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4 不同地力等级坡耕地耕层土壤特性与产量基本特征

Table 4 Analysis of physical and chemical properties and yield of cultivated tillage on different slope farmland

地力等级 Productivity grade of cultivated land 土层深度 Soil depth (cm) 有机质 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) pH 田面坡度Slope (°) 有效土层 厚度Effective thickness of soil layer (cm) 作物产量 Crop yield (t·hm-2) 一 First 耕作层 Tillage layer 0-20 15.38 24.2 1.01 12.40 70.3 6.4 5 38 8.860 心土层 Heart layer 20-38 9.59 22.4 0.75 5.13 54.5 7.0 底土层Subsoil >38 7.85 16.6 0.97 3.60 56.5 7.4 二 Secondary 耕作层 Tillage layer 0-21 12.47 21.6 0.93 10.29 100.7 6.8 7 43 7.500 心土层 Heart layer 21-43 9.14 21.2 0.72 10.29 80.5 7.2 底土层Subsoil >43 6.24 21.6 0.56 4.45 71.8 7.4 三 Third 耕作层 Tillage layer 0-21 14.60 17.8 1.06 27.73 77.3 6.5 11 38 6.440 心土层 Heart layer 21-38 8.85 15.5 0.70 3.99 67.9 6.8 底土层Subsoil >38 7.59 16.0 0.67 4.00 72.9 6.6 四 Fourth 耕作层 Tillage layer 0-21 12.81 20.0 0.79 9.47 56.2 6.0 15 29 5.400 心土层 Heart layer 21-37 11.00 15.1 0.68 7.07 48.6 5.7 底土层Subsoil >37 7.79 16.5 0.55 3.35 53.4 5.4 五 Fifth 耕作层 Tillage layer 0-19 14.04 16.8 0.93 25.92 79.3 6.6 22 21 4.860 心土层 Heart layer — — — — — — — 底土层Subsoil >19 15.10 7.6 0.91 62.10 68.6 5.9