土壤肥力及其影响因素的尺度效应——以北京市平谷区为例

葛畅, 刘慧琳, 聂超甲, 沈强, 张世文

Scale effect of soil fertility spatial variability and its influencing factors

Chang GE, Huilin LIU, ChaoJia NIE, Qiang SHEN, Shiwen ZHANG

表4 各尺度下肥力指标及IFI统计特征

Table 4 Descriptive statistics of soil fertility indicators and soil fertility index (IFI) at the large, medium, and small scales

尺度 指标 最小值 最大值 均值 标准差 偏度 峰度 变异系数/% L pH 4.39 8.32 7.24 0.73 -1.11 1.16 0.10 CEC/(cmol/kg) 8.00 37.73 16.53 2.99 0.87 4.80 0.18 SOM/(g/kg) 4.87 70.34 20.60 8.31 1.81 5.68 0.40 TN/(g/kg) 0.36 6.29 1.40 0.61 3.24 18.33 0.43 AK/(mg/kg) 38.00 939.50 215.56 138.63 1.88 4.02 0.64 AP/(mg/kg) 0.56 820.60 127.57 159.17 1.99 3.85 1.25 AB/(mg/kg) 0.14 1.29 0.41 0.17 1.82 4.66 0.41 AFe/(mg/kg) 5.61 173.00 32.91 27.45 2.18 5.64 0.83 AZn/(mg/kg) 0.21 38.80 4.88 5.25 2.97 11.76 1.08 IFI 0.20 0.87 0.61 0.12 -0.63 0.28 0.20 M pH 4.48 8.08 6.85 0.77 -0.94 0.53 0.11 CEC/(cmol/kg) 8.61 23.43 16.77 2.41 -0.16 0.46 0.14 SOM/(g/kg) 7.27 69.53 21.88 7.86 1.65 7.04 0.36 TN/(g/kg) 0.51 6.29 1.63 0.89 3.23 12.60 0.54 AK/(mg/kg) 63.70 903.50 259.23 155.58 1.73 3.38 0.60 AP/(mg/kg) 1.49 820.60 211.15 189.52 1.09 0.60 0.90 AB/(mg/kg) 0.19 1.27 0.39 0.14 2.51 10.52 0.37 AFe/(mg/kg) 5.61 172.80 43.44 36.08 1.54 1.96 0.83 AZn/(mg/kg) 0.51 36.11 5.65 5.07 2.60 10.64 0.90 IFI 0.20 0.88 0.61 0.12 -0.72 1.22 0.19 S pH 4.48 8.13 6.86 0.69 -0.70 0.47 0.10 CEC/(cmol/kg) 8.09 26.43 16.56 2.50 -0.15 0.61 0.15 SOM/(g/kg) 5.95 69.53 21.50 7.42 1.19 4.00 0.35 TN/(g/kg) 0.51 6.29 1.59 0.84 3.14 12.23 0.53 AK/(mg/kg) 63.60 903.50 254.18 151.99 1.59 2.60 0.60 AP/(mg/kg) 0.41 824.20 202.34 183.39 1.11 0.70 0.91 AB/(mg/kg) 0.07 1.27 0.39 0.15 1.97 6.16 0.40 AFe/(mg/kg) 5.23 178.20 41.99 33.39 1.71 3.04 0.80 AZn/(mg/kg) 0.39 37.76 5.61 5.13 2.64 10.64 0.91 IFI 0.20 0.88 0.61 0.11 -0.67 1.26 0.17