腾格里沙漠土壤水分含量与地形、植被的关系
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宁婷, 张定海, 赵有益, 江晶
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Relationship between soil moisture and topography and vegetation in the Tengger Desert
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Ting Ning, Dinghai Zhang, Youyi Zhao, Jing Jiang
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表2 基于广义加性模型的变量的显著性检验
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Table 2 Significance test for variables based on generalized additive models
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| 变量 | 0~40?cm | 40~200?cm | 200~300?cm |
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| edf | | edf | | edf | |
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| 坡度 | 3.314 | 0.244 | 3.381 | 0.250 | 3.480 | 0.025 | | 坡向 | 1.000 | 0.580 | 1.359 | 0.866 | 2.537 | 0.000 | | 高差 | 1.000 | 0.197 | 1.000 | 0.006 | 1.448 | 0.000 | | 灌木盖度 | 1.000 | 0.370 | 1.000 | 0.156 | 2.976 | 0.262 | | 灌木多度 | 2.644 | 0.025 | 1.932 | 0.115 | 1.906 | 0.118 | | 草本盖度 | 1.000 | 0.003 | 1.000 | 0.003 | 1.000 | 0.453 | | 草本多度 | 1.241 | 0.052 | 1.000 | 0.224 | 1.778 | 0.301 | | 凋落物 | 1.731 | 0.042 | 1.000 | 0.642 | 1.000 | 0.533 | | 生物量 | 2.216 | 0.029 | 1.959 | 0.248 | 1.000 | 0.531 |
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