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Geochemical characteristics and influential factors of soil selenium in typical agricultural area, Chongqing |
YU Fei1( ), ZHANG Feng-Lei1, ZHANG Yong-Wen1,2, WANG Rui1,3, WANG Jia-Bin1 |
1. Southeast Sichuan Geological Group,Chongqing Bureau of Geology and Minerals Exploration,Chongqing Key Laboratory of land quality geological survey,Chongqing 400038,China 2. College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China 3. School of Earth Sciences,China University of Geosciences,Beijing 100083,China |
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Abstract Nanchuan District is a typical agricultural area in Chongqing. The authors investigated the geochemical characteristics and influential factors of soil Se from Nanchuan District of Chongqing City to provide some scientific bases for the survey of environment background and regional production as well as human health. More than 8 496 soil samples from the topsoil layers(0~20 cm)all over the Nanchuan District were collected and analyzed for content and distribution of soil Se and their relationships with parent material, soil properties (pH and Corg), altitude and human factors. The research results show that the content of total selenium ranges from 0.056×10-6 to 10.80×10-6 with a mean value of 0.46×10-6, which indicates that the most of the soils are in the category of Se-sufficiency to Se-abundance, with 42.31% being Se-enrichment. The spatial characteristics of soil Se content in Nanchuan District show "high in the south and low in the north", and the soil Se enrichment areas are mainly distributed in Shuijiang Town, Nanping Town, Nanchuan urban area and Jinfo Mountain. Among the types of soils existing in the Nanchuan District, Se content is the highest in industrial and mining land soil and the lowest in farmland. The spatial characteristics of soil Se content and strata show a similar variation pattern. The soil Se enrichment is mainly distributed in Permian, Triassic (Feixianguan Formation and Jialingjiang Formation), Silurian, Ordovician and Cambrian strata, which indicates that the soil Se content is mainly controlled by parent materials in Nanchuan District. In addition, Se content in soil is significantly positively correlated with soil organic matter and altitudes, but significantly negatively correlated with soil pH.
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Received: 08 October 2019
Published: 28 August 2020
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Geographical location and geological map of the study area
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地区 | 含量范围/10-6 | 平均值/10-6 | 参考文献 | 重庆市南川区 | 0.056~10.80 | 0.46 | 本文 | 三峡库区(重庆段) | 0.006~5.79 | 0.16 | [1] | 重庆市江津区 | 0.049~3.11 | 0.32 | [8] | 陕西紫阳 | 0.0015~36.68 | 0.94 | [13] | 湖北省恩施市 | 2.70~87.3 | 9.36 | [11] | 江西省丰城市 | 0.40~0.99 | 0.54 | [15] | 贵州 | 0.06~1.33 | 0.37 | [16] | 广东 | 0.03~1.42 | 0.28 | [17] | 香港 | 0.07~2.26 | 0.76 | [18] | 黑龙江省 | 0.008~0.660 | 0.15 | [2] | 东北平原 | 0.01~5.3 | 0.18 | [9] | 北京平原 | 0.04~5.26 | 0.2 | [19] | 河北平原 | 0.05~0.34 | 0.19 | [20] | 中国 | 0.05~0.99 | 0.29 | [21] | 世界 | 0.03~2.00 | 0.4 | [5] |
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Se contents in surface soils in the study area and other region of China
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含量分级 | 硒含量阈值/10-6 | 硒效应 | 比例/% | 缺乏 | ≤0.125 | 缺Se | 1.71 | 边缘 | 0.125~0.175 | 潜在缺Se | 0.96 | 中等 | 0.175~0.40 | 足Se | 54.83 | 高 | 0.40~3.0 | 富Se | 42.31 | 过剩 | ≥3.0 | Se中毒 | 0.19 |
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Classification of soil Se content in the study area
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Content distribution map of soil in the study area
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地层 | 最小值/10-6 | 平均值/10-6 | 最大值/10-6 | 标准差/10-6 | 变异系数/% | 样本数 | J3p | 0.064 | 0.243 | 0.593 | 0.06 | 24.62 | 653 | J3sn | 0.075 | 0.251 | 0.783 | 0.07 | 27.41 | 602 | J2s | 0.071 | 0.235 | 4.154 | 0.13 | 53.6 | 1609 | J1z-J2x | 0.056 | 0.326 | 2.708 | 0.19 | 57.97 | 547 | T3xj | 0.062 | 0.391 | 1.773 | 0.22 | 55.83 | 400 | T2l | 0.124 | 0.411 | 2.565 | 0.23 | 55.12 | 301 | T1j | 0.108 | 0.734 | 10.802 | 0.66 | 89.29 | 562 | T1f | 0.098 | 0.902 | 3.439 | 0.48 | 53.03 | 211 | P | 0.123 | 1.026 | 5.15 | 0.594 | 57.903 | 498 | O | 0.084 | 0.479 | 3.227 | 0.27 | 55.53 | 1604 | S | 0.056 | 0.573 | 5.166 | 0.37 | 64.27 | 1509 | ∈ | 0.066 | 0.475 | 3.388 | 0.26 | 54.52 | 450 |
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Se contents in different strata of soil in the study area
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指标 | N | P | S | SiO2 | Al2O3 | Fe2O3 | MgO | CaO | Na2O | K2O | Se | 0.577** | 0.402** | 0.662** | -0.267** | -0.027 | 0.344** | 0.057** | 0.126** | -0.276 | -0.152 |
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The correlation coefficients between Se and major elements in soils in study area
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元素 | As | Cd | Cr | Cu | Hg | Ni | Zn | Pb | Se | 0.301** | 0.501** | 0.463** | 0.382** | 0.065** | 0.313** | 0.194** | 0.190** |
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The correlation coefficients between Se and heavy metal contents in soils in study area
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Correlation coefficients between Se and organic matter or pH of soil in the study area
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海拔/m | 最小值/10-6 | 平均值/10-6 | 最大值/10-6 | 标准差/10-6 | 变异系数/% | 样品数 | 0~500 | 0.09 | 0.31 | 1.76 | 0.27 | 0.87 | 625 | 500~1000 | 0.06 | 0.43 | 10.8 | 0.38 | 0.9 | 6825 | 1000~1500 | 0.06 | 0.54 | 3.4 | 0.32 | 0.59 | 1343 | 1500~2000 | 0.2 | 0.99 | 4.44 | 0.6 | 0.61 | 129 | ≥2000 | 0.64 | 1.38 | 2.89 | 0.53 | 0.38 | 23 |
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Se contents in different altitude of soil in the study area
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土地利用类型 | 农田 | 旱地 | 林地 | 园地 | 草地 | 村庄 | 城镇 | 工矿区 | 其他用地 | 样品数 | 2831 | 2193 | 2849 | 250 | 192 | 456 | 56 | 9 | 110 | 平均含量/10-6 | 0.4 | 0.46 | 0.45 | 0.44 | 0.45 | 0.51 | 0.9 | 0.69 | 0.5 |
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Se concentrations in different land use types of soil in the study area
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