Spatial and Temporal Variations of Eutrophication in Poyang Lake

2020 ◽  
Author(s):  
aiping huang
Keyword(s):  
Chlorophyll A ◽  
Poyang Lake ◽  
High Water ◽  
Temporal Variations ◽  
Spatial And Temporal Variations ◽  
Nutrient Concentrations ◽  
Observation Data ◽  
Chlorophyll A Concentration ◽  
High Water Period ◽  
Field Observation Data

<p>Lake eutrophication is a key point in water environmental problems in the world. Spatiotemporal variations of nutrients and chlorophyll-a and eutrophication index in Poyang Lake, the largest freshwater lake in China, are analyzed in this paper basing on field observation data at 17 sampling points from 2011 to 2016. The results show that nutrient concentrations have obvious seasonality characteristics and present bigger values in the low water period than the high water period. The peak value of chlorophyll-a concentration appears in July and October respectively. As a whole, the eutrophication index in the low water period is higher than the high water period, and the maximum value is found in October which mainly due to the high chlorophyll-a concentration. Poyang Lake is at light eutrophication level from 2011 to 2012, and mesotrophic from 2013 to 2016. From the perspective of space, nutrient concentrations in the southern part of the lake is higher than the northern part in general, and chlorophyll-a and eutrophication index show the similar law. This paper makes a quantitative analysis for spatial and temporal variations of eutrophication which benefit the water management especially water pollution control in Poyang Lake</p>

scholarly journals Spatial and temporal variations of chlorophyll-a concentration from 2009 to 2012 in Poyang Lake, China

2014 ◽  
Vol 73 (8) ◽  
pp. 4063-4075 ◽  
Author(s):  
Juanle Wang ◽  
Yongjie Zhang ◽  
Fei Yang ◽  
Xiaoming Cao ◽  
Zhongqiang Bai ◽  
...  
Keyword(s):  
Chlorophyll A ◽  
Poyang Lake ◽  
Temporal Variations ◽  
Spatial And Temporal Variations ◽  
Chlorophyll A Concentration

scholarly journals Seasonal and Diurnal Variations in the Priestley–Taylor Coefficient for a Large Ephemeral Lake

Water ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 849 ◽  
Author(s):  
Guojing Gan ◽  
Yuanbo Liu ◽  
Xin Pan ◽  
Xiaosong Zhao ◽  
Mei Li ◽  
...  
Keyword(s):  
Poyang Lake ◽  
High Water ◽  
Diurnal Variations ◽  
Observation Data ◽  
Available Energy ◽  
Diurnal Patterns ◽  
Ephemeral Lakes ◽  
Seasonal And Diurnal Variations ◽  
Daily Scale ◽  
Mean Square Errors

The Priestley–Taylor equation (PTE) is widely used with its sole parameter (α) set as 1.26 for estimating the evapotranspiration (ET) of water bodies. However, variations in α may be large for ephemeral lakes. Poyang Lake, which is the largest freshwater lake in China, is water-covered and wetland-covered during its high-water and low-water periods, respectively, over a year. This paper examines the seasonal and diurnal variations in α using eddy covariance observation data for Poyang Lake. The results show that α = 1.26 is overall feasible for both periods at daily and subdaily scales. No obvious seasonal trend was observed, although the standard deviation in α for the wetland was larger than that for the water surface. The mean bias in evaporation estimations using the PTE was less than 5 W·m−2 during both periods, and the root mean square errors were much smaller than the average evaporation measurements at daily scale. U-shaped diurnal patterns of α were found during both periods, due partly to the negative correlation between α and the available energy (A). Compared to the vapor pressure deficit (VPD), wind speed (u) exerts a larger contribution to these variations. In addition, u is positively correlated with α during both periods, however, VPD was positively and negatively correlated with α during the high-water and low-water periods, respectively. Subdaily α exhibited contrasting clusters in the (u, VPD) plane under the same available energy ranges. Our study highlights the seasonal and diurnal course of α and suggests the careful use of PTE at subdaily scales.

Spatial and temporal variations in nutrient and chlorophyll-a concentrations in the northern East China Sea surrounding Cheju Island

2009 ◽  
Vol 29 (11-12) ◽  
pp. 1426-1436 ◽  
Author(s):  
Dongseon Kim ◽  
Sang Hwa Choi ◽  
Kyung Hee Kim ◽  
JeongHee Shim ◽  
Sinjae Yoo ◽  
...  
Keyword(s):  
Chlorophyll A ◽  
East China Sea ◽  
Temporal Variations ◽  
Spatial And Temporal Variations ◽  
East China ◽  
China Sea ◽  
Cheju Island

scholarly journals Seasonal and Tidal Dynamics of Nutrients and Chlorophyll a Concentration in Water at the Sundarbans Mangrove Ecosystems of Bangladesh

2020 ◽  
Vol 3 (1) ◽  
pp. 50-67
Author(s):  
Md. Sakib Hasan Nion ◽  
Md. Sirajul Islam ◽  
Md. Enamul Hoq ◽  
Md. Humayun Kabir ◽  
Mir Md. Mozammal Hoque
Keyword(s):  
Water Quality ◽  
Chlorophyll A ◽  
High Tide ◽  
Nutrient Concentrations ◽  
Chlorophyll A Concentration ◽  
Post Monsoon ◽  
Mangrove Ecosystems ◽  
Very High ◽  
Sundarbans Mangrove ◽  
The Sundarbans

The seasonal and tidal variations of physicochemical parameters, nutrient concentrations and chlorophyll a concentration from the water of Passur river and Koromjol canal in the Sundarbans mangrove ecosystems were investigated during March 2018 to February 2019. Samples were collected from five sampling stations during March, August and November where these months were considered as pre-monsoon, monsoon and post-monsoon seasons, respectively. The nutrients NH3-N, NO3-N, PO4-P, SO4 and Chlorophyll a concentrations were found 0.001 to 0.09, 3.5 to 50, 0.06 to 5.4, 30 to 272 and 0.18 to 1.75 mg/L, respectively, during high tides, and 0.001 to 0.39, 4.2 to 47, 0.1 to 2.75, 20 to 179 and 0.218 to 1.88 mg/L, respectively, during low tides. The NO3-N was very high than suitable limit during both tides at monsoon and post-monsoon season. The PO4-P was found moderately high during both tides at all stations. The SO4 was found to be 187.8 and 76.87 mg/L during high tide, and 135.4 and 95.73 mg/L during low tides in pre-monsoon and post-monsoon, respectively, that were very high than water quality standards. The Passur river and the Koromjol canal were fluctuating seasonally and tidally in some magnitude and their variations can alter the water quality as well as the density and distribution of living organisms.

Assessment of spatial and temporal variations of high water mark indicators

2013 ◽  
Vol 85 ◽  
pp. 77-89 ◽  
Author(s):  
Xin Liu ◽  
Jianhong (Cecilia) Xia ◽  
Michael Kuhn ◽  
Graeme Wright ◽  
Lesley Arnold
Keyword(s):  
High Water ◽  
Temporal Variations ◽  
Spatial And Temporal Variations ◽  
High Water Mark
Sign in / Sign up

Export Citation Format

Share Document