基于熵权系数评价模型的烟田灌排工程综合效益分析

针对烟区土壤连作障碍、病虫害、灌溉设施落后等问题,设计不同的灌排处理,对不同处理烤烟增产效益、提质效益和灌排工程的经济效益进行分析,同时引入熵权系数评价模型,对不同灌排工程方案进行优选和评价。结果表明:不同灌排工程均具备较好的增产效益和提质效益(W1除外),微喷灌工程的增产和提质效益总体要优于低压管道;W2~W5灌排工程均具备了经济可行性,不同工程方案以W5经济效益最优,EIRR、ENPV和EBCR值分别达到27.80%、2 894.35%和2.04;本试验中综合效益最佳的灌排方案为微喷灌灌溉结合暗管排水,其中暗管间距为6m,埋深0.8m。

Comprehensive Benefit Analysis of Flue-cured Tobacco Fields Irrigation and Drainage Project Based on Entropy Weight Coefficient Evaluation Model

In this paper ,aiming at the problems of continuous cropping ,plant diseases ,and lagging irrigation and drainage facilities , different irrigation and drainage treatments are designed ,and the yield increasing ,quality improving and economic benefits of irriga-tion and drainage projects are analyzed .Moreover ,the entropy weight coefficient evaluation model is introduced to evaluate and select the best scheme .The results show that :the irrigation and drainage projects all obtain satisfactory yield increasing and quality impro-ving benefits (except W1 treatment ) ,the yield increasing and quality improving benefits of micro-spay is better than that of low pres-sure pipeline;W2~W5 treatment all obtain great economic feasibility ;the economic benefit of W5 is the best ,with the EIRR、EN-PV and EBCR of 27 .80% ,2 894 .35% and 2 .04 ,respectively .In this study ,the best scheme with optimal overall benefits is the mi-cro-spray irrigation combined with subsurface drainage ,and the space and depth of drainage pipes are 6 m and 0 .8 m ,respectively .