基于电磁感应数据的南疆棉田土壤pH反演研究

doi:10.13866/j.azr.2022.04.29

Abstract

Abstract:

Soil salinity aggregation will change soil acidity or alkalinity. As an important land resource reserve area in China, soil salinization and secondary salinization problems are frequent in Xinjiang, Therefore, accurately obtaining soil salinity information and effectively improving soil salinity is beneficial to regulating the contradiction between agricultural irrigation and freshwater resources. Such regulation is of considerable important to the sustainable development of agricultural production and ecological environment. In this study, the soil pH value of cotton fields in Alar Reclamation Area, southern Xinjiang, was taken as the research object, and the EM38-MK2 geodetic conductivity meter was used on the basis of electromagnetic induction technology to obtain soil apparent conductivity data of nine cotton fields in the Reclamation Area. In each cotton field, soil apparent conductivity thresholds were collected in accordance with cotton fields of 0-0.375, 0.375-0.75, 0.75-1.00 m depth, 54 profile samples were collected from three soil layers, and 486 soil profile samples were collected from nine cotton fields. The linear regression model between soil pH and soil apparent conductivity was constructed using two ideas of the global and different regions and combined with geostatistical software to quantify in cotton fields in the Reclamation Area. The two-tailed test results revealed that the correlation coefficients between apparent conductivity and soil pH were 0.60-0.95 for the idea of different regions under the condition of P < 0.01; while those for the global regions were 0.28-0.46. Both findings were highly significant negative correlations, indicating that EM38-MK2 could be used for the determination of soil pH. Linear regression models between apparent conductivity data and soil pH were constructed using the global region and different regions. The zonal models 0.74 ≤ R²≤ 0.93 and 2.00 ≤ RPD ≤ 3.50, which have smaller RMSE, showed high accuracy, indicating that the accuracy of the different region model is better than that of the global region models. Meanwhile, the accuracy of the soil pH inversion model is also higher in areas with higher salinity. The Kriging interpolation results showed that the soil pH in the deep layer of cotton fields in the Reclamation Area was higher than that in the surface layer due to the influence of winter irrigation, cotton root system and cotton dead leaves. This study aims to provide ideas for the rapid determination of soil pH. Therefore, soil acid-base risk prediction can be accurate, and effective risk countermeasures can be formulated rationally.

Key words: soil pH, soil apparent conductivity, inversion model, cotton fields, the spatial distribution, southern Xinjiang

WANG Jiawen,PENG Jie,JI Wenjun,BAI Jianduo,FENG Chunhui,LI Hongyi. Soil pH inversion based on electromagnetic induction data in cotton field of southern Xinjiang[J].Arid Zone Research, 2022, 39(4): 1293-1302.

Figures/Tables 11

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References 27

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土层/m	样本数/个	最大值	最小值	均值	标准差	变异系数/%
0~0.375	162	8.71	7.46	7.92	0.31	3.91
0.375~0.75	162	9.09	7.74	8.40	0.33	3.93
0.75~1.0	162	9.07	8.03	8.60	0.26	3.02
0~1.00	486	9.09	7.46	8.31	0.41	4.93

样地	样本数	最大值	最小值	均值	标准差	变异系数/%
1	18	9.02	7.96	8.58	0.38	4.43
2	18	8.80	8.03	8.47	0.18	2.16
3	18	8.72	7.46	8.09	0.39	4.83
4	18	8.93	7.55	8.31	0.43	5.20
5	18	8.94	7.83	8.43	0.34	3.99
6	18	8.59	7.55	8.20	0.32	3.94
7	18	8.99	7.89	8.41	0.35	4.17
8	18	8.66	7.66	8.29	0.31	3.68
9	18	9.09	7.81	8.34	0.48	5.75

	EC_h0.375	EC_h0.75	EC_v0.75	EC_v1.0	pH_0.375	pH_0.75	pH_1.0
EC_h0.375	1
EC_h0.75	0.96^**	1
EC_v0.75	0.94^**	0.97^**	1
EC_v1.0	0.79^**	0.91^**	0.92^**	1
pH_0.375	-0.30^**	-0.34^**	-0.28^**	-0.31^**	1
pH_0.75	-0.44^**	-0.45^**	-0.46^**	-0.45^**	0.50^**	1
pH_1.0	-0.42^**	-0.42^**	-0.43^**	-0.42^**	0.53^**	0.82^**	1

土层/m	建模因子
土层/m	EC_h0.375	（EC_h0.75+EC_v0.75）/2	EC_v1.0	EC_h0.375+（EC_h0.75+EC_v0.75）/2	（EC_h0.75+EC_v0.75）/2+EC_v1.0	EC_h0.375+（EC_h0.75+EC_v0.75）/2+EC_v1.0
0~0.375	0.80	0.76	0.72	0.87	0.83	0.88
0.375~0.75	0.67	0.62	0.56	0.84	0.78	0.84
0.75~1.00	0.81	0.80	0.79	0.82	0.80	0.84

土层/m	建模集			验证集
土层/m	R²	RMSE	RPD	R²	RMSE	RPD
0~0.375	0.21	0.26	0.87	0.13	0.31	0.82
0.375~0.75	0.38	0.26	1.06	0.33	0.26	1.05
0.75~1.00	0.29	0.22	0.95	0.21	0.22	0.99

Soil pH inversion based on electromagnetic induction data in cotton field of southern Xinjiang

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样地	土层/m	R²	RMSE	RPD
1	0~0.375	0.77	0.03	2.01
	0.375~0.75	0.79	0.04	2.17
	0.75~1.00	0.87	0.01	2.07
2	0~0.375	0.87	0.04	2.02
	0.375~0.75	0.83	0.08	2.07
	0.75~1.00	0.82	0.05	2.18
3	0~0.375	0.93	0.04	3.50
	0.375~0.75	0.75	0.10	2.00
	0.75~1.00	0.84	0.03	2.02
4	0~0.375	0.75	0.12	2.13
	0.375~0.75	0.89	0.09	2.94
	0.75~1.00	0.90	0.09	3.09
5	0~0.375	0.83	0.08	2.30
	0.375~0.75	0.84	0.10	2.29
	0.75~1.00	0.74	0.08	2.11
6	0~0.375	0.87	0.12	2.14
	0.375~0.75	0.87	0.06	2.06
	0.75~1.00	0.88	0.05	2.25
7	0~0.375	0.89	0.04	2.08
	0.375~0.75	0.81	0.08	2.13
	0.75~1.00	0.79	0.06	2.08
8	0~0.375	0.81	0.08	2.32
	0.375~0.75	0.85	0.08	2.50
	0.75~1.00	0.90	0.11	2.21
9	0~0.375	0.77	0.08	2.01
	0.375~0.75	0.89	0.07	2.03
	0.75~1.00	0.89	0.07	2.21

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