半干旱区有机质与全氮空间变异的尺度效应特征——以延安市为例
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王鹏, 赵君, 刘拓, 周一凡, 魏锦萍, 王磊
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Scale effects of spatial variations in SOM and STN in semi-arid regions: A case study of Yan'an
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WANG Peng, ZHAO Jun, LIU Tuo, ZHOU Yi-Fan, WEI Jin-Ping, WANG Lei
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表3 不同尺度有机质和全氮的半方差函数及分形维数
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Table 3 Semi-variogram and fractal dimension of SOM and STN at different scales
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项目 | 采样 距离/m | 拟合 模型 | C0 | C0+C | [C0/(C0+ C)]/% | 变程/m | 决定 系数R2 | 残差 RSS | 分形 维数FD | 有机质 | 0 | G | 0.0337 | 0.1114 | 30.25 | 45400 | 0.975 | 1.52×10-4 | 1.759 | 500 | G | 0.0338 | 0.1116 | 30.29 | 45000 | 0.977 | 1.18×10-3 | 1.758 | 1000 | G | 0.0321 | 0.1242 | 25.85 | 46900 | 0.981 | 1.49×10-4 | 1.730 | 1500 | G | 0.0301 | 0.1362 | 22.10 | 49400 | 0.985 | 1.49×10-4 | 1.705 | 2000 | G | 0.0277 | 0.1314 | 21.08 | 47500 | 0.986 | 1.42×10-4 | 1.690 | 2500 | G | 0.0271 | 0.1342 | 20.19 | 47700 | 0.987 | 1.32×10-4 | 1.676 | 3000 | G | 0.025 | 0.1250 | 20.00 | 47200 | 0.985 | 1.38×10-4 | 1.673 | 3500 | G | 0.026 | 0.1410 | 18.44 | 50300 | 0.991 | 9.64×10-5 | 1.669 | 4000 | G | 0.0218 | 0.1106 | 19.71 | 44400 | 0.988 | 9.80×10-5 | 1.649 | 4500 | G | 0.0236 | 0.1112 | 21.22 | 46000 | 0.992 | 6.39×10-5 | 1.677 | 5000 | G | 0.0254 | 0.1178 | 21.56 | 49900 | 0.989 | 8.25×10-5 | 1.660 | 全氮 | 0 | G | 0.0197 | 0.0698 | 28.22 | 46100 | 0.98 | 4.64×10-5 | 1.747 | 500 | G | 0.0196 | 0.0701 | 27.96 | 45800 | 0.982 | 4.44×10-5 | 1.744 | 1000 | G | 0.019 | 0.0767 | 24.77 | 46200 | 0.985 | 4.66×10-5 | 1.721 | 1500 | G | 0.0175 | 0.0825 | 21.21 | 48400 | 0.994 | 9.30×10-5 | 1.694 | 2000 | G | 0.0164 | 0.0800 | 20.50 | 45900 | 0.986 | 8.36×10-5 | 1.683 | 2500 | G | 0.0157 | 0.0832 | 18.87 | 47000 | 0.990 | 4.34×10-5 | 1.660 | 3000 | G | 0.0141 | 0.0775 | 18.19 | 47100 | 0.989 | 4.10×10-5 | 1.653 | 3500 | G | 0.0146 | 0.0877 | 16.65 | 48900 | 0.991 | 1.46×10-5 | 1.637 | 4000 | G | 0.0121 | 0.0726 | 16.67 | 44700 | 0.992 | 2.79×10-5 | 1.620 | 4500 | G | 0.0137 | 0.0738 | 18.56 | 47100 | 0.992 | 2.56×10-5 | 1.650 | 5000 | G | 0.0125 | 0.0768 | 16.28 | 50900 | 0.990 | 3.38×10-5 | 1.623 |
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