【引用本文】 赵辰, 孙彬彬, 贺灵, 等. 四川昭觉县中部乡镇表层土壤硒地球化学特征[J]. 岩矿测试, 2022, 41(3): 412-426. doi: 10.15898/j.cnki.11-2131/td.202111250185
ZHAO Chen, SUN Binbin, HE Ling, et al. Geochemical Characteristics of Selenium in Surface Soil of Central Townships in Zhaojue County, Sichuan Province[J]. Rock and Mineral Analysis, 2022, 41(3): 412-426. doi: 10.15898/j.cnki.11-2131/td.202111250185

四川昭觉县中部乡镇表层土壤硒地球化学特征

1. 

自然资源部地球化学探测重点实验室,中国地质科学院地球物理地球化学勘查研究所,河北 廊坊 065000

2. 

联合国教科文组织全球尺度地球化学国际研究中心,河北 廊坊 065000

收稿日期: 2021-11-25  修回日期: 2021-12-28  接受日期: 2022-01-30

基金项目: 中国地质调查局地质调查项目(DD20190522-03)

作者简介: 赵辰,硕士研究生,助理工程师,主要研究方向为勘查地球化学。E-mail:619138825@qq.com

通信作者: 孙彬彬,博士研究生,高级工程师,主要研究方向为地球化学勘查与评价。E-mail:sbinbin@mail.cgs.gov.cn

Geochemical Characteristics of Selenium in Surface Soil of Central Townships in Zhaojue County, Sichuan Province

1. 

Key Laboratory of Geochemical Exploration, Ministry of Natural Resources; Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China

2. 

UNESCO International Centre on Global-scale Geochemistry, Langfang 065000, China

Corresponding author: SUN Binbin, sbinbin@mail.cgs.gov.cn

Received Date: 2021-11-25
Revised Date: 2021-12-28
Accepted Date: 2022-01-30

摘要:硒元素是人体必需的微量元素之一,食用富硒农产品是人体获取和补充硒元素的主要途径,调查区域硒地球化学特征是有效地利用富硒土地资源以及开发富硒农副产品的重要依据。本文选择四川省昭觉县域内较为重要的农耕乡镇采集表层土壤样品,采用原子荧光光谱法、X射线荧光光谱法、电感耦合等离子体质谱/发射光谱法等方法测定1328件土壤、19件玉米及20件土豆中硒等地球化学指标含量,利用相关分析与统计学等方法,结合距离加权反比插值法,探讨研究区硒含量、分布和影响因素等地球化学特征,评价土壤与作物的富硒情况及安全性。结果表明:①研究区表层土壤硒含量范围为0.04~1.50mg/kg,平均值为0.33mg/kg,划定富硒土壤面积为7.23km2,占全区土壤面积的30.31%,玄武岩发育的土壤硒含量最高,平均值为0.4mg/kg,表明区内地质背景与土壤硒含量密切相关,区内富硒土壤主要受含玄武岩夹苦橄岩、凝灰质砂泥岩的峨眉山玄武岩组地层控制;②不同的用地类型和土壤类型对硒元素的富集能力不同,人为农业活动导致土壤对硒的吸附能力下降,黄棕壤土层中黏粒或铁氧化物等易与硒结合富集;酸性土壤中硒含量与pH值成反比;土壤有机质与硒含量呈显著的正相关;土壤质地对硒含量具有一定的控制作用;③富硒土壤产出的玉米和土豆富硒率极低。研究结果认为昭觉县在开发利用富硒土壤时,旱地与水田等农耕区应及时补充有机肥并调节土壤酸碱度,并积极利用富硒资源开发其他农业产品。

关键词: 富硒, 表层土壤, 地球化学特征, 昭觉县, 原子荧光光谱法, X射线荧光光谱法, 电感耦合等离子体质谱/发射光谱法

要点

(1) 研究区富硒土壤面积为7.23km2,空间上与二叠系峨眉山玄武岩组地层分布一致,有较强规律性。

(2) 除成土母质外,用地类型、土壤类型、土壤pH值、土壤有机质及土壤质地等均对土壤硒的富集活化产生影响。

(3) 区内玉米和土豆作物重金属均未超标,但富硒率较低,其中玉米籽粒硒含量高于土豆。

Geochemical Characteristics of Selenium in Surface Soil of Central Townships in Zhaojue County, Sichuan Province

ABSTRACT

BACKGROUND:

Selenium (Se) is one of the essential trace elements for humans, and an important way for humans to obtain and supplement selenium is by eating natural selenium-enriched agricultural products. The geochemical characteristics of selenium in the survey area are an important basis for the effective utilization of selenium-enriched land resources and the development of selenium-enriched agricultural and sideline products.

OBJECTIVES:

To investigate the geochemical characteristics of selenium content, distribution and influence factors in the study area.

METHODS:

Soil and crop samples were collected from a central village of Zhaojue County, Sichuan Province. AFS, XRF and ICP-MS were used to determine the contents of elements including Se, Al2O3, TFe2O3, SiO2, OrgC, and pH values. Geochemical characteristics of selenium content, distribution and influencing factors in the study area were investigated using statistical and correlation analysis.

RESULTS:

(1) The soil selenium content in the study area ranged from 0.04 to 1.50mg/kg, with an average value of 0.33mg/kg. The delineated selenium-enriched soil area was 7.23km2, accounting for 30.31% of the total soil area. The selenium content of the soil developed in basalt was the highest, with an average of 0.4mg/kg, indicating that the geological background in the area was closely related to the soil selenium content. The Se-enriched soil in the area was mainly controlled by the Emeishan basalt Formation, which contained basalt intercalating with picrite and tuffaceous sand and mudstone. (2) The enrichment capacity of selenium varied in different land utilization and soil types. The absorption capacity of selenium in soil decreased due to human agricultural activities. Clayey particles or iron oxides in the yellow-brown loam layer were easy to combine and enrich selenium. The selenium content in acidic soil was inversely correlated to pH value. There was a significant positive correlation between soil organic matter and selenium content. Soil texture had a certain effect on selenium content. (3) Corn and potatoes from selenium-enriched soils had very low selenium content.

CONCLUSIONS:

During the exploitation and utilization of selenium-enriched soil, organic fertilizer should be added in time and soil pH should be adjusted in agricultural areas such as dry land and paddy field, and other agricultural products should be developed by using selenium-enriched resources.

KEY WORDS: selenium-enriched, surface soil, geochemical characteristics, Zhaojue County, atomic fluorescence spectrometry, X-ray fluorescence spectrometry, inductively coupled plasma-mass spectrometry/optical emission spectrometry

HIGHLIGHTS

(1) The selenium-enriched land covers 7.23km2, which is consistent with the distribution of Permian Emeishan basalt Formation, indicating strong regularity in space.

(2) In addition to soil parent material, land utilization type, soil type, soil pH value, soil organic matter and soil texture all affected the enrichment and activation of selenium in soil.

(3) Heavy metals in corn and potatoes did not exceed the standard, but the selenium enrichment rates were low, and silenium content was higher in corn than in potatoes.

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四川昭觉县中部乡镇表层土壤硒地球化学特征

赵辰, 孙彬彬, 贺灵, 吴超, 成晓梦, 曾道明, 刘冬