贵州省1990年夏秋连旱对秋粮的影响及对策研究

INFLUENCE OF SUCCESSIVE DROUGHT IN SUMMER AND AUTUMN TO AUTUMN GRAIN AND THE WAY TO DEAL WITH IT IN GUIZHOU 1990

本文分析了贵州1990年水稻、玉米旱期累计雨量、旱期最长无大雨日,受旱始期及其二次项与相对气候产量(Yw)的关系,得出结论:旱期最长无大雨日二次项对水稻、玉米的Yw有极显著的负效应。旱期累计雨量对水稻的Yw产生正效应,旱期累计雨量二次项对玉米的Yw产生显著的正效应。水稻、玉米在抽穗(抽雄)至乳熟期出现严重干旱,将大幅度减产。在乳熟期受轻旱,秋食反而会略有增产。

The relation between relative weather yield (Yw) and the longest days of no heavy rain (LDR25mm), accumulation precipitation (AP) , the beginning day of drought and their quadratic on the rice and maize was analysed in Guizhou 1990. The LDR25's quadratic has an excessive negative effect to Yw of rice and maize. AP has a positive effect to Yw of maize. The crop yield decreased deadly when the dry duration occurred from beading or silking to grain filling stage, but the slight drought improved the yield in the grain filling stage.