Differentiation Mechanism of Se Concentration in Soil Covering the Jurassic Strata in Chongqing: Case Studies from Jiangjin and Shizhu Regions

doi:10.19657/j.geoscience.1000-8527.2023.062

Abstract

Abstract:

The differentiation mechanism of selenium (Se), and its bioavailability in soils developed from same pedogenic rocks in a similar geological environment remains elusive.To further explore the above issue, the surface soil samples above the Jurassic continental red beds were collected from the Jiangjin district (Se-rich) and Shizhu County (Se-poor) of Chongqing, and their chemical compositions were analyzed.This study provides an important reference to reveal the soil Se enrichment mechanism, and shows that the total soil Se content (TSe) at Jiangjin (0.32×10^-6, arithmetic mean) is much higher than that of the Shizhu County (0.21×10^-6).The proportion of Se-rich soil is 46% at Jiangjin and 21% at Shizhu.The phosphate extractable Se (ASe) content and ASe/TSe ratio at Jiangjin are significantly higher than those at Shizhu (0.02×10^-6 and 9.9%, respectively).A stronger positive correlation between the TSe and ASe and organic matter (SOM) in the soil at Jiangjin than at Shizhu are revealed.It is concluded that the soil Se content and its bioavailability are very different from those developed on the Jurassic red beds in the Mesozoic Sichuan foreland basin, and this difference may be caused by the differences in soil physicochemical properties (such as the soil organic matter content), which affected the soil Se migration and enrichment.

Key words: selenium, Jurassic, continental red bed, Jiangjin district, Shizhu County

CLC Number:

P595
P534.5

LIU Yonglin, ZHAO Jiayu, LIU Yi, WU Mei, XIAO Huixian, LIU Dinghui, TIAN Xinglei. Differentiation Mechanism of Se Concentration in Soil Covering the Jurassic Strata in Chongqing: Case Studies from Jiangjin and Shizhu Regions[J]. Geoscience, 2023, 37(06): 1644-1654.

Figures/Tables 7

References 44

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地区	数据类型	pH	SOM	TSe	ASe	ASe/TSe	Al₂O₃	CaO	Fe₂O₃	K₂O	MgO	Na₂O	P	Ti	BA
江津区	最小值	4.10	0.7	0.07	0.003	1.13	4.07	0.07	1.30	0.51	0.42	0.14	109	1183	0.19
	最大值	7.68	45.5	1.50	0.100	33.28	23.66	6.79	6.96	3.61	3.44	3.27	1855	5777	1.33
	平均值	6.00	14.5	0.32	0.033	11.18	12.60	1.14	4.34	2.18	1.56	1.52	614	3488	0.51
	中位值	6.10	15.0	0.28	0.031	11.32	12.52	0.91	4.31	2.21	1.59	1.58	570	3377	0.51
	标准差	0.66	6.51	0.19	0.020	4.73	1.89	0.99	0.72	0.46	0.45	0.66	272	582	0.13
石柱县	最小值	4.33	4.05	0.07	0.002	3.20	11.51	0.04	3.38	1.48	0.67	0.28	171	3531	0.20
	最大值	8.76	66.5	0.62	0.090	27.44	21.07	6.23	7.07	3.65	2.62	5.31	1331	5715	0.90
	平均值	6.58	22.4	0.21	0.020	9.91	14.41	1.09	4.96	2.59	1.64	1.76	605	4215	0.49
	中位值	6.44	20.6	0.22	0.019	8.76	14.27	0.94	4.93	2.67	1.70	1.82	586	4176	0.50
	标准差	1.09	1.12	0.12	0.010	4.25	1.39	0.85	0.67	0.46	0.45	0.84	230	345	0.10

地区	数据类型	pH	SOM	TSe	ASe	ASe/TSe	Al₂O₃	CaO	Fe₂O₃	K₂O	MgO	Na₂O	P	Ti	BA
江津区	最小值	4.10	0.7	0.07	0.003	1.13	4.07	0.07	1.30	0.51	0.42	0.14	109	1183	0.19
	最大值	7.68	45.5	1.50	0.100	33.28	23.66	6.79	6.96	3.61	3.44	3.27	1855	5777	1.33
	平均值	6.00	14.5	0.32	0.033	11.18	12.60	1.14	4.34	2.18	1.56	1.52	614	3488	0.51
	中位值	6.10	15.0	0.28	0.031	11.32	12.52	0.91	4.31	2.21	1.59	1.58	570	3377	0.51
	标准差	0.66	6.51	0.19	0.020	4.73	1.89	0.99	0.72	0.46	0.45	0.66	272	582	0.13
石柱县	最小值	4.33	4.05	0.07	0.002	3.20	11.51	0.04	3.38	1.48	0.67	0.28	171	3531	0.20
	最大值	8.76	66.5	0.62	0.090	27.44	21.07	6.23	7.07	3.65	2.62	5.31	1331	5715	0.90
	平均值	6.58	22.4	0.21	0.020	9.91	14.41	1.09	4.96	2.59	1.64	1.76	605	4215	0.49
	中位值	6.44	20.6	0.22	0.019	8.76	14.27	0.94	4.93	2.67	1.70	1.82	586	4176	0.50
	标准差	1.09	1.12	0.12	0.010	4.25	1.39	0.85	0.67	0.46	0.45	0.84	230	345	0.10