| 组分 | 初始特征值 | 主成分分析提取结果 | ||||
| 特征根 | 贡献率 | 累计百分比 | 特征根 | 贡献率 | 累计百分比 | |
| 覆土厚度 | 3.243 | 36.038 | 36.038 | 3.243 | 36.038 | 36.038 |
| 全氮 | 1.554 | 17.266 | 53.305 | 1.554 | 17.266 | 53.305 |
| 有机质 | 1.337 | 14.858 | 68.163 | 1.337 | 14.858 | 68.163 |
| pH | 1.081 | 12.011 | 80.174 | 1.081 | 12.011 | 80.174 |
| 电导率 | 0.693 | 7.705 | 87.879 |
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| 有效磷 | 0.454 | 5.043 | 92.921 |
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| 速效钾 | 0.389 | 4.323 | 97.244 |
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| 铵态氮 | 0.193 | 2.146 | 99.390 |
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| 硝态氮 | 0.055 | 0.610 | 100.000 |
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