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中文摘要：
针对压砂地西瓜水资源高效利用和合理灌溉制度问题,于2008年和2009年采用试坑对比试验方法进行了研究,利用水分生产函数Jensen模型分析了压砂地西瓜耗水规律及需水关键期,并用Jensen模型对压砂地西瓜灌溉制度进行了优化,结果表明：（1）压砂地西瓜全生育期耗水量为79.6-409.9 mm;（2）西瓜需水关键生育阶段顺序为＂苗期〉开花坐果期〉膨大初期〉膨大中期〉伸蔓期〉膨大后期＂;（3）压砂地西瓜各生育阶段的水分敏感系数λ1=0.6171,λ2=0.2707,λ3=0.0355,λ4=0.1097,λ5=0.1390,λ6=0.1106;（4）通过灌溉制度优化发现：供水量范围为80-240 mm时增产效果最明显,供水量达到320 mm时,压砂地西瓜可获得高产。最优灌溉制度为：苗期灌水20-30 mm,伸蔓期灌水50-55 mm,开花坐果期灌水40-45 mm,膨大初期灌水70 mm,膨大中期灌水60-70mm,膨大末期灌水60-65 mm。
英文摘要：
The paper aimed at the problem of rational irrigation schedules and high efficiency utilization of water resources for watermelon in gravel mulch field,adopted the test pits contrast method in 2008 and 2009,using the water production function as Jensen model,analyzed the water consumption rule,key water requirement period and optimized the irrigation schedules by using Jensen model for watermelon in gravel mulch field.The results showed that：（1）The water consumtion in whole growth period of watermelon in gravel mulch field was 79.6 to 409.9 mm.（2）The order of key water demand period for watermelon was seedling stageflowering and fruit setting stageexpand initial stageexpand middle stagestretch tendril stageexpand late stage.（3）The water sensitive index for each growth stage were：λ1=0.6171,λ2=0.2707,λ3=0.0355,λ4=0.1097,λ5=0.1390 and λ6=0.1106.（4）Through the optimal irrigation schedule found：the yield increasing effect was the most obvious when the irrigation supply was 80 to 240 mm;The high yield can be obtained when the irrigation supply reached 320 mm.The optimal irrigation schedule were：20 to 30 mm in seedling stage,50 to 55 mm in vine-extending stage,40 to 45 mm in flowering and fruit setting stage,70 mm in expand initial stage,60 to 70 mm in expand interim stage,60 to 65 mm in expand late stage.
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