田阳干旱指数对早玉米产量影响的农业气候评价

Agroclimatic assessment of drought index affecting corn yield in Tianyang

利用田阳1987年至2012年早玉米产量与其生育前期易旱的3月上旬至5月中旬的旬干旱指数,釆用数理相关统计法,计算旬干旱指数与早玉米产量的相关系数及多元回归方程模式的建立,评价干旱指数对早玉米生产利蔽的影响。结果表明:干旱主要影响早玉米生理需水敏感的抽雄吐丝期,俗称"卡脖子旱",其次干旱影响早玉米播种后全苗齐苗。这对充分开发利用当地农业气候资源,科学规避干旱的影响,趋利避害,夺取早玉米高产稳产意义重大。

Based on Tian Yang corn yield and its drought index, which is from early ten-days in March to mid ten-day in May, from 1987 to 2012, coefficient of correlation between drought index and early maize yield was calculated and multiple regression equation model was established by the mathematical related statistics methods to evaluate the influence of drought index on early maize production. The results showed that drought mainly affected spinning tasseling stage of maize; the second influence was on seedling emergence after sowing. The results are of great significance in full development and utilization of local agricultural climate resources and avoiding the influence of the drought.