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| Spatial variability and ecological health risk assessment of heavy metals in farmland soil-rice system in a watershed of China |
| Received:October 27, 2020 |
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| KeyWord:heavy metal;soil-rice system;GIS;geostatistical analysis;spatial variability |
| Author Name | Affiliation | E-mail | | LI Zi-jie | College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | MENG Yuan-si | College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | ZHENG Meng-lei | College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | WANG Hui-hui | College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | CHEN Fu-rong | Geological Survey of Anhui Province, Hefei 230001, China | | | HU Hong-xiang | College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | MA You-hua | College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | yhma2020@qq.com |
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| Abstract: |
| To explore the heavy metal pollution in farmland soil-rice system, spatial variability and ecological health risks in a certain watershed were performed. From September to November 2017, 938 rice grain samples and the corresponding paddy soil samples were collected in a certain watershed, and these five heavy metal contents:Cd, Hg, As, Pb, and Cr were determined. Based on ArcGIS and SPSS, the ecological health risk of different heavy metals in the soil and rice was evaluated. Watershed was the research area, thus, the distribution, spatial variation, and ecological health risk of heavy metals in the soil-rice system in the research area were analyzed, and the following results and conclusions were drawn:From the perspective of spatial variability and distribution of heavy metals in the soil and rice grains in the study area, Cd, Hg, As, and Pb were moderately spatially autocorrelated, while Cr was weakly spatially correlated; the spatial correlation of the five heavy metals in the rice grain was weak. Except for Cr, the contents of the five heavy metals in the cultivated soil of the watershed were all high, and there was an obvious large patch of pollution in the southern and central areas, which spreads gently around. The risk of Cd and As in rice grains was high, mainly in the coastal area of a certain river basin. From the distribution heavy metal pollution risks of the soil-rice in the study area, there were significant differences in heavy metal risks among the different regions. The soil heavy metal risk index in the arable layer had a large span and was at a slight risk. The rice grain risk index had a small span, and there was no obvious difference in the heavy metal risk of rice grain in the different regions. Eleven points belonged to the medium risk level, while the rest belonged to the slight risk level. |
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