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Seasonal-Spatial Distribution and Long-Term Variation of Transparency in Xin'anjiang Reservoir: Implications for Reservoir Management.

Wu Z, Zhang Y, Zhou Y, Liu M, Shi K, Yu Z - Int J Environ Res Public Health (2015)

Bottom Line: The seasonal effects were distinct, with lower values in the summer than in the winter, most likely due to river runoff and phytoplankton biomass increases.The transparency decreased significantly with a linear slope of 0.079 m/year, indicating a 2.05 m decrease and a marked decrease in water quality.A marked increase occurred in chlorophyll a (Chla) concentration, and a significant correlation was found between the transparency and Chla concentration, indicating that phytoplankton biomass can partially explain the long-term trend of transparency in Xin'anjiang Reservoir.

View Article: PubMed Central - PubMed

Affiliation: Chun'an Environmental Monitoring Station, Hangzhou 311700, China. caepb@126.com.

ABSTRACT
Water transparency is a useful indicator of water quality or productivity and is widely used to detect long-term changes in the water quality and eutrophication of lake ecosystems. Based on short-term spatial observations in the spring, summer, and winter and on long-term site-specific observation from 1988 to 2013, the spatial, seasonal, long-term variations, and the factors affecting transparency are presented for Xin'anjiang Reservoir (China). Spatially, transparency was high in the open water but low in the bays and the inflowing river mouths, reflecting the effect of river runoff. The seasonal effects were distinct, with lower values in the summer than in the winter, most likely due to river runoff and phytoplankton biomass increases. The transparency decreased significantly with a linear slope of 0.079 m/year, indicating a 2.05 m decrease and a marked decrease in water quality. A marked increase occurred in chlorophyll a (Chla) concentration, and a significant correlation was found between the transparency and Chla concentration, indicating that phytoplankton biomass can partially explain the long-term trend of transparency in Xin'anjiang Reservoir. The river input and phytoplankton biomass increase were associated with soil erosion and nutrient loss in the catchment. Our study will support future management of water quality in Xin'anjiang Reservoir.

No MeSH data available.


Related in: MedlinePlus

Boxplots of the monthly average rainfall in Xin’anjiang Reservoir for the long-term observations over the 26-year period (1988 to 2013) (a) and the chlorophyll a concentration (b) for the short-term observations from 2013 to 2014. The box is determined by the 25th and 75th percentiles, and the values of the median (horizontal line) and mean (diamond) are also included.
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ijerph-12-09492-f005: Boxplots of the monthly average rainfall in Xin’anjiang Reservoir for the long-term observations over the 26-year period (1988 to 2013) (a) and the chlorophyll a concentration (b) for the short-term observations from 2013 to 2014. The box is determined by the 25th and 75th percentiles, and the values of the median (horizontal line) and mean (diamond) are also included.

Mentions: To analyze the reasons for the seasonal variation in transparency, Figure 5 presents the seasonal characteristics of the monthly average rainfall amount over the 26-year period from 1988 to 2013 and the Chla concentration at 60 sites from 2013 to 2014 in Xin’anjiang Reservoir. The catchment monthly average rainfall amount was 81.9 ± 24.3 mm in winter, significantly lower than 174.1 ± 53.5 mm and 189.6 ± 75.5 mm in spring and summer, respectively, from 1988 to 2013 (Figure 5a) (one-way ANOVA, p < 0.001). The short-term spatial distribution observations at 60 sites showed that the Chla concentration was 2.67 ± 0.89 µg/L in the winter of 2013, significantly lower than the values of 8.88 ± 7.55 and 11.71 ± 3.86 µg/L in spring and summer, respectively, in 2014 (Figure 5b) (one-way ANOVA, p < 0.001).


Seasonal-Spatial Distribution and Long-Term Variation of Transparency in Xin'anjiang Reservoir: Implications for Reservoir Management.

Wu Z, Zhang Y, Zhou Y, Liu M, Shi K, Yu Z - Int J Environ Res Public Health (2015)

Boxplots of the monthly average rainfall in Xin’anjiang Reservoir for the long-term observations over the 26-year period (1988 to 2013) (a) and the chlorophyll a concentration (b) for the short-term observations from 2013 to 2014. The box is determined by the 25th and 75th percentiles, and the values of the median (horizontal line) and mean (diamond) are also included.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4555293&req=5

ijerph-12-09492-f005: Boxplots of the monthly average rainfall in Xin’anjiang Reservoir for the long-term observations over the 26-year period (1988 to 2013) (a) and the chlorophyll a concentration (b) for the short-term observations from 2013 to 2014. The box is determined by the 25th and 75th percentiles, and the values of the median (horizontal line) and mean (diamond) are also included.
Mentions: To analyze the reasons for the seasonal variation in transparency, Figure 5 presents the seasonal characteristics of the monthly average rainfall amount over the 26-year period from 1988 to 2013 and the Chla concentration at 60 sites from 2013 to 2014 in Xin’anjiang Reservoir. The catchment monthly average rainfall amount was 81.9 ± 24.3 mm in winter, significantly lower than 174.1 ± 53.5 mm and 189.6 ± 75.5 mm in spring and summer, respectively, from 1988 to 2013 (Figure 5a) (one-way ANOVA, p < 0.001). The short-term spatial distribution observations at 60 sites showed that the Chla concentration was 2.67 ± 0.89 µg/L in the winter of 2013, significantly lower than the values of 8.88 ± 7.55 and 11.71 ± 3.86 µg/L in spring and summer, respectively, in 2014 (Figure 5b) (one-way ANOVA, p < 0.001).

Bottom Line: The seasonal effects were distinct, with lower values in the summer than in the winter, most likely due to river runoff and phytoplankton biomass increases.The transparency decreased significantly with a linear slope of 0.079 m/year, indicating a 2.05 m decrease and a marked decrease in water quality.A marked increase occurred in chlorophyll a (Chla) concentration, and a significant correlation was found between the transparency and Chla concentration, indicating that phytoplankton biomass can partially explain the long-term trend of transparency in Xin'anjiang Reservoir.

View Article: PubMed Central - PubMed

Affiliation: Chun'an Environmental Monitoring Station, Hangzhou 311700, China. caepb@126.com.

ABSTRACT
Water transparency is a useful indicator of water quality or productivity and is widely used to detect long-term changes in the water quality and eutrophication of lake ecosystems. Based on short-term spatial observations in the spring, summer, and winter and on long-term site-specific observation from 1988 to 2013, the spatial, seasonal, long-term variations, and the factors affecting transparency are presented for Xin'anjiang Reservoir (China). Spatially, transparency was high in the open water but low in the bays and the inflowing river mouths, reflecting the effect of river runoff. The seasonal effects were distinct, with lower values in the summer than in the winter, most likely due to river runoff and phytoplankton biomass increases. The transparency decreased significantly with a linear slope of 0.079 m/year, indicating a 2.05 m decrease and a marked decrease in water quality. A marked increase occurred in chlorophyll a (Chla) concentration, and a significant correlation was found between the transparency and Chla concentration, indicating that phytoplankton biomass can partially explain the long-term trend of transparency in Xin'anjiang Reservoir. The river input and phytoplankton biomass increase were associated with soil erosion and nutrient loss in the catchment. Our study will support future management of water quality in Xin'anjiang Reservoir.

No MeSH data available.


Related in: MedlinePlus