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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 for the total nitrogen (a), (b) and chlorophyll a (c), (d) concentrations at Daba in April, July, and December and at Hangtoudao in July in Xin’anjiang Reservoir from 2001 to 2013.
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ijerph-12-09492-f007: Long-term trends for the total nitrogen (a), (b) and chlorophyll a (c), (d) concentrations at Daba in April, July, and December and at Hangtoudao in July in Xin’anjiang Reservoir from 2001 to 2013.

Mentions: To discuss whether reservoir eutrophication and phytoplankton biomass could explain the long-term variation in transparency, we presented the long-term trends of the TN and Chla concentrations from 2001 to 2013 (Figure 7). The TN concentration markedly increased at Daba in April, July and December (Figure 7a,b) but had almost no change at Hangtoudao in July (Figure 7b). Meanwhile, the Chla concentration markedly increased at Daba in April, July and December and at Hangtoudao in July (Figure 7c,d). However, none of these linearly increasing trends were statistically significant (p > 0.05) (Figure 7). The long-term trends of the TN and Chla concentrations contrasted with those of transparency, which partially explains the decrease in transparency.


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 for the total nitrogen (a), (b) and chlorophyll a (c), (d) concentrations at Daba in April, July, and December and at Hangtoudao in July in Xin’anjiang Reservoir from 2001 to 2013.
© Copyright Policy
Related In: Results  -  Collection

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

ijerph-12-09492-f007: Long-term trends for the total nitrogen (a), (b) and chlorophyll a (c), (d) concentrations at Daba in April, July, and December and at Hangtoudao in July in Xin’anjiang Reservoir from 2001 to 2013.
Mentions: To discuss whether reservoir eutrophication and phytoplankton biomass could explain the long-term variation in transparency, we presented the long-term trends of the TN and Chla concentrations from 2001 to 2013 (Figure 7). The TN concentration markedly increased at Daba in April, July and December (Figure 7a,b) but had almost no change at Hangtoudao in July (Figure 7b). Meanwhile, the Chla concentration markedly increased at Daba in April, July and December and at Hangtoudao in July (Figure 7c,d). However, none of these linearly increasing trends were statistically significant (p > 0.05) (Figure 7). The long-term trends of the TN and Chla concentrations contrasted with those of transparency, which partially explains the decrease in transparency.

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