【摘要】 本项研究使用彭曼(Penman)公式估算了全省97个县(站)的玉米需水量并绘出玉米需水量等值线图。全省玉米需水量地理分布规律是从南向北逐渐升高,但在不同区域又存在不同的高值区,秦岭以南丹江流域一带和关中东部及陕北榆林风沙滩地为本省南部,中部和北部的三个相对高值区。全省多年平均夏玉米全生育期总需水量变化在260～490mm之间,春玉米全生育期总需水量变化在350～640mm之间;干旱年夏玉米变化在270～510mm之间,春玉米变化在370～680mm之间;湿润年夏玉米变化在250～470mm之间,春玉米变化在330～610mm之间。最后,对全省夏(春)玉米灌溉进行了分区评价。更多还原

【Abstract】 In this paper, Corn water requirements of 103 counties in shaanxi province have been calculateb by crop coefficient kc times refference crop evapotran spiration ostimated by modified penman formula accroding to meteorological faetors, and the isoline maps of corn evapotranspiration are charted in four typical years. The results show that the law of corn evapotranspirotion is the larger norehwestern part than in south western part. The total evapotranspiration of mang years average in summer corn growing seasons varies from 275 to 475mm, in spring corn growing seasons varies from 350 to 625mm. At last, the net irrigation water requirement of corn is estimated by water balance equation of field, and the isdine maps of corn irrigation watre raquiremont are charted in four typical years similar to corn evapotranspiration. Division of corn irrigation zone has been presented, and irrigation evaluations in various zones have been done.更多还原