硫酸盐渍土表观电导率与水分、盐分及粒径关系研究

doi:10.13866/j.azr.2021.04.13

Abstract

Abstract:

This study first measured the sulfate saline soil in the Xiaoxigou basin of the Beishan area in the Xining Basin, China. Five groups of soil samples with different particle sizes (<0.075 mm, 0.075-0.1 mm, 0.1-0.25 mm, 0.25-0.5 mm, 0.5-1 mm, and 1-2 mm) were obtained through the screening test. The apparent electrical conductivity (EC_a) of the soil samples with different moisture contents, salt contents (Na₂SO₄), and particle sizes were then tested, and the relationship between EC_a and moisture content, salt content, and particle size were analyzed, and the gray correlation degree was obtained using the gray correlation method. The results showed that increased moisture content, salt content, and particle size resulted in an increasing change law for EC_a. For example, when the particle size was 0.075-0.1 mm, the salt content was 0.64%, and the moisture content increased from 5% to 25%, EC_a increased by 0.99 mS·cm^-1, an increase amplitude of 2475%. When the relationship model between EC_a, moisture content and salt content was established, it was concluded that under higher moisture contents (greater than 15%), the correlation between EC_a and salt content (P<0.05) was significantly higher than that of low moisture content conditions (less than 15%) (P>0.05). For example, when the moisture content was 10% or 20%, and the salt content increased from 3.18% to 12.18%, the increased amplitudes of EC_a were 56.41% and 128.91%, respectively, indicating that the sensitivity of salt to EC_aunder high moisture content conditions was more significant than the low moisture content. The average gray correlation degree between EC_a and the moisture content was 0.80, and between EC_aand salt content was 0.68. This indicates that the consistency of the development trend between EC_a and moisture content was higher than that of the salt content, when the moisture content was 5%-25%, and the salt content was 0.18%-12.18%. These research results have reference value for the evaluation of the electrical conductivity and salinization degree of sulfate saline soil.

Key words: sulfate saline soil, apparent electrical conductivity, water content, salt content, particle size, grey correlation

ZHOU Linhu,WANG Haoyu,ZHANG Binglai,QI Zhaoxin,CAO Rongtai,FAN Yanbin,SUN Shenhai,LIU Yuping. The relationship between EC_a of sulfate saline soil and moisture content, salt content, and particle size[J].Arid Zone Research, 2021, 38(4): 1020-1030.

Figures/Tables 16

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References 37

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粒径/mm	含水率/%
粒径/mm	5	10	15	20	25
<0.075	0.03±0.01	0.25±0.05	0.48±0.07	0.76±0.07	1.01±0.09
0.075~0.1	0.04±0.01	0.29±0.10	0.55±0.13	0.80±0.17	1.03±0.12
0.1~0.25	0.05±0.01	0.33±0.16	0.60±0.18	0.84±0.29	1.05±0.24
0.25~0.5	0.06±0.02	0.38±0.11	0.67±0.24	0.89±0.46	1.09±0.25
0.5~1	0.07±0.02	0.42±0.12	0.73±0.19	0.95±0.21	1.13±0.28
1~2	0.09±0.02	0.50±0.17	0.76±0.20	0.97±0.13	1.17±0.23

粒径/mm	拟合方程	拟合优度(R²)	残差平方和(RSS)	显著性系数(P)
<0.075	y=0.0071x^1.5470	0.9900	0.0046	1.4213×10^-4
0.075~0.1	y=0.0116x^1.4018	0.9837	0.0076	2.6167×10^-4
0.1~0.25	y=0.0164x^1.3024	0.9773	0.0108	3.8852×10^-4
0.25~0.5	y=0.0230x^1.2099	0.9673	0.0164	6.0342×10^-4
0.5~1	y=0.0292x^1.1499	0.9576	0.0228	8.3150×10^-4
1~2	y=0.0385x^1.0717	0.9559	0.0235	7.6895×10^-4

