紫色土坡耕地耕层质量障碍特征
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宋鸽,史东梅,曾小英,蒋光毅,江娜,叶青
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Quality Barrier Characteristics of Cultivated Layer for Sloping Farmland in Purple Hilly Region
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Ge SONG,DongMei SHI,XiaoYing ZENG,GuangYi JIANG,Na JIANG,Qing YE
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表3 不同地力等级坡耕地土壤属性指标障碍度特征
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Table 3 Characteristics of soil attribute index obstacles in sloping farmland with different productivity grade of cultivated land
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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 |
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