安徽省宣城市土壤硒地球化学特征及成因分析

doi:10.11720/wtyht.2022.1335

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摘要

通过1:25万多目标土壤地球化学调查采集的表、深层双网格土壤样品,对宣城市土壤硒地球化学特征及成因来源进行分析。结果表明:宣城市表层土壤Se含量在(0.12~8.80)×10^-6,平均含量0.44×10^-6,区内足硒和富硒土壤分布广泛,占比分别为61.90%和35.63%,富硒土壤主要分布在宁国市宁墩镇—绩溪县伏岭镇、泾县晏公镇—宣州区百棵树—水东镇、泾县陈村—赤坑山、广德县新杭镇等地。土壤Se含量主要受母岩及成土母质控制,震旦系蓝田组,寒武系荷塘组、杨柳岗组等含炭质泥页岩、炭质硅质泥岩分布区,二叠系、三叠系、石炭系、寒武系、奥陶系等灰岩分布区土壤Se含量高,燕山期中酸性侵入岩、第四系分布区土壤Se含量低。不同成土母质中碳酸盐岩类、浅色碎屑岩类、浅变质岩类母质土壤Se含量高于晚更新世黄土、河流冲积物以及酸性岩类母质Se含量;不同土壤类型中石灰岩土、粗骨土、石质土、红壤Se含量高于水稻土、黄褐土、潮土Se含量。土壤Se含量与V、Cd、Ba、Ag、Zn、Mo、U、Ni、Sb、P、S以及有机质等理化指标相关性较好,土壤全量硒与有效硒相关性较好。区内采集的47件水稻均富硒,富硒率100%,但茶叶和玉米均不富硒,蔬菜有部分富硒,表现出不同作物对土壤硒的吸收能力不同。

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	邢润华

关键词 ：宣城市, 土壤硒, 地球化学特征, 成因来源

Abstract：

This study investigates the geochemical characteristics and genesis of selenium (Se) in the soil in Xuancheng City, Anhui Province using the samples of surface and deep soil collected through a 1:250 000 multi-purpose geochemical survey. The results are as follows. The Se content in the surface soil in Xuancheng City is (0.12~8.80)×10^-6, with an average of 0.44×10^-6. Se-sufficient and Se-rich soils are widely distributed in the study area, accounting for 61.90% and 35.63%, respectively. Se-rich soils are mainly distributed in the Ningdun Town in Ningguo City-Fulingtown in Jixi County, Yangong Town in Jingxian County-Baikeshu area in Xuanzhou District, Chencun Village-Chikeng Mountain in Jingxian County, and Xinhang Town in Guangde County. The Se content in the soil is mainly controlled by parent rocks and soil-forming parent materials. Se content is high in soils in the distribution areas of carbonaceous shale and carbonaceous siliceous mudstones, such as the SinianLantian Formation and Cambrian Hetang and Yangliugang formations, as well as Permian, Triassic, Carboniferous, Cambrian, and Ordovician limestone distribution area. In contrast, Se content is low in Yanshanian intermediate-acid intrusive rocks and Quaternary distribution area. In terms of soil-forming parent materials, Se content is higher in soils with parent materials of carbonate, light clastic rocks, and epimetamorphic rocks than that in soils with parent materials of Late Pleistocene loess, alluvium, and acid rocks. In terms of soil type, Se content is higher in limestone soil, skeleton soil, stonysoil, and red soil than paddy soil, yellow-cinnamon soil, and fluvo-aquic soil. Se content in soil is correlated closely with physicochemical indices, such as V, Cd, Ba, Ag, Zn, Mo, U, Ni, Sb, P, S, and organic matter. Meanwhile, total Se content is correlated closely with bioavailable Se content. Furthermore, all the 47 rice samples collected in the study area are rich in selenium, with a selenium accumulation rate of 100%. However, tea and maize are not rich in Se, and some types of vegetables are rich in Se. Therefore, different types of crops have different absorption capacities of Se in the soil.

Key words： Xuancheng City selenium in the soil geochemical characteristics genesis

收稿日期: 2021-06-09 修回日期: 2021-08-16 出版日期: 2022-06-20

ZTFLH:

P632

基金资助:中国地质调查局地质调查项目 “淮河皖江经济区土地质量地球化学调查”(DD20160322)

作者简介: 邢润华(1973-),女,1994毕业于成都理工学院,高级工程师,地质调查与矿产勘查专业,主要从事土地质量地球化学调查、区域地质调查等工作。Email: xingrunhua@163.com

引用本文:

邢润华. 安徽省宣城市土壤硒地球化学特征及成因分析[J]. 物探与化探, 2022, 46(3): 750-760.
XING Run-Hua. Geochemical characteristics and genesis of selenium in soil in Xuancheng City, Anhui Province. Geophysical and Geochemical Exploration, 2022, 46(3): 750-760.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2022.1335 或 https://www.wutanyuhuatan.com/CN/Y2022/V46/I3/750

Fig.1 宣城市位置及地质图

Table 1 样品分析方法配套方案

Table 2 样品分析方法检出限

Fig.2 宣城市表层(a)、深层(b)土壤Se元素地球化学分布

Table 3 表、深层土壤Se含量分级及面积比例

Table 4 表层土壤相对深层土壤Se富集程度

Table 5 主要地层(岩性)形成的土壤Se含量统计

Table 6 不同成土母质形成的土壤Se含量对比

Fig.3 不同成土母质土壤硒含量等级比例

Fig.4 不同成土母质中主要土壤类型Se含量对比

Table 7 不同成土母质表、深层土壤Se 含量回归方程

元素	Se	V^**	Mo^**	Cr^**	U^**	Ba^**	Ag^**	Sb^**	Ni^**
r	1.00	0.80	0.75	0.69	0.69	0.65	0.65	0.51	0.49
元素	Zn^**	Cd^**	P^**	Corg^**	C^**	N^**	I^**	As^**	S^**
r	0.44^**	0.44^**	0.41^**	0.37^**	0.37^**	0.36^**	0.35^**	0.34^**	0.33^**
元素	Br^**	Y^**	B^**	Sc^**	Tl^**	Hg^**	TFe₂ $O 3 * *$	Ti^**	MgO^**
r	0.31	0.27	0.26	0.26	0.25	0.25	0.23	0.22	0.20
元素	Cu^**	Mn^**	Co^**	F^**	Pb^**	Ge^**	Li^**	Bi^**	La^**
r	0.19	0.19	0.18	0.17	0.13	0.09	0.09	0.06	0.05
元素	Ga^*	CaO	Au	W	Be	Nb	Ce	pH^*	Si $O 2 *$
r	0.04	0.01	0.00	-0.01	-0.02	-0.02	-0.03	-0.04	-0.04
元素	Sn^**	Al₂ $O 3 * *$	Cl^**	Rb^**	K₂O^**	Th^**	Sr^**	Zr^**	Na₂O^**
r	-0.05	-0.07	-0.07	-0.08	-0.08	-0.10	-0.14	-0.23	-0.25

Table 8 表层土壤Se与其他元素的相关系数

Fig.5 土壤硒与有机质相关性

Table 9 农作物富硒情况统计

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