scholarly journals Phytoplankton communities determine the spatio-temporal heterogeneity of alkaline phosphatase activity: evidence from a tributary of the Three Gorges Reservoir

2016 ◽  
Author(s):  
Yijun Yuan ◽  
Yonghong Bi ◽  
Zhengyu Hu
Keyword(s):  
Alkaline Phosphatase ◽  
Water Temperature ◽  
Distribution Pattern ◽  
Alkaline Phosphatase Activity ◽  
Three Gorges Reservoir ◽  
Temporal Heterogeneity ◽  
Three Gorges ◽  
The Three Gorges ◽  
Phytoplankton Communities ◽  
Spatio Temporal

Abstract. In order to know the role of phytoplankton communities in the distribution pattern of alkaline phosphatase activity (APA), monthly investigation was conducted in the Xiaojiang River, a tributary of the Three Gorges Reservoir (TGR). Different APA fractions (APAT, APA 3.0 μm), environmental parameters, and phytoplankton communities were screened synchronously. Significant spatio-temporal differences of APA with the highest value in summer and the lowest in winter (P  3.0 μm were significantly higher than APA0.45–3 μm indicated phytoplankton was the main contributor to alkaline phosphatase. Correlation analysis indicated the dominant species and cell density could determine the distribution pattern of APA. Turbidity (Turb), total phosphorus (TP), chemical oxygen demand (COD), water temperature (WT), pH and chlorophyll a (Chl a) were proved to be positively correlated with APA; soluble reactive phosphorus (SRP), conductivity (Cond), transparency (SD) and water level (WL) were negatively correlated with APA. It was concluded that spatio-temporal heterogeneity of APA determined by phytoplankton communities was related to water temperature and hydrodynamics.

scholarly journals Characteristics of carbon source greenhouse gas flux in the water–air formation in the middle and upper reaches of the Three Gorges Reservoir

Water Policy ◽  
2021 ◽  
Author(s):  
Yu Qin ◽  
Zongtai Yu ◽  
Yujia Gou ◽  
Zhengmian Liu
Keyword(s):  
Partial Pressure ◽  
Water Temperature ◽  
Water Body ◽  
Three Gorges Reservoir ◽  
Diffusion Flux ◽  
Estimation Method ◽  
Three Gorges Reservoir Area ◽  
Three Gorges ◽  
The Three Gorges Reservoir ◽  
The Three Gorges

Abstract This study selected five points in the middle and upper mainstream of the Three Gorges Reservoir area. Starting from May 2016, the greenhouse gases CO2 and CH4 from the water–air formation at the sampling points have been monitored month by month for 10 months. Using the headspace balance method and the thin boundary layer model estimation method, we obtained the CO2 and CH4 partial pressure ranges and the water–air formation diffusion flux at the mainstream point. It is found that the CH4 partial pressure of water body is significantly positively correlated with water temperature, and significantly negatively correlated with DO; the CH2 partial pressure of water body is positively correlated with water temperature, but negatively correlated with conductivity, DO, pH and wind speed. The diffusion fluxes of CH4 and CO2 at the water–air formation are positively correlated with CH4 partial pressure and water temperature, and negatively correlated with ph, DO and conductivity. It is also found that the reservoir has a certain mitigation effect on the release of CO2 from the river water body, and the CH4 diffusion flux at the water–air formation is roughly equivalent.

scholarly journals Total Nitrogen Sources of the Three Gorges Reservoir — A Spatio-Temporal Approach

PLoS ONE ◽  
2015 ◽  
Vol 10 (10) ◽  
pp. e0141458 ◽  
Author(s):  
Chunping Ren ◽  
Lijing Wang ◽  
Binghui Zheng ◽  
Andreas Holbach
Keyword(s):  
Total Nitrogen ◽  
Three Gorges Reservoir ◽  
Nitrogen Sources ◽  
Three Gorges ◽  
The Three Gorges Reservoir ◽  
The Three Gorges ◽  
Spatio Temporal

Vertical Thermal Distribution at the near Dam Region of the Three Gorges Reservoir in the Initial Impoundment Period

2014 ◽  
Vol 889-890 ◽  
pp. 1649-1652
Author(s):  
L.Q. Dai ◽  
H.C. Dai ◽  
B.W. Wang
Keyword(s):  
Temperature Distribution ◽  
Water Temperature ◽  
Temperature Difference ◽  
Three Gorges Reservoir ◽  
Thermal Structure ◽  
Maximum Temperature ◽  
Three Gorges ◽  
Bottom Water Temperature ◽  
The Three Gorges Reservoir ◽  
The Three Gorges

Water temperature plays a crucial role in water ecological environment both in the reservoir and downstream area. Three Gorges Project (TGP) is the largest hydraulic engineering in the world, and changes of water quality attract much more attention, especially in the thermal structure since initial impoundment in 2003. In order to clearly understand water temperature distribution after the initial impoundment in the Three Gorges Reservoir (TGR), we monitored the temperature distribution of the Taipingxi section which was not far from the dam from early April to the end of July in 2004. According to the analyzing of the monitoring data of transverse and vertical temperature variation, we could find that when water level went up to 135m above sea level (a.s.l.) or 139m in the initial impoundment phase, the temperature mixed uniformly in transverse direction. Excepting April, there was basically had no temperature difference in vertical direction, even in April, the maximum temperature difference was only 1.39°C within 100 meters (April 22), the average temperature gradient was only 0.014°C/m; Both the temperature of water and atmosphere have similar variation tendency, but the response of the water temperature to atmosphere is delayed, especially the bottom water temperature. The result indicate that the reservoir displayed a mixed thermal structure during initial impoundment phase, therefore, the release had no change before and after impoundment, also had little influence on the aquatic organism and crops at downstream , the work provide a scientific basis for the development of pollution control and ecological protection measure.

scholarly journals Landscape Dynamics Improved Recreation Service of the Three Gorges Reservoir Area, China

2021 ◽  
Vol 18 (16) ◽  
pp. 8356
Author(s):  
Dengyue Zhao ◽  
Mingzhu Xiao ◽  
Chunbo Huang ◽  
Yuan Liang ◽  
Ziyue An
Keyword(s):  
Three Gorges Reservoir ◽  
Temporal Variations ◽  
Landscape Dynamics ◽  
Three Gorges Reservoir Area ◽  
Three Gorges ◽  
The Three Gorges ◽  
Vegetation Landscape ◽  
Recreation Service ◽  
Spatio Temporal ◽  
The Impact

Spatio-temporal variations of recreation service not only could help to understand the impact of cultural services on human well-being but also provides theoretical and technical support for regional landscape management. However, previous studies have avoided deeply quantifying and analyzing it or have simply focused on assessing recreational service at a single period in time. In this study, we used the InVEST model to evaluate the spatio-temporal variations of recreation service in the Three Gorges Reservoir Area and demonstrated the impact of recreation service on landscape dynamics. The results demonstrated that recreation service increased significantly and presented a significant spatial heterogeneity. Although afforestation and urban expansion both could significantly increase recreation service, the recreation service proxy of the non-vegetation landscape is far higher than that of the vegetation landscape. This finding indicated that human landscape is more attractive to tourists than the natural landscape, so we recommend to strengthen the infrastructure construction for enhancing the accessibility of natural landscapes. Moreover, we propose other constructive suggestions and landscape-design solutions for promoting recreation service. This study shifted the static environmental health assessment to the analysis of recreation service dynamics, bridging the regulatory mechanisms of ecosystem services involved in cultural services.

Sign in / Sign up

Export Citation Format

Share Document