Journal of Natural Resources, Volume. 35, Issue 3, 743(2020)
Spatial variability of soil nutrients and its affecting factors at small watershed in gully region of the Loess Plateau
Figures & Tables(8)
Fig. 1. Distribution of sample points, altitude, and land use types in the study area
Fig. 2. Spatial distribution of soil nutrients in the gully region of the Loess Plateau
Fig. 3. Distribution characteristics of soil nutrients in different land use types
Table 1. Descriptive statistical characteristics of soil nutrients
View tableView in ArticleTable 1. Descriptive statistical characteristics of soil nutrients
土壤
养分最大值/
(g·kg-1)最小值/
(g·kg-1)均值/
(g·kg-1)标准差 变异
系数/%正态分布
转换方法有机质 39.99 7.82 17.06 6.77 39.70 Box-Cox 全氮 2.11 0.52 1.02 0.35 34.73 Box-Cox 全磷 1.35 0.51 0.77 0.15 20.17 N 全钾 33.83 15.73 19.60 2.70 13.80 Box-Cox
Table 2. Semi-variance theoretical model parameters, global Moran's I index and fractal dimension of soil nutrients
View tableView in ArticleTable 2. Semi-variance theoretical model parameters, global Moran's I index and fractal dimension of soil nutrients
土壤养分 理论模型 块金值 基台值 块基比/% 变程/m R 2分形维数 全局Moran's I Z 有机质 Spherical 0.106 0.389 27.27 388 0.613 1.873 0.222** 2.904 全氮 Spherical 0.021 0.077 27.73 370 0.654 1.882 0.236** 3.076 全磷 Exponential 0.009 0.025 37.22 1941 0.763 1.826 0.324** 4.106 全钾 Exponential 0.001 0.010 12.50 1062 0.876 1.811 0.278** 3.579
Table 3. Bivariate Moran's I index between soil nutrients and environmental factors
View tableView in ArticleTable 3. Bivariate Moran's I index between soil nutrients and environmental factors
土壤养分 高程 坡度 坡向 平面曲率 剖面曲率 黏粒 砂粒 植被指数 距居民点距离 有机质 -0.095 -0.122* 0.007 -0.210* -0.154* 0.062 -0.036 0.166* -0.061 全氮 -0.088 -0.130* 0.049 -0.239* -0.204* 0.088 -0.049 0.180* -0.078 全磷 0.448** -0.359** -0.092 -0.101 -0.116 -0.164* 0.188* 0.160* 0.356** 全钾 0.009 0.049 0.291* -0.089 0.033 0.184* -0.093 0.151* 0.052
Table 4. Distribution characteristics of soil nutrients in different topographical zones (g·kg-1)
View tableView in ArticleTable 4. Distribution characteristics of soil nutrients in different topographical zones (g·kg-1)
有机质 全氮 全磷 全钾 高程/m ≤1000 10.95±0.33 0.67±0.01 0.70±0.01 18.32±0.44 1000~1100 15.64±3.68 0.94±0.20 0.69±0.04 18.90±1.12 1100~1200 16.76±3.41 1.01±0.18 0.74±0.07 19.55±1.49 >1200 15.25±1.25 0.93±0.07 0.86±0.08 19.65±1.55 坡度/(°) ≤2 15.29±1.18 0.93±0.06 0.87±0.08 19.63±1.53 2~6 15.14±2.21 0.94±0.13 0.80±0.07 19.25±1.57 6~15 15.80±3.22 0.96±0.18 0.73±0.07 19.65±1.48 15~25 16.38±3.51 0.99±0.19 0.73±0.07 19.34±1.40 >25 15.81±3.93 1.00±0.20 0.71±0.07 19.00±1.16 坡向 阴坡 15.32±2.24 0.92±0.12 0.84±0.09 18.39±0.97 半阳坡 15.53±2.40 0.93±0.11 0.82±0.09 19.25±1.44 阳坡 15.59±2.27 0.96±0.13 0.81±0.11 19.93±1.54 半阴坡 15.67±2.62 1.02±0.17 0.82±0.14 19.85±1.12
Table 5. Test of regression algorithm and choice of forecast model in soil nutrients
View tableView in ArticleTable 5. Test of regression algorithm and choice of forecast model in soil nutrients
土壤
养分滞后型
拉格朗日算子误差型
拉格朗日算子稳健型滞后
拉格朗日算子稳健型误差
拉格朗日算子模型
选择有机质 7.53(0.006) 9.79(0.002) 1.61(0.205) 3.87(0.038) SEM 全氮 5.91(0.015) 8.09(0.004) 1.29(0.256) 3.47(0.042) SEM 全磷 2.36(0.124) 1.42(0.234) 1.43(0.232) 0.48(0.489) OLS 全钾 1.49(0.222) 0.99(0.319) 0.77(0.379) 0.27(0.602) OLS
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Jing-han YANG, Meng-yun LIU, Jie ZHANG, Meng-meng ZHANG, Run-shan CAO, Xin-yue CAO. Spatial variability of soil nutrients and its affecting factors at small watershed in gully region of the Loess Plateau[J]. Journal of Natural Resources, 2020, 35(3): 743
Paper Information
Received: Jan. 24, 2019
Accepted: --
Published Online: Sep. 25, 2020
The Author Email: LIU Meng-yun (lmy471993@163.com)
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