1968-2018年辽河流域生长季潜散量变化及主控气象因素
王亚蕾1, 董 晔2

(1.新疆师范大学 地理科学与旅游学院, 乌鲁木齐 830054; 2.新疆师范大学 商学院, 乌鲁木齐 830054)

参考作物蒸散量; 主导因子; 辽河流域

Spatiotemporal Distribution of Potential Evapotranspiration and Its Main Meteorological Factors in Liaohe River Basin During Growing Season from 1968 to 2018
WANG Yalei1, DONG Ye2

(1.School of Geography and Tourism, Xinjiang Normal University, Urumqi 830054, China; 2.Business School, Xinjiang Normal University, Urumqi 830054, China)

reference crop evapotranspiration; dominant factor; Liaohe River Basin

备注

为了探析辽河流域潜散量变化及主控气象因素,为促进该流域农业水资源合理利用和农业生产规划提供参考,基于辽河流域内23个气象站点1968—2018年生长季逐日气象数据,利用Penman-Monteith公式计算了辽河流域参考作物蒸散量,采用线性趋势分析、逐步回归分析、克里金空间插值分析和通径分析研究了辽河流域参考作物蒸散量的时空变化特征及主控气象因素。结果表明:(1)辽河流域1968—2018年生长季参考作物蒸散量整体呈下降趋势,下降速率为-0.303 mm/a,5月、6月、7月ET0呈下降趋势,8月、9月ET0呈上升趋势;(2)辽河流域生长季参考作物蒸散量在空间分布上呈中间高、四周低、西部高于东部的分布特征,各月ET0空间分布特征与整体分布特征相近;(3)各气象因子对辽河流域生长季参考作物蒸散量的影响程度从高至低依次为日照时数、相对湿度、风速、最低气温和最高气温,主控气象因素是日照时数。总体而言,辽河流域生长季潜散量在1968—2018年间呈下降趋势,日照时数是该区域潜散量变化的主导因子。
In order to analyze the change of potential evapotranspiration and the main meteorological factors in the Liaohe River Basin, and provide references for promoting the rational use of agricultural water resources and agricultural production planning in the basin, based on the daily meteorological data of the 23 meteorological stations in the Liaohe River Basin from 1968 to 2018, we used Penman-Monteith formula to calculate the reference crop evapotranspiration in the Liaohe River Basin, used linear trend analysis, stepwise regression analysis, Kriging spatial interpolation analysis and path analysis to study the temporal and spatial characteristics of reference crop evapotranspiration and the main meteorological factors in the Liaohe River Basin. The results showed that:(1)the reference crop evapotranspiration in the growing season from 1968 to 2018 in the Liaohe River Basin showed a downward trend, at a rate of -0.303 mm/a; ET0 showed a downward trend in May, June and July, and the increased trends in August and September;(2)the spatial distribution of the reference crop evapotranspiration of growing season in the Liaohe River Basin was high in the middle, low in the surroundings, and higher in the west than in the east; the monthly ET0 spatial distribution was similar to the overall distribution;(3)the degree of influence of various meteorological factors on the reference crop evapotranspiration in the growing season in the Liaohe River Basin decreased in the order: sunshine duration>relative humidity>wind speed>minimum temperature > maximum temperature, and the main meteorological factor was sunshine duration. In general, the latent dispersion in the growing season of the Liaohe River Basin showed a downward trend from 1968 to 2018, and the sunshine duration was the dominant factor in the variation of the latent dispersion in this region.