基于Penman-Monteith的浙江省杂交晚稻甬优17需水量空间变异性

Spatial Variability of Water Requirement of Hybrid Late Rice Yongyou 17 in Zhejiang Province Based on Penman-Monteith

采用地统计与GIS相结合的方法,研究了浙江省杂交晚稻甬优17各生育期需水量的空间变异性,结果表明:浙江省杂交晚稻甬优17各生长阶段需水量为22.40~82.79 mm,以成熟收获期水稻需水量的变异系数最大,以拔节孕穗期的变异系数最小。杂交晚稻甬优17各生育期需水量的C0/(C0+C)值在0.20~0.50。其中分蘖期需水量的C0/(C0+C)值最少,为0.2,播种育苗期需水量的C0/(C0+C)值最大,为0.5。各生育期需水量的变程在84600~2229900 m之间,以拔节孕穗期需水量的变程最小,以播种育苗期需水量的变程最大。浙江省杂交晚稻甬优17大田生长期水稻需水量大于323.50mm的高值区位于浙江省的西南部、中部和北部的一部分地区,占研究区总面积的31.29%,大部分地区的水稻需水量为270.83~323.49 mm,占研究区总面积的66.43%。

The spatial variability of water requirement of late hybrid rice Yongyou 17 in Zhejiang Province was stud-ied by geostatistics and GIS in this study.The results showed that the water requirement of Yongyou 17 was 22.40~82.79 mm in different growth stages,and the variation coefficient of water requirement at mature harvest stage wasthe largest,and that at jointing and booting stage was the smallest.The C0/(C0+C)value of water requirement in dif-ferent growth stages of hybrid late rice Yongyou 17 ranged from 0.20 to 0.50.The value of C0/(C0+C)of water require-ment at tillering stage was the least,which was 0.2,and the value of C0/(C0+C)in sowing and seedling stage was thehighest,which was 0.5.The range of water requirement in different growth stages ranged from 84600 m to 2229900 m.the water requirement at jointing and booting stage was the smallest,and that of sowing and seedling stage wasthe largest.The high value area of rice water requirement greater than 323.50 mm is located in the southwest,cen-tral and northern parts of Zhejiang Province,accounting for 31.29% of the total area of the study area.The water re-quirement of rice in most areas is 270.83~323.49 mm,accounting for 66.43% of the total area of the study area.