重庆侏罗纪地层区土壤硒含量分异:以江津和石柱地区为例

doi:10.19657/j.geoscience.1000-8527.2023.062

现代地质 ›› 2023, Vol. 37 ›› Issue (06): 1644-1654.DOI: 10.19657/j.geoscience.1000-8527.2023.062

重庆侏罗纪地层区土壤硒含量分异:以江津和石柱地区为例

刘永林¹^,²(), 赵家宇¹^,², 刘怡¹^,², 吴梅¹^,², 肖慧娴¹^,², 刘丁慧¹^,², 田兴磊³()

1.重庆师范大学GIS应用研究重点实验室,重庆 401331
2.重庆师范大学地理与旅游学院,重庆 401331
3.山东省地质科学研究院,山东济南 250013

收稿日期:2022-09-22 修回日期:2023-06-03 出版日期:2023-12-10 发布日期:2024-01-24
通讯作者: 田兴磊,男,博士,高级工程师,1987年出生,环境科学专业,主要从事健康地质研究。Email: xinglei_tian@163.com。
作者简介:刘永林,男,博士,副教授,1983年出生,环境科学专业,主要从事环境地球化学与健康研究。Email: liu3986130@163.com。
基金资助:
国家自然科学基金项目“重庆江津百岁老人与天然水、土壤中生命元素的区域分异研究”(41502329);重庆市教育委员会科学技术计划重点项目“相似地质环境下克山病区和长寿区域土壤硒及生物有效性的对比研究”(KJZDK202100504);重庆市自然科学基金项目“不同地层岩性下土地利用覆被变化对土壤硒及其赋存形态分异的影响机制”(CSTB2023NSCQ-MSX0496)

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

LIU Yonglin¹^,²(), ZHAO Jiayu¹^,², LIU Yi¹^,², WU Mei¹^,², XIAO Huixian¹^,², LIU Dinghui¹^,², TIAN Xinglei³()

1. Key Laboratory of GIS Application Research, Chongqing Normal University, Chongqing 401331, China
2. Geography and Tourism College, Chongqing Normal University, Chongqing 401331, China
3. Shandong Institute of Geological Sciences, Jinan, Shandong 250013, China

Received:2022-09-22 Revised:2023-06-03 Online:2023-12-10 Published:2024-01-24

摘要/Abstract

摘要：

相似地质背景区、相同成土母岩下土壤硒的空间分异特征的研究相对薄弱,长期制约着对土壤硒素分异机制的全面认识。本文以同处四川中生代前陆盆地且成土母岩同为侏罗纪陆相红色碎屑岩的重庆市江津区和石柱县为研究区,通过野外采样、室内分析和数理统计等方法,探讨土壤硒及其生物有效性的分异特征,对揭示土壤硒富集机制提供新的参考。结果表明,江津区表层土壤总硒(TSe)含量(0.32×10^-6)显著高于石柱县(0.21×10^-6);江津区富硒等级土壤占比46%,而石柱县为21%。江津区表土磷酸盐提取态硒(ASe)含量(0.03×10^-6)和ASe/TSe(11.2%),均显著高于石柱县(0.02×10^-6和9.9%)。与石柱县相比,江津区表土TSe、ASe与土壤有机质(SOM)的相关程度较强。研究认为,即使同发育在四川中生代前陆盆地侏罗纪陆相红色碎屑岩上的土壤,土壤硒含量及其生物有效性也具有显著性差异,而这种差异可能是由于土壤有机质含量等土壤理化性质差异影响了土壤硒的迁移和富集所致。

关键词: 硒, 侏罗纪, 陆相红色碎屑岩, 江津区, 石柱县

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

中图分类号:

P595
P534.5

刘永林, 赵家宇, 刘怡, 吴梅, 肖慧娴, 刘丁慧, 田兴磊. 重庆侏罗纪地层区土壤硒含量分异:以江津和石柱地区为例[J]. 现代地质, 2023, 37(06): 1644-1654.

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.

图/表 7

图1 四川盆地及邻区大地构造图(a)和重庆市江津区和石柱县地理位置(b)

Fig.1 Topographic map showing tectonic units of the Sichuan Basin and its adjacent regions (a) and geographic map of Jiangjin district and Shizhu County in Chongqing (b)

图2 江津区和石柱县构造简图(a)(c)及其对应的采样点分布(b)(d) K1w.下白垩统窝头山组;J3p.上侏罗统蓬莱镇组;J3sn.上侏罗统遂宁组;J2s.中侏罗统沙溪庙组;J1-2Z-xt.中—下侏罗统自流井群与新田沟组并层;J1Z.下侏罗统自流井群;T3xj.上三叠统须家河组;T2l.中三叠统雷口坡组;T1j.下三叠统嘉陵江组;T1d-j.下三叠统嘉陵江组与大冶组并层;T1f.下三叠统飞仙关组;P3w.上二叠统吴家坪组;P2-3q-w.中—上二叠统栖霞组、茅口组和吴家坪组并层;P1-2l-m.中—下二叠统梁山组、栖霞组和茅口组并层;D2yt.中泥盆统云台观组;S2-3l-hx.中—上志留统罗惹坪组与回星组并层;S1x-m.下志留统新滩组与马脚组并层;OS.奥陶系与志留系并层;O2g-b.中奥陶统牯牛潭组与宝塔组并层;O1n-dw.下奥陶统南津关组与大湾组并层;∈O.寒武系与奥陶系并层;∈2g-p.中寒武统高台组与平井组并层;∈1.下寒武统;Z.震旦系

Fig.2 Structural sketches (a) (c) and related sampling location (b) (d) of Jiangjin district and Shizhu County

表1 江津区和石柱县表土化学参数统计特征

Table 1 Statistics of soil chemical parameters in Jiangjin district and Shizhu County

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

图3 江津区和石柱县表土总硒箱型图(a)与不同硒含量占比(b)

Fig.3 Box plot of total Se content (a) in soils and proportion of Se level (b) between Jiangjin district and Shizhu County

图4 江津区和石柱县表土磷酸盐提取态硒含量(a)和占比(b)

Fig.4 Comparison of phosphate Se content (a) and proportion (b) in topsoil between Jiangjin district and Shizhu County

图5 江津区和石柱县表土硒与土壤理化性质相关系数矩阵(*指P<0.05;**指P<0.01) TSe.表土总硒;ASe.磷酸盐提取态硒;ASe/TSe.磷酸盐提取态硒占总硒比;BA.土壤风化淋溶系数[27]

Fig.5 Correlation coefficient matrix of selenium in topsoil and soil physicochemical properties in Jiangjin and Shizhu areas

图6 江津区(a)(c)(e)和石柱县(b)(d)(f)侏罗纪地层出露区表土硒含量分布特征 TSe.表土总硒;ASe.磷酸盐提取态硒;ASe/TSe.磷酸盐提取态硒占总硒比例

Fig.6 Distributions of topsoil Se content in the Jurassic strata in Jiangjin (a)(c)(e) and Shizhu (b)(d)(f) areas

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重庆侏罗纪地层区土壤硒含量分异:以江津和石柱地区为例

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

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