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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

Long-term trends of transparency at Daba in April (a), July (b), and December (c) and at Hangtoudao in July (d) in Xin’anjiang Reservoir from 1988 to 2013.
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ijerph-12-09492-f006: Long-term trends of transparency at Daba in April (a), July (b), and December (c) and at Hangtoudao in July (d) in Xin’anjiang Reservoir from 1988 to 2013.

Mentions: The long-term trends of transparency in the last 26 years (1988–2013) at Daba in April, July, and December and at Hangtoudao in July in Xin’anjiang Reservoir are shown in Figure 6. The long-term monitoring data for transparency showed that significant changes had occurred in the underwater light environment of Xin’anjiang Reservoir. During these 26 years, a significant decrease (p < 0.05) in transparency occurred at Daba in April and July (Figure 6a,b) and at Hangtoudao in July (Figure 6d). However, no significant decrease was found at Daba in December (Figure 6c). The decreased rate, as shown by the slope of the line, varied considerably among the different sites and seasons, with the greatest decrease in transparency at 1.38 m per decade, which was based on the linear fitting as recorded at Daba in April (Figure 6a). When all three seasons were considered together at Daba, the mean decrease in transparency was 0.79 m per decade, which was statistically significant (r2 = 0.28, p ≤ 0.005), indicating a 2.05 m decrease in water transparency in the past 26 years.


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)

Long-term trends of transparency at Daba in April (a), July (b), and December (c) and at Hangtoudao in July (d) in Xin’anjiang Reservoir from 1988 to 2013.
© Copyright Policy
Related In: Results  -  Collection

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

ijerph-12-09492-f006: Long-term trends of transparency at Daba in April (a), July (b), and December (c) and at Hangtoudao in July (d) in Xin’anjiang Reservoir from 1988 to 2013.
Mentions: The long-term trends of transparency in the last 26 years (1988–2013) at Daba in April, July, and December and at Hangtoudao in July in Xin’anjiang Reservoir are shown in Figure 6. The long-term monitoring data for transparency showed that significant changes had occurred in the underwater light environment of Xin’anjiang Reservoir. During these 26 years, a significant decrease (p < 0.05) in transparency occurred at Daba in April and July (Figure 6a,b) and at Hangtoudao in July (Figure 6d). However, no significant decrease was found at Daba in December (Figure 6c). The decreased rate, as shown by the slope of the line, varied considerably among the different sites and seasons, with the greatest decrease in transparency at 1.38 m per decade, which was based on the linear fitting as recorded at Daba in April (Figure 6a). When all three seasons were considered together at Daba, the mean decrease in transparency was 0.79 m per decade, which was statistically significant (r2 = 0.28, p ≤ 0.005), indicating a 2.05 m decrease in water transparency in the past 26 years.

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