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| Effect of ecological buffer patterns on abating soil erosion and heavy metal diffusion in riverbanks near mining waste catchments |
| Received:October 27, 2021 |
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| KeyWord:mining wasteland;ecological buffer zone;erosion;heavy metal;plant |
| Author Name | Affiliation | E-mail | | DENG Jiangdi | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZHANG Can | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LI Yu | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LI Bo | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZU Yanqun | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | 649332092@qq.com | | LI Yuan | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | CHEN Jianjun | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | ZHANG Zhou | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | |
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| Abstract: |
| To study the reduction of heavy metal diffusion through the creation of ecological buffer zones, field experiments were conducted with different shrub/grass ecological buffer patterns on the riverbank at the section of the Rabbit Mountain Mine in Lanping County, Yunnan Province, from June to November 2020. Vegetation growth conditions, heavy metal accumulation in plants, soil erosion, and heavy metal diffusion were measured in eight different shrub/grass patterns. The results showed that Cd, Pb, and As losses were caused mainly by sedimentation. The coverage of herbaceous plants accounted for more than 85% of the initial vegetation restored in the ecological buffer zones, and this was effective at reducing heavy metal diffusion. The losses of sediment, Cd, Pb, and As from surface runoff in November were 58%, 46%, 41%, and 40% lower, respectively, than those in July. The levels of soil erosion and heavy metal diffusion in the shrub/grass patterns were lower than those in patterns with a single plant type. PCA analysis showed that of the eight patterns, the Lolium perenne/Rhododendron simsii combination exhibited the lowest level of soil erosion and Cd, Pb, and As diffusion scores. The results indicated that shrub/grass ecological buffer patterns effectively reduced heavy metal diffusion in the riverbank near the mine. The construction of an L. perenne/R. simsii ecological buffer pattern is recommended as a pollutant control measure for riverbanks in catchments where Pb-Zn mine waste catchments. |
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