Abstract
Abstract. The temporal effect of land use on streamwater quality needs to be addressed for a better understanding of the complex relationship between land use and streamwater quality. In this study, GIS and Pearson correlation analysis were used to determine whether there were correlations of land-use types with streamwater quality at the sub-basin scale in the Wei River basin, China, during dry and rainy seasons in 2012. Temporal variation of these relations was observed, indicating that relationships between water quality variables and proportions of different land uses were weaker in the rainy season than that in the dry season. Comparing with other land uses, agriculture and urban lands had a stronger relationship with water quality variables in both the rainy and dry seasons. These results suggest that the aspect of temporal effects should be taken into account for better land-use management.
Highlights
Water quality deterioration has been one of the key environmental issues in the world (Palmer et al 2004)
Bu (2014) employed statistical and spatial analysis to research the relationship between land-use patterns and river water quality in the Taizi River basin, China, during both dry and rainy seasons, indicating that during the dry season point source pollution was predominant, but in the rainy season water quality showed mixed pollution from both point and non-point sources
The results in this study suggested that forest land use was closely related to fewer water quality variables than any other land-use type in the rainy season according to the Pearson’s correlation analysis, and only a negative correlation between Cl- and forest land was found (r = –0.304)
Summary
Water quality deterioration has been one of the key environmental issues in the world (Palmer et al 2004). The linkage between land use and water quality in different scales were inconsistent (Johnson and Gage, 1997; Allen, 2004; Hurley, 2013; Bu et al, 2014; Ye et al, 2014). Dominant factors on the temporal scale, such as precipitation, temperature and agricultural activities, vary among seasons, and given their role on water chemistry, when non-point source pollution is predominant in the rainy season, agriculture and forest land show stronger association with water chemistry (Ye et al 2014). Researchers have suggested that it is necessary to take seasonal variation into consideration when studying the impact of land use on river water quality (Johnson, 1997). Researchers have suggested that it is necessary to take seasonal variation into consideration when studying the impact of land use on river water quality (Johnson, 1997). Bu (2014) employed statistical and spatial analysis to research the relationship between land-use patterns and river water quality in the Taizi River basin, China, during both dry and rainy seasons, indicating that during the dry season point source pollution was predominant, but in the rainy season water quality showed mixed pollution from both point and non-point sources
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