图1. 不同地力等级坡耕地土壤物理指标及农作物产量变化特征
不同大写字母表示同一垂直层次不同地力等级差异显著（P<0.05）

Fig. 1. Soil physical indicators and crop yield variation characteristics of sloping farmland with different productivity grade of cultivated land
Different capital letters represent significant differences in different soil fertility grades at the same vertical level (P<0.05)