systems in selected area of South China

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