江苏省里下河地区富硒土壤元素地球化学特征及其成因机制

doi:10.11720/wtyht.2024.1369

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Abstract

Based on relevant eco-geochemical survey data collected fromthe Lixiahe plain area in Jiangsu Province,this study systematically explored the geochemical characteristics of elements in Se-rich soils and the genetic mechanism through elemental distribution contrast, correlation analysis, R-type cluster analysis, and principal component analysis. This study can be referenced for the rational production and utilization of Se-rich land resources of the Quaternary sedimentary type. Key findings are as follows: (1)Se-rich soilsin the Lixiahe area are typical Quaternary sediments, and the closed lagoon facies sedimentary environment characterized by rich organic matter and slightly reducing conditions plays a foundational role in the formation of local Se-rich soils;(2) Typical element association, Se-OM-N-K-Fe-Co, in Se-rich soils is primarily located within a depth of 30 cm from the surface, with Se content ranging mostly from 0.3×10^-6 to 0.4×10^-6 in a uniform distribution; (3) Significant positive correlations between Se and some other elements can be observed in the soils, with the correlation coefficients (r)between Se and OM,and Se and CEC being 0.74 and 0.66, respectively.In contrast, Se exhibits a significant negative correlation with pH, with a correlation coefficient of -0.35; (4) The formation of Se-rich soilsmight have experienced three Se enrichment stages: the initial enrichment in soil parent materials, the re-enrichment during soil formation, and the supergene enrichment after soil formation, accompanied by interference from non-lagoon facies sediments (such as marine sediments). Organic matter adsorption, colloid adsorption, and biogeochemistry constitute the main causes of Se enrichment in the soils; (5) The Se-rich soils are also relatively enriched in heavy metal elements like Cu, Pb, Zn, Ni, Co, and V, which are within the national limit standards.

Key words： Se-rich soil element geochemical characteristics geneticmechanism Lixiahe area Jiangsu Province

Received: 25 August 2024 Published: 19 September 2024

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	Qi-Lin LIAO
	Shun-Sheng HUANG
	Wei-Wei XU
	Xiao-Dan CUI
	Yang JIN
	Ling LIU
	Yuan-Yuan WANG
	Wen-Bo LI
	Qiang ZHOU

Cite this article:

Qi-Lin LIAO,Shun-Sheng HUANG,Wei-Wei XU, et al. Elemental geochemical characteristics and genetic mechanisms of Se-rich soils in the Lixiahe area in Jiangsu Province[J]. Geophysical and Geochemical Exploration, 2024, 48(4): 1114-1124.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1369 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I4/1114

Spatial distribution of the main Se-enriched soil in Jiangsu Province and studied area location

指标	$X — m i n$	$X — m a x$	$X —$	C_V	$X — g$	S_a	$X — m i n a$	$X — m a x a$	$X — a$	C_Va	里下河土壤均值	江苏省土壤均值^[19]	石嘴山富硒土壤均值
Se	0.26	0.7	0.30	0.16	0.30	1179	0.26	0.35	0.29	0.09	0.20	0.21	0.34
OM	1.46	10.84	4.33	0.24	4.20	1268	1.95	6.54	4.25	0.22	2.28	1.88	1.89
N	404	5035	2335	0.23	2274	1275	1142	3474	2314	0.20	1431	1252	978
P	359	3688	1024	0.32	983	1219	474	1466	962	0.21	703	791	983
K	1.43	2.54	1.99	0.08	1.98	1236	1.68	2.32	2.00	0.06	1.91	1.82	1.35
Ca	0.61	3.77	0.98	0.43	0.92	1052	0.61	1.03	0.82	0.10	1.33	2.13	4.97
Mg	0.58	1.60	1.01	0.15	1.00	1160	0.78	1.18	0.98	0.08	0.97	1.01	1.53
Fe	1.93	5.47	3.48	0.14	3.44	1201	2.58	4.39	3.48	0.10	3.57	3.35	3.19
Mn	216	2944	493	0.29	478	1194	264	667	465	0.17	583	629	645
Mo	0.19	17.40	0.77	1.25	0.64	1094	0.26	0.86	0.56	0.22	0.48	0.55	60
B	26.3	145.0	57.0	0.15	56.0	1158	47.0	70.0	58.0	0.08	57	56	0.82
F	265	986	603	0.16	595	1249	403	799	599	0.14	573	546	660
Cl	37.4	1031	138	0.58	122	1180	37	227	118	0.37	100	209	-
As	3.29	17.50	7.81	0.22	7.62	1223	4.45	10.90	7.69	0.17	8.7	9.4	12.91
Cd	0.11	0.59	0.23	0.32	0.22	1173	0.12	0.30	0.21	0.18	0.133	0.151	0.21
Hg	0.037	0.440	0.095	0.39	0.089	1197	0.037	0.140	0.086	0.26	0.062	0.082	0.038
Sb	0.38	15.70	0.86	0.54	0.83	1180	0.46	1.14	0.80	0.17	0.83	0.96	-
Cu	11.3	354.0	31.0	0.38	30.0	1156	19.0	41.2	30.0	0.15	27	26	24
Pb	18.4	48.2	28.0	0.14	28.0	1233	20.0	35.6	28.0	0.11	25.9	26.8	23
Zn	55.2	368.0	97.0	0.23	95.0	1134	67.0	116.0	92.0	0.11	74	73	72
Cr	54.2	210.0	87.0	0.16	86.0	1217	66.0	106.0	86.0	0.09	81	76	66
Ni	16.5	445.0	37.0	0.39	36.0	1213	25.0	48.6	37.0	0.13	34.6	32.9	32
Co	6.21	21.20	14.00	0.15	14.00	1189	10.00	17.50	14.00	0.11	13.6	13.7	13
V	48.2	142.0	95.0	0.15	94.0	1272	62.0	128.0	95.0	0.14	92	88	-
CEC	86	333	199	0.20	195	1289	105	290	198	0.19	-	-	-
pH	4.46	8.47	6.54	0.13	6.49	1311	4.63	8.47	6.54	0.13	7.19	7.33	8.51

Geochemical parameters of elements of selenium-enriched soil in Lixiahe area

Variation of Se and other elements in typical soil sedimentary profile in the Lixiahe Se-rich area

Correlation coefficients of elements content in the Se-enriched soils in Lixiahe area

Dendrogram of Se and other elements or geochemical indicators of Se-rich soil in the Lixiahe area

Rotated component matrix of elements distribution in Se-rich soil from the Lixiahe area

Genetic model of Se-enriched soil in the Lixiahe area

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