scholarly journals Effect of hydrological variation on vegetation dynamics for wintering waterfowl in China’s Poyang Lake Wetland

2020 ◽  
Vol 22 ◽  
pp. e01020 ◽  
Author(s):  
Mengying Yang ◽  
Shaoxia Xia ◽  
Guihua Liu ◽  
Min Wang ◽  
Zhi Ding ◽  
...  
Keyword(s):  
Vegetation Dynamics ◽  
Poyang Lake ◽  
Wintering Waterfowl ◽  
Hydrological Variation ◽  
Poyang Lake Wetland

scholarly journals Hydrological Condition Constrains Vegetation Dynamics for Wintering Waterfowl in China’s East Dongting Lake Wetland

2019 ◽  
Vol 11 (18) ◽  
pp. 4936 ◽  
Author(s):  
Min Wang ◽  
Qing Gu ◽  
Guihua Liu ◽  
Jingwei Shen ◽  
Xuguang Tang
Keyword(s):  
Vegetation Dynamics ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Temporal Dynamics ◽  
Global Climate ◽  
Dongting Lake ◽  
Plant Resources ◽  
Data Set ◽  
Wintering Waterfowl ◽  
The Government

As an internationally important wintering region for waterfowls on the East Asian–Australasian Flyway, the national reserve of China’s East Dongting Lake wetland is abundant in animal and plant resources during winter. The hydrological regimes, as well as vegetation dynamics, in the wetland have experienced substantial changes due to global climate change and anthropogenic disturbances, such as the construction of hydroelectric dams. However, few studies have investigated how the wetland vegetation has changed over time, particularly during the wintering season, and how this has directly affected habitat suitability for migratory waterfowl. Thus, it is necessary to monitor the spatio-temporal dynamics of vegetation in the protected wetland and explore the potential factors that alter it. In this study, the data set of time-series Moderate Resolution Imaging Spectroradiometer (MODIS) normalized difference vegetation index (NDVI) from 2000 to 2018 was used to analyze the seasonal dynamics and interannual trends of vegetation over the wintering period from October to January. The results showed that the average NDVI exhibited an overall increasing trend, with the trend rising slowly in recent years. The largest monthly mean NDVI generally occurred in November, which is pertinent to the quantity of wintering waterfowl in the East Dongting Lake wetland. Meanwhile, the mean NDVI in the wintering season is significantly correlated to temperature and water area, with apparent lagging effects. Long-term stability analysis presented a gradually decreasing pattern from the central body of water to the surrounding area. All analyses will help the government to make appropriate management strategies to protect the habitat of wintering waterfowl in the wetland.

Response ofCarex cinerascenspopulations to groundwater level gradients in the Poyang Lake wetland

2016 ◽  
Vol 36 (16) ◽  
Author(s):  
冯文娟 FENG Wenjuan ◽  
徐力刚 XU Ligang ◽  
王晓龙 WANG Xiaolong ◽  
李海英 LI Haiying ◽  
姜加虎 JIANG Jiahu
Keyword(s):  
Groundwater Level ◽  
Poyang Lake ◽  
Poyang Lake Wetland

Assessing ecological health of Poyang Lake wetland, using benthic macroinvertebrate-based index of biotic integrity (B-IBI)

2019 ◽  
Vol 39 (18) ◽  
Author(s):  
游清徽 YOU Qinghui ◽  
刘玲玲 LIU Lingling ◽  
方娜 FANG Na ◽  
阳文静 YANG Wenjing ◽  
张华 ZHANG Hua ◽  
...  
Keyword(s):  
Poyang Lake ◽  
Index Of Biotic Integrity ◽  
Biotic Integrity ◽  
Benthic Macroinvertebrate ◽  
Ecological Health ◽  
Poyang Lake Wetland

scholarly journals Evidences of hydraulic relationships between groundwater and lake water across the large floodplain wetland of Poyang Lake, China

2017 ◽  
Vol 18 (2) ◽  
pp. 698-712 ◽  
Author(s):  
Yunliang Li ◽  
Jing Yao ◽  
Guizhang Zhao ◽  
Qi Zhang
Keyword(s):  
Water Level ◽  
Lake Water ◽  
Poyang Lake ◽  
Spatial And Temporal Variability ◽  
Floodplain Wetland ◽  
Lake Water Level ◽  
Groundwater Dynamics ◽  
Isotope Evidence ◽  
To Receive ◽  
Poyang Lake Wetland

Abstract Hydraulic relationship between wetlands and lakes has become an important topic for the scientific and decision-making communities. Poyang Lake, an open freshwater lake in China, and the extensive floodplain wetland surrounding the lake, plays an important role in protecting the biodiversity of this internationally recognized wetland system. This paper is the first field-based study into an investigation of the groundwater dynamics in the floodplain wetland and the associated hydraulic relationship with the lake using hydrological, hydrochemical and stable isotope evidence, as exemplified by Poyang Lake wetland. Results show that groundwater stores within the floodplain wetland exhibit spatial and temporal variability in terms of the magnitudes of groundwater level variations. Floodplain groundwater fluctuations largely reflect patterns of the precipitation and the lake water level; however, the groundwater dynamics are highly affected by the variations in the lake water level, rather than local precipitation. Floodplain wetland is most likely to receive the lake water during spring and summer and may recharge the lake during periods of low lake water level. Additionally, floodplain groundwater displays similar hydrochemical and environmental isotope signatures to that of the lake at different sampling periods, indicating a close hydraulic relationship between groundwater and the lake throughout the year.

scholarly journals Vegetation Carbon Sequestration Mapping in Herbaceous Wetlands by Using a MODIS EVI Time-Series Data Set: A Case in Poyang Lake Wetland, China

2020 ◽  
Vol 12 (18) ◽  
pp. 3000
Author(s):  
Xue Dai ◽  
Guishan Yang ◽  
Desheng Liu ◽  
Rongrong Wan
Keyword(s):  
Time Series ◽  
Carbon Sequestration ◽  
Vegetation Index ◽  
Time Series Data ◽  
Poyang Lake ◽  
Carbon Stocks ◽  
Series Data ◽  
Biomass Carbon ◽  
Vegetation Carbon ◽  
Poyang Lake Wetland

The carbon sequestration capacity of wetland vegetation determines carbon stocks and changes in wetlands. However, modeling vegetation carbon sequestration of herbaceous wetlands is still problematic due to complex hydroecological processes and rapidly changing biomass carbon stocks. Theoretically, a vegetation index (VI) time series can retrieve the dynamic of biomass carbon stocks and could be used to calculate the cumulative composite of biomass carbon stocks during a given interval, i.e., vegetation carbon sequestration. Hence, we explored the potential for mapping vegetation carbon sequestration in herbaceous wetlands in this study by using a combination of remotely sensed VI time series and field observation data. This method was exemplarily applied for Poyang Lake wetland in 2016 by using a 16-day Moderate Resolution Imaging Spectroradiometer (MODIS) enhanced vegetation index (EVI) time series. Results show that the vegetation carbon sequestration in this area was in the range of 193–1221 g C m−2 year−1 with a mean of 401 g C m−2 year−1 and a standard deviation of 172 g C m−2 year−1 in 2016. The approach has wider spatial applicability in wetlands than the currently used global map of vegetation production (MOD17A3) because our carbon estimation in areas depicted by ‘no data’ in the MOD17A3 product is considerable, which accounts for 91.2–91.5% of the total vegetation carbon sequestration of the wetland. Thus, we determined that VI time series data shows great potential for estimating vegetation carbon sequestration in herbaceous wetlands, especially with the continuously improving quality and frequency of satellite VI images.

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