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| Selenium input flux in farmland soil of 9 counties in the middle east of Guangxi |
Xue CHEN1,2( ), Zhong-Fang YANG1(), Yue-Long CHEN1, Qiong YANG1, Lei WANG3,4, Xue-Ji WEI4,5 |
1. China University of Geosciences(Beijing),Beijing 100083,China
2. Gold Geological Institute of CAPF,Langfang 065000,China
3. No. 4 Geological Party of Guangxi Zhuang Autonomic Region,Nangning 530031,China
4. Project Office of Land Quality Geochemical Assessment of Guangxi,Nanning 530023,China
5. Guangxi Geophysical Investigation Institute,Liuzhou 545005,China |
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Abstract The input flux of Se in farmland soil of 9 counties in the middle east of Guangxi were studied. By integrating various factors, the authors took the atmospheric wet and dry depositions as the main input way of Se. The average atmospheric wet and dry deposition flux in the whole study area is 6.36 g/(hm2·a), the irrigation water input flux possesses the second position, whereas the fertilization input flux is obviously lower. They account for 70.93%,27.35% and 1.72% of Se in soil respectively. Their proportions are somewhat different among 9 counties of the study area: the contribution of the atmospheric wet and dry deposition is the highest, accounting for more than 50%. Therefore, the atmospheric wet and dry depositions seem to be the main input ways of Se in the study area. The regional differences of Se input flux and the proportion of different input routes in the study area are basically consistent with the total amount of As, Cd, Cr6+, Hg and Pb in the field soils. These data show that the inputs bring in not only the beneficial element Se but also a certain amount of heavy metals. Therefore, the pollution of heavy metals in soil caused by the inputs should be strictly prevented and controlled.
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Received: 29 March 2019
Published: 28 August 2020
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Corresponding Authors:
Zhong-Fang YANG
E-mail: 377850218@qq.com;zfyang01@126.com
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Map of the sampling locations of 3 outside-sourced in the middle east of Guangxi
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| 项目 | Cd | Pb | As | Hg | Se | Cr | | 灌溉水(南宁) | 0.06* | 0.07* | 0.4* | 0.05* | 0.2* | 0.004** | | 湿沉降(南宁) | 0.06* | 0.07* | 0.4* | 0.05* | 0.2* | 0.004** | | 干沉降(南宁) | 0.02 | 0.4 | 0.2 | 0.0002 | 0.004 | 0.4 | | 化肥(南宁) | 0.02 | 0.4 | 0.2 | 0.0002 | 0.004 | 0.4 | | 化肥(南京) | 0.02 | 2 | 0.8 | 0.02 | 0.01 | 3 | | 化肥(武汉) | 0.02 | 0.1 | 0.05 | 0.0005 | 0.01 | 0.4 | | 化肥(合肥) | 0.02 | 1 | 0.2 | 0.0005 | 0.01 | 1 | | 化肥(福建) | 0.03 | 0.01 | 0.05 | 0.0005 | 0.01 | 0.01 | | 测试方法 | ICP-MS | ICP-MS | AFS | AFS | AFS | COL、ICP-MS、
ICP-AES |
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Analysis method and detection limit of elements in samples
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| 地区 | 输入途径 | As | Cd | Cr6+ | Hg | Pb | Se | | 大气干湿沉降 | 7.9 | 1.4 | 126 | 2.6 | 37 | 3.2 | | 北流市 | 施肥 | 11 | 0.03 | 3.5 | 0.01 | 1.3 | 0.04 | | 灌溉水 | 0.017 | 0.000 | 0.024 | 0.000 | 0.008 | 0.007 | | 大气干湿沉降 | 7.5 | 1.1 | 111 | 2.1 | 30 | 3.1 | | 博白县 | 施肥 | 5.4 | 0.28 | 7.2 | 0.04 | 2.2 | 0.07 | | 灌溉水 | 0.024 | 0.000 | 0.024 | 0.000 | 0.003 | 0.005 | | 大气干湿沉降 | 7.5 | 1.3 | 112 | 1.0 | 33 | 2.8 | | 兴业县 | 施肥 | 13 | 0.31 | 5.9 | 0.10 | 57 | 0.50 | | 灌溉水 | 0.020 | 0.001 | 0.024 | 0.001 | 0.007 | 0.002 | | 大气干湿沉降 | 11 | 1.7 | 72 | 1.6 | 62 | 3.0 | | 港南区 | 施肥 | 21 | 0.22 | 16 | 0.05 | 4.3 | 0.25 | | 灌溉水 | 0.025 | 0.000 | 0.024 | 0.000 | 0.001 | 0.001 | | 大气干湿沉降 | 6.7 | 1.3 | 77 | 1.9 | 72 | 5.6 | | 平南县 | 施肥 | 5.5 | 0.12 | 6.2 | 0.02 | 1.3 | 0.05 | | 灌溉水 | 0.019 | 0.000 | 0.012 | 0.000 | 0.005 | 0.001 | | 大气干湿沉降 | 13 | 4.0 | 123 | 4.2 | 87 | 15 | | 鹿寨县 | 施肥 | 6.2 | 0.18 | 19 | 0.02 | 2.4 | 0.11 | | 灌溉水 | 0.008 | 0.000 | 0.024 | 0.000 | 0.002 | 0.002 | | 大气干湿沉降 | 14 | 4.3 | 123 | 5.1 | 162 | 15 | | 临桂区 | 施肥 | 8.6 | 0.10 | 8.6 | 0.10 | 3.0 | 0.22 | | 灌溉水 | 0.006 | 0.000 | 0.024 | 0.000 | 0.001 | 0.001 | | 大气干湿沉降 | 5.8 | 21 | 58 | 2.9 | 90 | 2.5 | | 象州县 | 施肥 | 3.3 | 0.10 | 8.9 | 0.01 | 0.95 | 0.08 | | 灌溉水 | 0.017 | 0.000 | 0.024 | 0.001 | 0.001 | 0.002 | | 大气干湿沉降 | 13 | 4.8 | 114 | 3.4 | 97 | 6.8 | | 兴宾区 | 施肥 | 3.6 | 0.11 | 7.7 | 0.03 | 1.8 | 0.07 | | 灌溉水 | 0.008 | 0.000 | 0.024 | 0.001 | 0.001 | 0.002 |
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The 3 outside-sourced input fluxes of Se and heavy metals in study areag/(hm2·a)
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The average deposition flux of Se and heavy metals in 9 counties of the middle east of Guangxi
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The average irrigation flux of Se and heavy metals in 9 counties of the middle east of Guangxi
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| 肥料种类 | 样品数 | Se | As | Cd | Cr6+ | Hg | Pb | | 复合肥 | 125 | 0.13 | 16.03 | 0.46 | 13.43 | 0.07 | 3.90 | | 氮肥 | 35 | 0.02 | 5.23 | 0.02 | 1.95 | 0.01 | 0.60 | | 磷肥 | 10 | 1.59 | 88.83 | 1.06 | 111.13 | 0.51 | 151.24 | | 钾肥 | 26 | 0.04 | 0.80 | 0.01 | 1.41 | 0.01 | 0.75 | | 有机肥 | 12 | 0.67 | 5.42 | 0.60 | 19.21 | 0.14 | 9.87 |
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Average contents of Se and heavy metals in fertilizers in the study area10-6
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The average fertilization flux of Se and heavy metals in 9 counties of the middle east of Guangxi
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The average input flux of Se and heavy metals in 9 counties of the middle east of Guangxi
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Contributions of different input types to total inputs of Se in 9 counties of the middle east of Guangxi
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Contributions of different input types to total inputs of Se and heavy metals
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