紫色土坡耕地耕层质量障碍特征
宋鸽,史东梅,曾小英,蒋光毅,江娜,叶青

Quality Barrier Characteristics of Cultivated Layer for Sloping Farmland in Purple Hilly Region
Ge SONG,DongMei SHI,XiaoYing ZENG,GuangYi JIANG,Na JIANG,Qing YE
表3 不同地力等级坡耕地土壤属性指标障碍度特征
Table 3 Characteristics of soil attribute index obstacles in sloping farmland with different productivity grade of cultivated land
地力等级
Productivity grade
of cultivated land
土层
Soil layer
土壤属性指标障碍度 Barrier degree of soil property index (%)
土壤有机质
Soil organic matter
土壤全氮
Soil total nitrogen
土壤有效磷
Soil available phosphorus
阳离子交换量
Cation exchange capacity
土层厚度
Soil thickness
田面坡度
Field surface slope
一级
First
耕作层 Topsoil layer 22.32 16.42 23.10 9.41 19.16 0.19
心土层 Subsoil layer 29.41 19.21 21.11 15.69 14.15 0.43
底土层 Bottom soil 17.82 30.82 37.53 13.56 - 0.27
二级
Secondary
耕作层 Topsoil layer 24.71 18.22 22.26 8.87 14.86 2.22
心土层 Subsoil layer 31.66 17.54 20.75 14.96 9.48 5.61
底土层 Bottom soil 19.92 37.09 35.55 4.11 - 3.33
三级
Third
耕作层 Topsoil layer 18.69 12.28 18.59 13.05 17.24 7.10
心土层 Subsoil layer 24.18 14.52 17.21 16.79 12.48 14.81
底土层 Bottom soil 15.45 31.50 31.75 11.45 - 9.84
四级
Fourth
耕作层 Topsoil layer 20.09 17.71 18.26 11.00 12.20 9.74
心土层 Subsoil layer 20.28 14.85 13.69 12.91 17.51 20.77
底土层 Bottom soil 15.49 31.89 30.38 7.17 - 15.07
五级
Fifth
耕作层 Topsoil layer 18.21 14.56 15.26 10.59 15.33 15.46
心土层 Subsoil layer - - - - - -
底土层 Bottom soil 3.06 28.28 17.65 21.99 - 29.02