Spatial distribution and output characteristics of nonpoint source pollution in the Dongjiang River basin in south China

Rong, Qiangqiang; Su, Meirong; Yang, Zhenglun; Cai, Yanpeng; Yue, Wencong; Dang, Zhi

doi:10.1088/1755-1315/113/1/012145

Cited by 4 publications

(5 citation statements)

References 13 publications

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“…And the LUC changed areas have become the major contributor of soil erosion, especially the high‐intensity HAA (Figure 5). Although GTGP and NFCP have been taken to restore vegetation coverage, and intensive development strategy has been adopted to obtain sufficient living space and food (Chen et al, 2019), however, human activity (Rong et al, 2018; Zhang et al, 2000) have caused the destruction of vegetation cover (decreased by 13.36%) in high‐intensity HAA (Guo et al, 2018; Renard et al, 1991; Yang & Lu, 2018). Therefore, soil erosion increased in high‐intensity HAA (Figure 5).…”

Section: Discussionmentioning

confidence: 99%

“…The DRUB (E 113°45′–116°00′, N 23°00′–25°25′) belong to the Southeast China Coastal Hilly Regions, and are located at the east side of the Pearl River basin (Figure 1). It occupies 1,893,402.0 ha and is a key potable water source of Heyuan, Shenzhen, Guangzhou, and Hong Kong (Chen et al, 2019; Rong et al, 2018). Its climatic characteristics are similar to the northern regions of Southeast Asia with an annual average temperature of 20.4°C and the annual average rainfall is 1,529.6 mm (during 1951–2017) more than 80% of precipitation falls during the rainy season (see supporting information for more details, Figure S1).…”

Section: Methodsmentioning

confidence: 99%

“…Red earths, paddy soils, and lateritic red earths are the major soil type (Figure S2a) of this area. This area is dominated by hills (34.8%) and mountains (38.6%) (Rong et al, 2018), the average elevation and slope are 330.4 m (Figure 1) and 14.1 (Figure S2b), respectively. Most importantly, the study area is famous as 'the Kingdom of Rare Earth', and illegal mining leads to severe vegetation degradation (Xu et al, 1999;Zhu et al, 2015).…”

Section: Study Area Descriptionmentioning

confidence: 99%

“…Severe LUC changes caused by extensive mining and urbanization seriously threatens the eco‐environmental conditions in this area (Luo et al, 2014; Wu & Chen, 2013). Moreover, it is also one of the important drinking water sources for the Pearl River Delta regions (Chen et al, 2019; Rong et al, 2018). To clarify the effectiveness of GTGP and NFCP in alleviating soil erosion and protecting water sources, there is a critical need to study the impact of LUC changes on soil erosion variation.…”

Section: Introductionmentioning

confidence: 99%

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Long‐term land use/cover changes reduce soil erosion in an ionic rare‐earth mineral area of southern China

Huang

et al. 2021

Land Degrad Dev

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Ecological restoration projects, such as the Grain‐to‐Green Program (GTGP) and the Natural Forest Conservation Program (NFCP), have been implemented to improve vegetation cover since 1998. However, rapid urbanization has caused severe land use/cover (LUC) changes in the Dong River upstream basin. Therefore, it is urgent to study the long‐term (1999–2017) spatial–temporal variation of LUC and soil erosion since the implementation of GTGP and NFCP began in this area. Soil erosion and carbon sequestration were calculated using the revised universal soil loss equation (RUSLE) and C‐fix model. During 1999–2017, forest decreased by 28,857.81 ha and built‐up area increased by 17,193.01 ha. This area experienced severe LUC change, but vegetation cover has been effectively improved. When the observation period was measured in years, vegetation cover had a greater impact on decreasing soil erosion (554.11 × 104 t yr−1) than rainfall, while in months, the impact of rainfall is greater (causing a dramatically rebound of soil erosion in 2014). Furthermore, high‐intensity human activities made soil erosion increased by 37.70% in Yuancheng District, whereas soil organic carbon, total nitrogen, and total phosphorus loss decreased by 49.96, 33.03, and 44.44%, respectively. Moreover, GTGP and NFCP also bring collateral benefits, carbon sequestered by vegetation increased from 99.11 × 106 to 124.38 × 106 t CO2, during 1999–2014. And vegetation was the major factor of increased carbon sequestration, rather than temperature or solar radiation. These results elaborate on the impact of LUC changes on spatial–temporal variation of soil erosion. And it can provide a reference for the formulation of soil and water conservation measures in the future.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Study Area Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Long‐term land use/cover changes reduce soil erosion in an ionic rare‐earth mineral area of southern China

Huang

et al. 2021

Land Degrad Dev

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“…Located at the head of the Dongjiang River in southern China, Fengshuba Reservoir (FSBR) provides drinking water to nearly 40 million people in the surrounding cities of Longchuan, Shenzhen and Guangzhou., and can be used as a typical study of large water source reservoirs. With the rapid economic development of Dongjiang River Basin (Yanhu et al 2013), the FSBR may be polluted by nutrients, which will threaten the ecological environment and human health in the basin (Rong et al 2017). Hence, investigating the occurrence and morphology of nutrients in the FSBR is crucial.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive study of the occurrence and characteristics of carbon, nitrogen, and phosphorus in sediments and riparian soils of large drinking water reservoir

Cui

Chen

et al. 2022

Preprint

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The contamination of nutrients has caused considerable worry about the environment, resource value, and ecological worth of drinking water reservoirs. Therefore, we comprehensively studied the abundance, sources, distribution, and environmental behavior of carbon, nitrogen, and phosphorus in Fengshuba Reservoir (FSBR) (a large drinking reservoir, China). Seasonal hydrological circumstances had little influence on the nutrient abundance and structural component of the FSBR, while carbon, nitrogen, and phosphorus abundance, composition, and environmental behavior varied significantly between various environmental media (sediment and soil phases). Microbial-derived humus (C1), terrestrial-derived humus (C2), and protein-like tryptophan (C3) were identified as the three primary fluorescence components using parallel factor analysis. The abundance of colored dissolved organic matter (CDOM), molecular weight, aromatization degree, and humification degree of dissolved organic matter (DOM) in the sediment were lower than in the soil, whereas the authigenic component was greater than in the soil, according to spectral index analysis. The main sources of humus in FSBR were biogenic contributions. Principal component analysis indicated that three components were closely associated to phosphorus in the sediment phase, whereas nitrogen and phosphorus in the soil phase were mainly related to C1 and C2. In summary, in the management and control of water environment nutrients in reservoirs, soil media in the riparian zone must be carefully considered.

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Prediction of Total Phosphorus Based on Distance Correlation and Machine Learning Methods—a Case Study of Dongjiang River, China

Huang,

Chen

2024

Water Air Soil Pollut

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Spatial distribution and output characteristics of nonpoint source pollution in the Dongjiang River basin in south China

Cited by 4 publications

References 13 publications

Long‐term land use/cover changes reduce soil erosion in an ionic rare‐earth mineral area of southern China

Long‐term land use/cover changes reduce soil erosion in an ionic rare‐earth mineral area of southern China

Comprehensive study of the occurrence and characteristics of carbon, nitrogen, and phosphorus in sediments and riparian soils of large drinking water reservoir

Prediction of Total Phosphorus Based on Distance Correlation and Machine Learning Methods—a Case Study of Dongjiang River, China

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