辽宁省玉米水分生产率时空变化规律及影响因素

Spatiotemporal variation in water productivity of corn and its influencing factors in Liaoning Province

基于2005-2017年辽宁省14个地级市玉米种植数据、灌溉用水量及气象数据等资料,运用线性倾向估计及全局空间自相关分析等方法,从不同地区、不同降水年型(枯、平、丰)角度出发,分析不同玉米水分生产率指标的时空变化规律及其影响因素,结果表明:在时间尺度上,全省玉米灌溉水分生产率多年平均值为1.63kg/m3,玉米水分生产率总体每10a以0.04kg/m3的速率波动上升;在空间尺度上,全省玉米灌溉水分生产率均值呈现出西北高、东南低的空间分异,玉米水分生产率在枯水年(2006)和平水年(2007)总体均表现为东北高、西南低,而丰水年(2012)则表现为西北高、东南低;玉米单产量是影响各水分生产率指标最显著的因素。该研究成果可为提高辽宁省农业用水效率、缓解水资源压力提供一定参考。

The spatiotemporal variation and influencing factors of different corn water productivity index are analyzed based on the corn planting,irrigation water consumption data and meteorological data of the 14 cities of Liaoning Province from 2005 to 2017 using linear tendency estimate and global spatial autocorrelation analysis method under different rainfall year type(dry,flat,wet)perspective.The results show that:On the time scale,the entire province perennial average corn irrigation water productivity is 1.63 kg/m^3,and the overall corn water productivity fluctuated at a rate of 0.04 kg/m^3 per 10 years.On the spatial scale,the annual corn irrigation water productivity of the whole province is high in the northwest and low in the southeast.In the dry year(2006)and flat year(2007),corn water productivity was high in the northeast and low in the southwest,while in the wet year(2012),it was high in the northwest and low in the southeast,respectively.Single corn yield is the most significant factor that affected the water productivity indices.The research results can provide some references for improving agricultural water use efficiency and relieving water resource pressure in Liaoning Province.