中文摘要：

通过田间小区SO2熏气试验，研究了不同生育期正常生长的水稻在SO2急性伤害条件下产量构成因子变化。结果表明，与正常条件下生长的水稻比较分析表明，SO2急性伤害对水稻产量构成因子的影响在品种和生育期之间表现出差异性，在分蘖期进行SO2熏气处理穗重、千粒重和每穗总粒数随熏气浓度的增加都有降低趋势；在拔节期进行SO2熏气处理后单株穗重与千粒重与对照试验相比也表现出一定的差异；在抽穗期进行SO2熏气处理后千粒重随SO2浓度增大表现出下降的趋势；在灌浆期进行SO2熏气处理对产量构成因子的影响规律性不明显。分蘖期进行熏气处理导致临稻10、圣稻13和阳光2003个品种水稻平均减产分别为：18．5％、32．3％、29．3％，拔节期：18．4％、24．1％、11．4％，抽穗期：18．5％、21．4％、16．0％，灌浆期：18．7％、14．6％、12．1％。在分蘖期进行SO2急性伤害处理，圣稻13和阳光200两个品种的平均减产量最大，分别为32．3％和29．3％，然而不论在哪个生育期进行熏气处理临稻10平均减产量相对稳定（18．4％和18．5％）。因此本研究表明SO2熏气处理对产量构成因子均有影响，总的规律是在水稻生长前期进行SO2熏气处理对产量主要构成因子的影响比生长后期进行SO2熏气处理的影响要大。

英文摘要：

In an open-top field exposure system for the controlled release of air pollutants, three genotypes of rice （Lin Dao10, Sheng Dao13 and Yang Guang200） were exposed to elevated SO2 concentrations in five growing seasons to study the effects of SO2 on rice yield components under field conditions. The treated plots were exposed to concentrations of C1 （ 13.09 mg·m^-3）,C2（26.18 mg·m^-3）, C3（39.26 mg·m^-3）, C4 （52.35 mg·m^-3）and the background concentration （CK） respectively. Compared with the normal growth rice, the difference of SO2 impacting on yield components depended on genotypes and growth stages of rice. Exposed to SO2, yield components of rice ear weight, thousand grain weight and grain number per ear reduced at tiller stage, and thousand grain weight reduced at heading stage according to the elevated SO2 concentrations. The difference of ear weight and thousand grain weight existed between rice exposed to SO2 and CK at jointing stage. The reduction of average yield of 18.5%,32.3% and 29.3% at tiller stage, 18.5% ,21.4% and 16.0% at jointingstage, 8.7%,14.6% and 12.1% at heading stage, 18.4%,24.1% and 11.4% at grain filling stage for Lin Dao10, Sheng Dao13 and Yang Guang200 respectively. The ratio of average yield reduction of Lin Dao10 near by 18% ,but the ratios of average yield reduction of Sheng Dao13 and Yang Guang200 were 32.3% and 29.3% respectively. This investigation showed that the effects of sulphur dioxide on the yield components of rice exposed to SO2 at early growth stages more than at later growth stages.