信阳地区2003年光温条件对水稻产量的影响

通过对信阳地区1991—2004年的气象数据和水稻产量数据的分析，发现2003年水稻的减产是由于7—9月光温条件的剧烈变化所造成，产量相比近五年平均（2000—2004年）降低了28.28%。产量构成因子中结实率和每穗粒数所受影响最大，二者分别降低了23.71%和7.82%，而有效穗数与千粒重与其它年份相比并无显著差异。扬花至灌浆后期的光照不足对产量的影响最大，关联度达到0.7011。分蘖孕穗期的低温寡照、孕穗后期高温和扬花期低温也对产量有一定的影响。

Effect of Sunlight and Temperature on Rice Yield of Xinyang in 2003

Meteorologic data and rice yield data were analyzed in Xinyang from 1991 to 2004, and the reason of yield's decreasing was intense change of sunlight and temperature from July to September, and the rice yield was reduced by 28.28% compared with average of recent five years. Seed setting rate and spikelet number per panicle were the most serious ones affected by meteorologic conditions in all the yield components, which declined 23.71% and 7.82%, but there was not obvious difference for panicle number and grain weight compared with other years'. Yield was affected most strongly by the deficiency of sunlight from flowering stage to the evening of grain filling, and the correlative coefficient reached 0.7011. Rice yield also could be affected by the low temperature and sunlight in tillering stage, high temperature in the evening of booting stage, and low temperature in flowering stage.