中国南方典型地区油-稻轮作条件下大气SO_2干沉降速率动态变化  

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

作　　者：胡正义[1] 徐成凯[1] 曹志洪[1] 王体健[2] 赵言文[3] 

机构地区：[1]中国科学院南京土壤研究所土壤圈物质循环重点实验室,南京210008 [2]南京大学大气科学系,南京210008 [3]南京农业大学,南京210095

出　　处：《应用生态学报》2003年第9期1543-1546,共4页Chinese Journal of Applied Ecology

基　　金：国家基础研究发展规划项目(G1999011805);中国科学院知识创新工程领域前沿项目(ISSASIP0205);中国科学院红壤生态试验站资助项目

摘　　要：以1998年11月～1999年10月中国科学院红壤生态试验站农田小气候观测站气象梯度资料(温度、风速、气压),计算近地面湍流特征参数(u~*、θ~*、L),然后采样阻力模式计算SO_2干沉降速率(V_d),研究了该地油-稻轮作条件下大气SO_2干沉降V_d动态变化。结果表明,一年中大气SO_2于沉降V_d时平均年均值0.124～0.897cm·s^(-1)(mean±SE=0.507±0.167cm·s^(-1)).一年中大气SO_2干沉降V_d存在如下规律性:白天>晚上。3～8月份SO_2 V_d平均值(0.611 cm·s^(-1)大于9～12、1～2月份SO_2 V_d平均值(0.401 cm·s^(-1))。水稻生长期间(0.605±0.093 cm·s^(-1))>油菜(0.491±0.166 cm·s^(-1))>休闲(0.342±0.174 cm·s^(-1))。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 (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).

关 键 词：二氧化硫 干沉降速率 大气沉降 油菜 水稻 

分 类 号：X171.1[环境科学与工程—环境科学]