基于GWR模型的渭北黄土旱塬粮食单产空间分异 及其影响因子分析——以陕西彬县为例

邱孟龙,曹小曙,周建,冯小龙,高兴川

Spatial Differentiation and Impact Factors of Grain Yield Per Hectare in Weibei Plateau Based on GWR Model: A Case Study of Binxian County, Shannxi

QIU MengLong,CAO XiaoShu,ZHOU Jian,FENG XiaoLong,GAO XingChuan

表2 GWR模型回归参数统计

Table 2 Statistics of regression parameters of GWR model

参数 Parameters 平均值 Mean 最小值 Minimum 最大值 Maximum 上四分位值 Upper quartile 下四分位值 Lower quartile 中位数 Median 相对极差 Relative ranges 常数项 Intercept 297.57 246.90 329.88 286.52 314.55 299.85 0.28 坡度 Slope 5.18 -45.30 27.81 -9.53 22.16 11.83 14.11 耕层厚度 Plough layer thickness 42.30 33.35 66.25 37.63 45.30 42.05 0.78 土壤类型 Soil type -35.94 -100.74 6.57 -51.11 -20.31 -33.44 2.99 侵蚀程度 Erosion degree -24.85 -46.13 7.77 -38.97 -13.68 -25.11 2.17 土壤有机质 Soil organic matter 225.50 172.00 311.23 189.92 254.17 220.21 0.62 地下水埋深 Groundwater depth -82.94 -116.71 -60.55 -98.08 -69.51 -79.40 0.68 道路密度 Road density 28.28 -18.36 70.14 11.46 48.93 25.63 3.13 施肥成本 Cost of fertilization 168.07 93.21 185.42 162.60 178.68 175.91 0.55 粮食单产实测值 Crop yield per unit (kg·hm-2) 3257.88 1775.00 4950.00 2653.12 3893.75 3198.75 0.97 粮食单产预测值 Estimating crop yield per unit (kg·hm-2) 3254.35 1888.21 5139.93 2773.27 3680.76 3246.47 1.00 条件数 Cond 22.10 19.64 29.73 20.74 23.02 21.78 0.46 Local R2 0.81 0.73 0.89 0.78 0.83 0.81 0.20 残差 Residual 3.53 -769.77 576.19 -172.61 160.68 19.67 381.29