河南省农业灌溉水分生产力区域分异研究

Agricultural Irrigation Water Productivity Difference Analysis in Henan Province

农业灌溉水分生产力是提高区域灌溉效率、发展节水农业和调整产业结构的重要依据,对水资源管理和决策也具有重要意义。在计算2011年河南省18个地级市的灌溉水分生产力、分析其区域分异特征的基础上,将河南省灌溉水分生产力分为高值区、中值区和低值区三个分级区,并确定了灌溉水分生产力区域分异的影响指标,利用灰色关联度法分别对不同分级区灌溉水分生产力的影响因素进行了定量评价。结果表明:灌溉水分生产力不仅受作物产量和灌溉水量的影响,同时还与作物有效降水量、农业机械总动力等因素密切相关。

In order to study the effect and laying thickness of polystyrene insulation board in the concrete-lined canal in Ningxia Yellow River irrigation area, the study selected Qinqu Canal from east to west and Liangtian Canal from north to south as two typical test sections and conducted the contrast tests of the influence of with insulation boards with different thickness and without insulation boards to the depth of freezing of channel. Through the channel cross-section analysis of the different parts of the measuring point deep frozen in situ observation data, by channel the shade （sunny） and canal bottom insulation board could create laying thickness and the shade （sunny） slope foot antifreeze lining structure, the thickness of the insulation board and channels of the relationship between frost, gave the different thickness of insulation board cut frozen depth values. The test results show that the polystyrene insulation board cut canal foundation soil frost effect is obvious, the suggestions about laying thickness of polystyrene insulation board, can be used as main canal in the irrigation area of Ningxia Yellow River anti-freeze expansion design reference.