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