西南紫色土坡耕地农作物-耕层质量适宜性的耦合度诊断

娄义宝,史东梅,金慧芳,蒋光毅,段腾,江娜

Coupling Degree Diagnosis on Suitability Evaluation of Cultivated-Layer Quality for Slope Farmland in Purple Hilly Region of South-Western China

LOU YiBao,SHI DongMei,JIN HuiFang,JIANG GuangYi,DUAN Teng,JIANG Na

表5 3种坡耕地耕层类型的土壤质量变化特征

Table 5 Three types of sloping land plowing - the basic characteristics of crop system indicators

分类 Sort 统计值 Statistics 田面坡度Slope (°) 有效土层 厚度Effective thickness of soil layer (cm) 耕层 厚度Topsoil thickness (cm) pH 有机质 Soil organic matter (g·kg-1) 阳离子 交换量Cation exchange Capacity (cmol(+)·L-1) 全氮 Total nitrogen (g·kg-1) 有效磷 Effective phosphate (mg·kg-1) 速效钾 Available potassium (mg·kg-1) 作物产量 Crop yield (t·hm-2) I类 Class I 均值 Average value 12 33 20 6.4 13.89 21.0 0.95 10.07 62.1 6.640 标准差 Standard deviation 6.7 9.84 2.73 1.07 4.24 6.79 0.27 10.39 17.69 1.83 变异系数Coefficient of variation (%) 57.7 29.86 13.65 16.77 30.53 32.35 28.42 103.18 28.47 27.56 II类 Class II 均值 Average value 11 38 22 7.3 12.45 20.4 0.90 8.40 136.5 7.140 标准差 Standard deviation 4.8 9.83 2.35 0.80 5.22 5.69 0.37 9.29 24.42 1.87 变异系数Coefficient of variation (%) 42.4 25.65 10.93 11.03 41.93 27.86 41.11 110.60 17.89 26.19 III类 Class III 均值 Average value 18 28 20 4.8 17.80 9.2 1.04 121.50 58.6 4.690 标准差 Standard deviation 10.6 10.61 0.00 0.57 1.27 12.88 0.09 24.75 23.19 0.80 变异系数Coefficient of variation (%) 60.6 38.58 0.00 11.88 7.13 140.15 8.65 20.37 39.57 17.06 适宜性特征值[17,21] Suitability eigenvalue — 40-60 20-25 — 8.99-22.8 21.1-32.1 0.66-1.02 6.3-18 — —