Mineral-leaching chemical transport with runoff and sediment from severely eroded rare-earth tailings in southern China

Lu, Hui-Zhong; Cao, Longxi; Liang, Yin; Yuan, Jinghe; Zhu, Yayun; Wang, Yi; Gu, Yalan; Zhao, Qian

doi:10.5194/se-8-845-2017

Cited by 13 publications

(3 citation statements)

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“…The relatively enriched rare-earth elements are contained in the lateritic ion-adsorption clay deposits in south China, and have been extracted since the 1970s. The long-term extraction of these rare-earth elements has caused lasting environmental damages, erosion of tailings, and contamination (Kynicky et al, 2012), and will continue to lead to new erosion of tailings in the future (Lu et al, 2017).…”

Section: Main Issues and Challenges In The Swc Of This Regionmentioning

confidence: 99%

Regions and Their Typical Paradigms for Soil and Water Conservation in China

et al. 2020

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China is experiencing conflicts between its large population and scarce arable land, and between a demand for high productivity and the severe soil erosion of arable land. Since 1949, China has committed to soil and water conservation (SWC), for which eight regions and 41 subregions have been developed to improve the environment and increase land productivity. To obtain information from the regional planning and strategies for SWC and to explore whether SWC practices simultaneously contribute to soil conservation, ecosystem functioning, and the livelihoods of local farmers, and to summarize the successful experiences of various SWC paradigms with distinct characteristics and mechanisms of soil erosion, this paper systematically presents seven SWC regions (excluding the Tibetan Plateau region) and 14 typical SWC paradigms, focusing on erosion mechanisms and the key challenges or issues in the seven regions as well as on the core problems, main objectives, key technologies, and the performance of the 14 typical paradigms. In summary, the 14 typical SWC paradigms successfully prevent and control local soil erosion, and have largely enhanced, or at least do not harm, the livelihoods of local farmers. However, there remain many challenges and issues on SWC and socioeconomic development that need to be addressed in the seven SWC regions. China, thus, still has a long way to go in successfully gaining the win-win objective of SWC and human aspects of development.

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Section: Main Issues and Challenges In The Swc Of This Regionmentioning

confidence: 99%

Regions and Their Typical Paradigms for Soil and Water Conservation in China

et al. 2020

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“…Este pode ser considerado um dos problemas ambientais na bacia hidrográfi ca em estudo, em grande parte derivado sobretudo dos incêndios fl orestais, por destruírem por completo o coberto vegetal em grandes extensões e favorecerem a perda de solo por erosão hídrica, ou mesmo o arrastamento de minerais dissolvidos na água na água do escoamento superfi cial (Meneses and Cortez, 2015). Outra evidência da interferência das alterações de uso e ocupação do solo na qualidade da água é o aumento tendencial de concentração de minerais dissolvidos na água de Castelo de Bode (Figura 13), estando este aumento dependente da quantidade de precipitação que cai sobre as vertentes (período chuvoso entre setembro e fevereiro), fator que pode explicar também o maior ou menor arrastamento de sedimentos das vertentes e sua concentração nos corpos de água (Lu et al, 2017;. A área ardida resultante dos incêndios fl orestais que ocorrem na bacia hidrográfi ca entre 1990 e 2012 também se refl ete no aumento da concentração de minerais dissolvidos na água desta barragem.…”

Section: Alterações Do Uso E Ocupação Do Solounclassified

Alterações De Uso E Ocupação Do Solo Na Bacia Hidrográfica Do Rio Zêzere (Portugal): Implicações Hidrodinâmicas

Meneses

2020

Rev. Bras. Geomorfol.

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Nesta investigação apresenta-se a avaliação da influência das alterações do uso e ocupação do solo na dinâmica hidrológica da bacia hidrográfica do Rio Zêzere, localizada na região centro de Portugal. A metodologia adotada para a obtenção dos índices topográfico de encharcamento, potencia de escoamento e produção de sedimentos e a sua modificação em função da integração do uso e ocupação do solo é explicada. Apresentam-se os resultados obtidos destes índices, evidenciando-se as alterações espaciais em função das alterações de uso e ocupação do solo. Na análise integrou-se dados complementares (condutividade elétrica da água numa barragem) para calcular a variação da produção de sedimentos. Os resultados apresentados demonstram haver influência do uso e ocupação do solo na dinâmica fluvial da bacia hidrográfica do Rio Zêzere, nomeadamente na produção de sedimentos.

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“…Agricultural activities are responsible for the greatest ecological damage that humans have created in Hunan Province, with decreases in ecological areas of 229.82 km 2 and 132.12 km 2 , respectively, during 2000–2010 [ 1 ]. Rapid development in urban areas has turned Hunan into one of the provinces that has undergone relatively serious soil and water losses in southern China [ 2 ]. It is well known that there are abundant reserves of non-ferrous metals in Hunan Province [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Land Use Changes Influence the Soil Enzymatic Activity and Nutrient Status in the Polluted Taojia River Basin in Sub-Tropical China

Yuan

Liang

et al. 2022

IJERPH

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Different land use practices may improve soil quality or lead to soil deterioration. Recently, environmental problems, such as heavy pollution and soil erosion, have led to serious land degradation in the Taojia River basin. In this study, we explored the soil fertility characteristics (mechanical composition; pH; soil organic matter (SOM); soil total nitrogen (TN); and the activity of four enzymes, i.e., urease, hydrogen peroxide, alkaline phosphatase, and sucrose enzymes) under different types of land use in the Taojia River basin. Soil samples were taken from 0–10 cm, 10–20 cm, and 20–40 cm depths from four different land use types that were widely used in the Taojia river basin, including cultivated land, vegetable fields, woodlands, and wastelands. The results showed that the soil enzyme activity and the constituents of the soil were closely related and significantly affected each other (p < 0.05). Woodland soil exhibited the highest content of SOM in all soil depths. Soil total nitrogen mainly depended on the accumulation of biomass and the decomposition intensity of organic matter, so the changes in TN followed the trends of the changes in SOM. Woodland soil showed an improved mechanical composition. We were also able to observe an increased clay content in woodland soil. Woodland soil also exhibited the reversal of soil desertification and an increase in nutrient/water retention capacity. Therefore, an increase in woodland areas would be an appropriate goal in terms of land use in order to improve the eco-environmental quality of the Taojia River basin.

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Mineral-leaching chemical transport with runoff and sediment from severely eroded rare-earth tailings in southern China

Cited by 13 publications

References 50 publications

Regions and Their Typical Paradigms for Soil and Water Conservation in China

Regions and Their Typical Paradigms for Soil and Water Conservation in China

Alterações De Uso E Ocupação Do Solo Na Bacia Hidrográfica Do Rio Zêzere (Portugal): Implicações Hidrodinâmicas

Land Use Changes Influence the Soil Enzymatic Activity and Nutrient Status in the Polluted Taojia River Basin in Sub-Tropical China

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