基于投影寻踪分类模型的暗管优化布局

Optimization of Layout Scheme of Subsurface Drainage Tubes Based on Projection Pursuit

为寻求综合效益最优的设施农田暗管布局方案,设计不同埋深与间距的暗管处理,探索不同处理对番茄(Lycopersicon esculentum Mill.)产量、品质、土壤盐分和有机质含量的影响,分析暗管工程的经济效益,并引入熵权系数法和投影寻踪分类模型,对不同暗管处理进行优选和评价。结果表明,不同暗管处理对番茄产量和品质有显著影响,其中T2处理番茄产量品质综合水平最优;土壤EC与有机质含量以T1处理下降最为明显,降幅分别达到35.66%和18.08%;投影寻踪分类模型计算结果表明,T3为综合效益最佳的处理,投影值(y)与暗管间距(x1)、埋深(x2)的回归模型为y=-2.203x1+0.340x2+0.831,相关系数为0.810,说明在本试验的设计范围内,综合效益(投影值)与暗管间距呈负相关,与暗管埋深呈正相关。

To find out the best layout scheme of subsurface drainage tubes with best comprehensive benefits, different treatments with space and depth of tubes were designed, the effects of different treatments on tomato quality, yield, soil EC and organic matter were explored, and the cost of drainage system was analyzed, meanwhile, the entropy weight method and projection pursuit model were used to evaluate the drainage treatments. Results showed that： different treatments had significant effects on tomato quality and yield, T2 was the optimal treatment with best comprehensive effects of quality and yield; soil EC and organic matter were decreased most significantly in T1, decreasing rate of which reached 35.66%和18.08%; The calculation results of projection pursuit model showed that T3 was the treatment with best comprehensive benefits, projection value （y） and drainage space （x-） and depth （x2） showed a relationship of y=-2.203x1＋0.340x2＋0.831, correlation coefficient was 0.810, indicating that in the scope of this experimental design, comprehensive benefits （projection pursuit） presented negative relationship with space, but positive relationship with depth.