粒径/mm	含盐量/%
粒径/mm	0.18	3.18	6.18	9.18	12.18
<0.075	0.16±0.04	0.87±0.11	0.93±0.10	1.11±0.17	1.57±0.32
0.075~0.1	0.17±0.04	0.90±0.13	0.97±0.09	1.19±0.12	1.64±0.25
0.1~0.25	0.19±0.06	0.92±0.08	1.01±0.12	1.28±0.16	1.70±0.33
0.25~0.5	0.20±0.04	0.98±0.14	1.08±0.16	1.37±0.21	1.73±0.20
0.5~1	0.22±0.05	1.07±0.18	1.23±0.21	1.44±0.32	1.76±0.38
1~2	0.24±0.09	1.14±0.20	1.29±0.23	1.59±0.40	1.81±0.36

粒径/mm	拟合方程	拟合优度(R²)	残差平方和(RSS)	显著性系数(P)
<0.075	y=-0.0030x²+0.1393x+0.2367	0.8232	0.0918	0.0884
0.075~0.1	y=-0.0033x²+0.1479x+0.2429	0.8480	0.0868	0.0760
0.1~0.25	y=-0.0035x²+0.1558x+0.2532	0.8816	0.0727	0.0592
0.25~0.5	y=-0.0052x²+0.1788x+0.2571	0.8911	0.0703	0.0544
0.5~1	y=-0.0080x²+0.2141x+0.2714	0.8941	0.0706	0.0529
1~2	y=-0.0096x²+0.2384x+0.2806	0.9133	0.0631	0.0433

含盐量/%	含水率/%
含盐量/%	5	10	15	20	25
0.18	0.06±0.03	0.25±0.07	0.33±0.03	0.72±0.05	1.11±0.24
3.18	0.29±0.04	1.17±0.20	2.27±0.39	5.43±1.09	8.90±1.49
6.18	0.38±0.04	1.30±0.26	3.03±0.41	8.56±1.54	12.54±2.09
9.18	0.52±0.06	1.64±0.22	3.99±0.55	10.05±1.59	14.99±1.51
12.18	0.64±0.07	1.83±0.35	4.68±0.95	12.43±1.73	17.05±2.56

The relationship between EC_a of sulfate saline soil and moisture content, salt content, and particle size

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含盐量/%	土壤电导率与含水率拟合方程	拟合优度(R²)	残差平方和(RSS)	显著性水平(P)
0.18	y=0.0019x^1.9837	0.9804	0.0104	4.7251×10^-4
3.18	y=0.0038x^2.4149	0.9945	0.2070	9.1196×10^-5
6.18	y=0.0060x^2.3830	0.9785	1.7457	7.3282×10^-4
9.18	y=0.0088x^2.3191	0.9867	1.4969	3.4237×10^-4
12.18	y=0.0144x^2.2104	0.9710	4.4105	0.0011

含水率/%	土壤电导率与含盐量拟合方程	拟合优度(R²)	残差平方和(RSS)	显著性水平(P)
5	y=-0.0014x²+0.0630x+0.0644	0.9757	0.0024	0.0122
10	y=-0.0099x²+0.2436x+0.2899	0.9100	0.0674	0.0450
15	y=-0.0183x²+0.5730x+0.3449	0.9768	0.1317	0.0116
20	y=-0.0500x²+1.5527x+0.6521	0.9828	0.7059	0.0086
25	y=-0.1004x²+2.5066x+1.0689	0.9812	1.4804	0.0094

土壤含水率/%	土壤含盐量/%
土壤含水率/%	0.18	3.18	6.18	9.18	12.18
5	0.825	0.873	1.000	1.000	1.000
10	0.919	0.767	0.807	0.801	0.771
15	0.666	0.738	0.809	0.848	0.833
20	1.000	1.000	0.904	0.957	0.831
25	0.476	0.475	0.559	0.560	0.582
灰色关联度	0.777	0.771	0.816	0.833	0.803

土壤含盐量/%	土壤含水率/%
土壤含盐量/%	5	10	15	20	25
0.18	0.536	0.707	0.893	1.000	1.000
3.18	0.368	0.438	0.507	0.596	0.549
6.18	1.000	1.000	1.000	0.725	0.786
9.18	0.579	0.728	0.878	0.767	0.875
12.18	0.346	0.401	0.451	0.485	0.452
灰色关联度	0.565	0.655	0.745	0.715	0.733

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The relationship between ECa of sulfate saline soil and moisture content, salt content, and particle size

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The relationship between EC_a of sulfate saline soil and moisture content, salt content, and particle size