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Coupled effects of natural and anthropogenic controls on seasonal and spatial variations of river water quality during baseflow in a coastal watershed of Southeast China

Huang, Jinliang ; Huang, Yaling ; Zhang, Zhenyu Chapman, Maura (Gee) Geraldine

PloS one, 2014-03, Vol.9 (3), p.e91528 [Periódico revisado por pares]

United States: Public Library of Science

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  • Título:
    Coupled effects of natural and anthropogenic controls on seasonal and spatial variations of river water quality during baseflow in a coastal watershed of Southeast China
  • Autor: Huang, Jinliang ; Huang, Yaling ; Zhang, Zhenyu
  • Chapman, Maura (Gee) Geraldine
  • Assuntos: Agricultural watersheds ; Analysis ; Aquatic resources ; Biology ; Chemistry ; China ; Coastal water quality ; Dry season ; Earth Sciences ; Environmental Monitoring ; Floods ; Fresh Water ; Geography ; Management ; Pollution ; Precipitation (Meteorology) ; Regression analysis ; River water quality ; Rivers ; Seasonal variations ; Seasons ; Spatial Analysis ; Spatial variability ; Spatio-Temporal Analysis ; Statistical methods ; Surface runoff ; Surface water ; Wastewater ; Water ; Water Pollutants, Chemical ; Water pollution ; Water Quality ; Water resource management ; Water resources ; Water resources and agriculture ; Water resources management ; Water sampling ; Weathering
  • É parte de: PloS one, 2014-03, Vol.9 (3), p.e91528
  • Notas: Competing Interests: The authors have declared that no competing interests exist.
    Conceived and designed the experiments: JlH YlH ZyZ. Performed the experiments: YlH ZyZ. Analyzed the data: JlH YlH. Contributed reagents/materials/analysis tools: JlH YlH. Wrote the paper: JlH YlH.
  • Descrição: Surface water samples of baseflow were collected from 20 headwater sub-watersheds which were classified into three types of watersheds (natural, urban and agricultural) in the flood, dry and transition seasons during three consecutive years (2010-2012) within a coastal watershed of Southeast China. Integrating spatial statistics with multivariate statistical techniques, river water quality variations and their interactions with natural and anthropogenic controls were examined to identify the causal factors and underlying mechanisms governing spatiotemporal patterns of water quality. Anthropogenic input related to industrial effluents and domestic wastewater, agricultural activities associated with the precipitation-induced surface runoff, and natural weathering process were identified as the potential important factors to drive the seasonal variations in stream water quality for the transition, flood and dry seasons, respectively. All water quality indicators except SRP had the highest mean concentrations in the dry and transition seasons. Anthropogenic activities and watershed characteristics led to the spatial variations in stream water quality in three types of watersheds. Concentrations of NH(4)(+)-N, SRP, K(+), COD(Mn), and Cl- were generally highest in urban watersheds. NO3(-)N Concentration was generally highest in agricultural watersheds. Mg(2+) concentration in natural watersheds was significantly higher than that in agricultural watersheds. Spatial autocorrelations analysis showed similar levels of water pollution between the neighboring sub-watersheds exhibited in the dry and transition seasons while non-point source pollution contributed to the significant variations in water quality between neighboring sub-watersheds. Spatial regression analysis showed anthropogenic controls played critical roles in variations of water quality in the JRW. Management implications were further discussed for water resource management. This research demonstrates that the coupled effects of natural and anthropogenic controls involved in watershed processes, contribute to the seasonal and spatial variation of headwater stream water quality in a coastal watershed with high spatial variability and intensive anthropogenic activities.
  • Editor: United States: Public Library of Science
  • Idioma: Inglês
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