石羊河下游民勤盆地土壤盐分空间分异特征

doi:10.13866/j.azr.2023.10.08

Abstract

Abstract:

Clarifying the spatial variability of soil salinity is the aim of soil salinization research and saline-alkali land improvements. In this study, the Minqin Basin in the lower reaches of the Shiyang River in the arid inland river basin was selected as the study area. By analyzing the statistical characteristics, spatial autocorrelation, variability, and distribution patterns of soil salinity in situ data of the 0-30 cm soil layer, the changes in the spatial heterogeneity of soil salinity could be explored to provide a theoretical basis for soil salinity in the study area. The measured soil salinity content and its variation range both decreased as the soil layer increased, and both were in a skewed normal distribution. Moran’s I index showed a “∽” type fluctuation trend, and the range of values increased with the soil layer, and the positive (negative) spatial autocorrelation decreased as the distance increased (negative spatial autocorrelation of 0-10 cm was opposite). The exponential model was the most suitable for use with the variogram. The R² increased with soil depth (0.62→0.69→0.81), and the RSS was 0.0002. Variation rules of C₀/(C₀+C) and A₀ were consistent, and the spatial heterogeneity ranged from weak to strong to moderate with soil depth. Accuracy of the interpolation was 10-20 cm > 20-30 cm > 0-10 cm. The soil salinity of the three layers had spatial differentiation characteristics, and the degree of salinization increased gradually from southwest to northeast in the horizontal direction (the same soil layer). In the vertical direction (different soil layers), the distribution patterns changed from simple to complex, and gradually tended to patches (10-20 cm) and spots (20-30 cm) from the aggregation state (0-10 cm). Nonsalinized soil (<1.50%) and four different levels of saline soil were distributed in the three soil layers, and the area of saline soil was moderate (>70.00%) > strength (approximately 20.00%) > mild (approximately 9.00%) > saline soil (<0.50 %).

Key words: soil salinity, spatial variation, geostatistics, Minqin Basin, downstrearm of Shiyang River

LIU Xin, HAO Yuanyuan, HUA Limin. Spatial differentiation characteristics of soil salinity in Minqin Basin, downstream of Shiyang River, China[J].Arid Zone Research, 2023, 40(10): 1615-1624.

Figures/Tables 9

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土层/cm	变异模型	块金值 C₀	基台值 C₀+C	基底效应 C₀/(C₀+C）	变程 A₀/km	决定系数 R²	残差 RSS
0~10	指数模型	0.060	0.076	0.79	44.64	0.62	0.0002
10~20	指数模型	0.008	0.066	0.13	8.79	0.69	0.0002
20~30	指数模型	0.026	0.065	0.40	18.09	0.81	0.0002

土层/cm	平均误差 ME	均方根误差 RMSE	标准均值误差 MSE	标准均方根误差 RMSSE	平均标准误差 ASE
0~10	-0.004	0.25	-0.018	1.13	0.22
10~20	0.001	0.22	0.002	0.98	0.23
20~30	0.006	0.21	0.017	1.03	0.21

土层/cm	非盐土/%	轻度盐渍土/%	中度盐渍土/%	强度盐渍土/%	盐渍土/%
0~10	0.63	3.12	72.44	23.43	0.37
10~20	0.03	12.20	71.59	22.59	0.38
20~30	1.27	14.15	75.80	15.49	0.09

区域	采样点数	范围/(g·kg^-1)	平均值/(g·kg^-1)	标准差/(g·kg^-1)	标准误差/(g·kg^-1)	中位数/(g·kg^-1)
巴丹吉林沙漠边缘区	22个	1.31~32.08	3.96	2.05	0.44	3.33
民勤盆地腹地	70个	1.29~23.18	4.86	3.77	0.49	3.82
腾格里沙漠边缘区	38个	1.18~8.89	7.76	6.85	1.11	5.70

Spatial differentiation characteristics of soil salinity in Minqin Basin, downstream of Shiyang River, China

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