基于作物水分亏缺指数的宁夏酿酒葡萄干旱时空差异分析

Spatiotemporal difference analysis of drought on wine grape in Ningxia based on crop water deficit index

作物水分亏缺指数是衡量旱情的重要指标之一,对其进行时空差异分析是科学有效地应对旱灾的重要手段。根据宁夏回族自治区24个站点30年的气象资料,采用逐旬作物系数法,以FAO Penman-Monteith模型为基础计算作物需水量,再结合有效降雨量,对宁夏酿酒葡萄的水分亏缺指数进行了时空差异分析。同时,也就干旱发生频率做了初步探讨。结果表明,宁夏酿酒葡萄作物水分亏缺指数在葡萄生育期内呈现"升高—降低—升高"的总体变化趋势,最大值出现在6月上旬。在整个生育期内,区内旱情严重程度均呈现由南向北递增的趋势。

Crop water deficit index( CWDI) is one of the important indicators in measuring drought severity.Analyzing the spatiotemporal variation of CWDI is an important means to cope with drought scientifically and effectively. Based on the weather data from 24 meteorological stations in Hui Ningxia Autonomous Region during 30 years,this study calculated the water requirement of wine grape by FAO Penman-Monteith model and decade drop coefficient method,and combining with effective rainfall,analyzed the spatiotemporal variation of CWDI of wine grape in Ningxia Hai Autonomous Region,and preliminary explored the drought frequency as well. Results show that,the CWDI of wine grape in Ningxia Hui Autonomous Region first presents an overall rising tendency,then drops and then rises again. The maximum value of CWDI appears in the first ten days of June.