【引用本文】 成晓梦, 孙彬彬, 贺灵, 等. 四川省沐川县西部地区土壤硒含量特征及影响因素[J]. 岩矿测试, 2021, 40(6): 808-819. doi: 10.15898/j.cnki.11-2131/td.202106080072
CHENG Xiao-meng, SUN Bin-bin, HE Ling, et al. Content Characteristics and Influencing Factors of Soil Selenium in Western Muchuan County, Sichuan Province[J]. Rock and Mineral Analysis, 2021, 40(6): 808-819. doi: 10.15898/j.cnki.11-2131/td.202106080072

四川省沐川县西部地区土壤硒含量特征及影响因素

1. 

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

3. 

中国地质调查局土地质量地球化学调查评价研究中心, 河北 廊坊 065000

收稿日期: 2021-06-08  修回日期: 2021-07-01  接受日期: 2021-08-28

基金项目: 中国地质调查局地质调查项目(DD20190522-03,DD20190522-07)

作者简介: 成晓梦, 工程师, 主要从事生态地球化学研究。E-mail: cxiaomeng@mail.cgs.gov.cn

通信作者: 贺灵, 高级工程师, 主要从事生态地球化学调查与研究。E-mail: lingh1237@163.com

Content Characteristics and Influencing Factors of Soil Selenium in Western Muchuan County, Sichuan Province

1. 

Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China

2. 

International Center on Global Scale Geochemistry, UNESCO, Langfang 065000, China

3. 

Research Center of Geochemical Survey and Assessment of Land Quality, China Geological Survey, Langfang 065000, China

Corresponding author: HE Ling, lingh1237@163.com

Received Date: 2021-06-08
Revised Date: 2021-07-01
Accepted Date: 2021-08-28

摘要:硒是人体和动物必需的微量有益元素,摄入适量硒是提高人群生活质量的重要标志。食用富硒农产品是缺硒地区人体获取和补充硒元素的重要途径。调查土壤硒的含量特征、圈定富硒土壤资源分布区、查明土壤硒迁移富集的影响因素,是高效利用富硒土壤资源和科学开发富硒农产品的重要依据。本文选择四川省沐川县西部地区采集土壤样品,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土壤中Se、Al2O3、TFe2O3、OrgC、Cd等元素含量和pH值,利用统计学及相关分析等方法研究了土壤硒等元素含量和分布特征,并对土壤硒含量的主要影响因素进行探讨。结果表明:①研究区表层土壤硒含量范围为0.08~1.30mg/kg,平均含量为0.39±0.15mg/kg,满足富硒土壤条件的土壤面积为112km2,占研究区总面积的52%,其中无公害富硒土壤面积为35km2。土壤Cd含量是造成富硒土壤和无公害富硒土壤面积具有较大差异性的主要因素。②地质背景与土壤硒含量密切相关,富硒土壤主要受含碳酸盐岩及夹碳质地层的砂岩、粉砂岩等地层控制,土壤硒来源稳定;③土壤硒含量随pH值、风化程度的降低而升高,随有机质、TFe2O3、S含量的升高而升高,其中有机质对土壤硒的影响显著大于TFe2O3,表明该区域铁氧化物对硒的吸附能力低于有机质。综上所述,研究区富硒土壤资源丰富,建议当地充分利用相关资源开发富硒农产品,同时应注重有机肥的平衡施肥,并进一步加强土壤-作物系统中硒迁移富集影响因素的协同分析。

关键词: 土壤硒, 影响因素, 成土母质, 沐川县, 原子荧光光谱法, 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112km2,其中无公害富硒土壤面积为35km2,富硒土壤资源丰富。

(2) 地质背景与土壤硒含量密切相关,富硒土壤主要受含碳酸盐岩及夹碳质地层的砂岩、粉砂岩等地层控制。

(3) 土壤pH、有机质、TFe2O3、S及土壤风化程度均对土壤硒的富集活化产生影响,其中铁氧化物对硒的吸附能力低于有机质。

Content Characteristics and Influencing Factors of Soil Selenium in Western Muchuan County, Sichuan Province

ABSTRACT

BACKGROUND:

Selenium (Se) is an essential beneficial trace element for human and animals; taking an appropriate amount of selenium is an important sign to improve the quality of life. Eating selenium-rich agricultural products is an important way for humans to obtain and supplement selenium in low-Se regions. Investigating the content characteristics of soil selenium, delineating the distribution of selenium-enriched soil resources and identifying the influencing factors of soil selenium migration and enrichment can provide a sound basis for the efficient utilization of selenium-enriched soil resources and scientific development of selenium-enriched agricultural products.

OBJECTIVES:

To reveal the content, distribution characteristics and influencing factors of selenium in soils from the study area.

METHODS:

Soil samples were collected from the western area of Muchuan County, Sichuan Province. AFS, ICP-MS and XRF were used to determine the elemental content (Se, Al2O3, TFe2O3, OrgC, Cd) and pH values. The content, distribution and influencing factors of soil selenium in the study area were evaluated using statistical and correlation analysis.

RESULTS:

The results showed that: (1) The content of selenium in the study area ranged from 0.08 to 1.30mg/kg, with an average value of 0.39±0.15mg/kg. The selenium-rich land was 112km2, accounting for 52% of the total area, of which the nuisanceless selenium-rich land was 35km2. Soil Cd content was the main factor causing the great difference between selenium-enrich soil and nuisanceless selenium-rich soil. (2) The geological background was closely related to the soil selenium content, which was mainly controlled by carbonate rocks, sandstone and siltstone intercalated with carbonaceous strata. The source of soil selenium was stable. (3) The soil selenium content decreased with pH and ba value, meanwhile, they increased with TFe2O3 and S content. The effect of organic matter on soil selenium was significantly greater than TFe2O3, indicating that the adsorption capacity of TFe2O3 for selenium in this area was lower than organic matter.

CONCLUSIONS:

Selenium-enriched land resources are abundant in the study area. The content of soil selenium is affected by geological background and physical and chemical properties. It is suggested that local governments make full use of relevant resources to develop selenium-enriched agricultural products. At the same time, attention should be paid to the balanced fertilization of organic fertilizers. The collaborative analysis of factors affecting the migration and enrichment of selenium in the soil-crop system should be further strengthened.

KEY WORDS: soil selenium, influencing factors, parent materials, Muchuan County, atomic fluorescence spectrometry, inductively coupled plasma-mass spectrometry/optical emission spectrometry

HIGHLIGHTS

(1) The selenium-rich land covers 112km2, including 35km2 nuisanceless selenium-rich land. The selenium-rich land resources are abundant in the study area.

(2) The geological background is closely related to the soil selenium contents, which is mainly controlled by carbonate rocks, sandstone and siltstone intercalated with carbonaceous strata.

(3) Soil pH, organic matter, TFe2O3, S and weathering degree are important factors affecting the enrichment and activation of soil selenium. The effect of organic matter on soil selenium is significantly greater than TFe2O3.

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四川省沐川县西部地区土壤硒含量特征及影响因素

成晓梦, 孙彬彬, 贺灵, 吴超, 赵辰, 曾道明