scholarly journals Water fluxes in the groundwater-soil-plant-atmosphere continuum and water sources of typical wetland vegetation communities in Poyang Lake

2018 ◽  
Vol 30 (5) ◽  
pp. 1351-1367
Author(s):  
XU Xiuli ◽  
◽  
LI Yunliang ◽  
TAN Zhiqiang ◽  
ZHANG Qi
Keyword(s):  
Poyang Lake ◽  
Water Sources ◽  
Wetland Vegetation ◽  
Water Fluxes ◽  
Vegetation Communities

scholarly journals A study of the relationship between wetland vegetation communities and water regimes using a combined remote sensing and hydraulic modeling approach

2016 ◽  
Vol 47 (S1) ◽  
pp. 278-292 ◽  
Author(s):  
Tan Zhiqiang ◽  
Zhang Qi ◽  
Li Mengfan ◽  
Li Yunliang ◽  
Xu Xiuli ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Poyang Lake ◽  
Spatial Scales ◽  
Hydraulic Modeling ◽  
Wetland Vegetation ◽  
Vegetation Distribution ◽  
Vegetation Communities ◽  
Water Regimes ◽  
Hydrological Conditions ◽  
Hydrologic Condition

Hydrologic condition is a major driving force for wetland ecosystems. The influence of water regimes on vegetation distribution is of growing interest as wetlands are increasingly disturbed by climate change and intensive human activities. However, at large spatial scales, the linkage between water regimes and vegetation distribution remains poorly understood. In this study, vegetation communities in Poyang Lake wetland were classified from remote sensing imagery. Water regimes characterized by inundation duration (IDU), inundation depth (IDE), and inundation frequency were simulated using physics-based hydraulic models and were then linked with vegetation communities by a Gaussian regression model. The results showed that the Carex community was found to favor more hydrologic environments with longer IDU and deeper IDE in comparison to the Phragmites community. In addition, we found that the Carex community could survive in a relatively wider variety of hydrological conditions than the Phragmites community. For the typical sub-wetlands of the Poyang Lake National Nature Reserve (PLNNR), only the influence of IDU on the distribution of vegetation communities was significant. Outcomes of this research extend our knowledge of the dependence of wetland vegetation on hydrological conditions at larger spatial scales. The results provide practical information for ecosystem management.

scholarly journals Modeling the Spatial Distribution of Three Typical Dominant Wetland Vegetation Species’ Response to the Hydrological Gradient in a Ramsar Wetland, Honghe National Nature Reserve, Northeast China

Water ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 2041
Author(s):  
Dandan Yan ◽  
Zhaoqing Luan ◽  
Dandan Xu ◽  
Yuanyuan Xue ◽  
Dan Shi
Keyword(s):  
Spatial Distribution ◽  
Water Level ◽  
Northeast China ◽  
Nature Reserve ◽  
Wetland Vegetation ◽  
Vegetation Communities ◽  
National Nature Reserve ◽  
Carex Lasiocarpa ◽  
Vegetation Species ◽  
Calamagrostis Angustifolia

Water level fluctuations resulting from natural and anthropogenic factors have been projected to affect the functions and structures of wetland vegetation communities. Therefore, it is important to assess the impact of the hydrological gradient on wetland vegetation. This paper presents a case study on the Honghe National Nature Reserve (HNNR) in the Sanjiang Plain, located in Northeast China. In this study, 210 plots from 18 sampling line transects were sampled in 2011, 2012, and 2014 along the hydrological gradient. Using a Gaussian logistic regression model, we determined a relationship between three wetland plant species and a hydrologic indicator—a combination of the water level and soil moisture—and then applied that relationship to simulate the distribution of plants across a larger landscape by the geographic information system (GIS). The results show that the optimum ecological amplitude of Calamagrostis angustifolia to the hydrological gradient based on the probability of occurrence model was [0.09, 0.41], that of Carex lasiocarpa was [0.35, 0.57], and that of Carex pseudocuraica was [0.49, 0.77]. The optimum of Calamagrostis angustifolia was 0.25, Carex lasiocarpa was 0.46, and Carex pseudocuraica was 0.63. Spatial distribution probability maps were generated, as were maps detailing the distribution of the most suitable habitats for wetland vegetation species. Finally, the model simulation results were verified, showing that this approach can be employed to provide an accurate simulation of the spatial distribution pattern of wetland vegetation communities. Importantly, this study suggests that it may be possible to predict the spatial distribution of different species from the hydrological gradient.

Microbial Community Analysis of Underground Drinking Water Using Denaturing Gradient Gel Electrophoresis and Flow Cytometry Technologies

2014 ◽  
Vol 700 ◽  
pp. 519-524 ◽  
Author(s):  
Jie Liu ◽  
Yan Li Ding ◽  
Mark Bartlam ◽  
Ying Ying Wang
Keyword(s):  
Drinking Water ◽  
Microbial Community ◽  
Rural Areas ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Poyang Lake ◽  
Removal Rate ◽  
Underground Water ◽  
Water Sources ◽  
Gradient Gel Electrophoresis ◽  
Bacteria And Fungi

Underground water is directly used as drinking water in most rural areas of developing countries due to limitations in infrastructure. As an important indicator of drinking water quality, however, microbial quality has been largely ignored for a long time. Microbial quality poses a great threat to the safety of underground drinking water, especially in rural areas. The current study compared microbial abundance and community structure of three different water sources, i.e. underground water, Poyang Lake and Hai River, combined with flow cytometry (FCM) and denaturing gradient gel electrophoresis (DGGE). FCM results showed that the bacterial concentration of underground water is the lowest (1.037×106cell/ml) of the three water sources, but still approximates that of the Poyang Lake. The removal rate of bacteria after filtration through a 0.45μm-pore-size filter is 98.16% in underground water. The removal rate for Poyang Lake and Hai River is much lower (i.e. 66.57% and 74.17% respectively). DGGE profiles demonstrated that the microbial community structure in underground water shares higher similarity to Poyang Lake (51.0% and 53.1% similarity for bacteria and fungi respectively) than Hai River. The microbial diversity index (i.e. Shannon-Weaver index) for bacteria and fungi are 2.906 and 2.847 respectively in underground water, which is lower than in Poyang Lake. The evenness (i.e. Simpson index) of groundwater was lowest among the three water sources tested. The results suggested that groundwater has a complex microbial community and hence it is critical to apply necessary hygienic barriers to remove microbes for the safety of underground drinking water.

Use of Unmanned Aircraft Systems to Delineate Fine-Scale Wetland Vegetation Communities

Wetlands ◽  
2015 ◽  
Vol 35 (2) ◽  
pp. 303-309 ◽  
Author(s):  
Christa L. Zweig ◽  
Matthew A. Burgess ◽  
H. Franklin Percival ◽  
Wiley M. Kitchens
Keyword(s):  
Wetland Vegetation ◽  
Unmanned Aircraft ◽  
Unmanned Aircraft Systems ◽  
Fine Scale ◽  
Vegetation Communities ◽  
Aircraft Systems

scholarly journals Responses of wetland vegetation to droughts and its impact factors in Poyang Lake National Nature Reserve

2014 ◽  
Vol 26 (2) ◽  
pp. 253-259 ◽  
Author(s):  
YE Chun ◽  
◽  
WU Guiping ◽  
ZHAO Xiaosong ◽  
WANG Xiaolong ◽  
...  
Keyword(s):  
Nature Reserve ◽  
Poyang Lake ◽  
Wetland Vegetation ◽  
Impact Factors ◽  
National Nature Reserve
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