scholarly journals Poyang Lake Wetland Ecosystem Health Assessment of Using the Wetland Landscape Classification Characteristics

Water ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 825 ◽  
Author(s):  
Hailin You ◽  
Hongxiang Fan ◽  
Ligang Xu ◽  
Yongming Wu ◽  
Lizhen Liu ◽  
...  
Keyword(s):  
Health Status ◽  
Water Level ◽  
Poyang Lake ◽  
Health Assessment ◽  
Downward Trend ◽  
Ecosystem Functions ◽  
Hydrological Process ◽  
Wetland Landscape ◽  
Specific Effects ◽  
Poyang Lake Wetland

Currently, wetland stability is under threat due to the joint effects of global climate change and human activity, especially in lakes. Hence, it is necessary to evaluate the health status of wetland ecosystems such as lakes, identify the variables causing the wetland degradation and work to protect the wetlands from the identified variables in the future. Based on fourteen high-resolution autumn remote sensing images from 1989–2013, the classification characteristics and spatial distribution patterns of wetland landscapes in Poyang Lake were studied through quantitative interpretation technology. An established health assessment index system named the EHCI (Ecological Health Comprehensive Index) was used to assess the health status of Poyang Lake. Additionally, the relationship between water regime and health status of wetland landscape distribution of Poyang Lake were investigated by multivariate statistical analysis. The results demonstrated: (1) The total area of three first level (or six second level) types of wetland landscapes showed a stable status, which was long-term maintaining at about 3026 km2 from 1989–2013. (2) The water area shows a downward trend, while the areas of vegetation and land-water transition zone show upward trends. (3) The proposed EHCI of the Poyang Lake wetland presented a downward trend. According to the EHCI results from 1989–2013, the health status of Poyang Lake wetland was healthy for two years, unhealthy for four years and sub-healthy for eight years. (4) The water level fluctuation greatly affected the EHCI, and the effect became greater as the water level increased. These results contribute to the understanding of specific effects of hydrological process on the health status of the Poyang Lake wetland. In addition they provide a scientific reference for the maintenance of stable ecosystem functions of the seasonal freshwater lake. These results contribute to the understanding of specific effects of hydrological process on the health status of the Poyang Lake. In addition they provide a scientific reference for the maintenance of stable ecosystem functions of the seasonal freshwater lake.

scholarly journals Spatial-temporal variability of the fluctuation of water level in Poyang Lake basin, China

2018 ◽  
Vol 10 (1) ◽  
pp. 940-953 ◽  
Author(s):  
Lixin Ning ◽  
Yunkai Zhou ◽  
Jing Yang ◽  
Changxiu Cheng ◽  
Changqing Song ◽  
...  
Keyword(s):  
Water Level ◽  
Poyang Lake ◽  
Permutation Entropy ◽  
Lake Basin ◽  
Hydrological Process ◽  
Spring Precipitation ◽  
Poyang Lake Basin ◽  
Basin Scale ◽  
Catchment Size ◽  
Deviation Coefficient

Abstract Poyang Lake basin is one of the most biodiversity areas in China. Fluctuation of water level is an important factor of hydrological process which is a guarantee of ecosystem health and biodiversity conservation. To measure its spatial-temporal variation, classical statistical methods and permutation entropy were employed: 1) Variation of water level downstream of Poyang Lake during one year follows a periodical pattern, while it is random in upper reaches. That is, the range of water level in upper reaches is much less than that in downstream. 2) Fluctuation of water level in winter and spring is more complicated, more irregular and more random than that in other seasons. This is because in winter and spring, precipitation directly causes rising in water level rather than generating surface runoff, while it is reversed in summer. 3) The ranges, standard deviation, coefficient of variation and fluctuation of water level decrease with rising in elevation. 4) In sub-basin scale, fluctuation of water level in upper reaches is more complicated than that in downstream, e specially along one river. Mechanically, catchment size and confluence process may be the main factors influencing fluctuation of water level over Poyang Lake basin.

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.

Analysis of Wetland Ecosystem Response of Poyang Lake with Water Level Evolution Base on TM Images

2013 ◽  
Vol 295-298 ◽  
pp. 1935-1940 ◽  
Author(s):  
Yu Ru Lin ◽  
Ya Ping Du ◽  
Hua Mei Yang
Keyword(s):  
Spatial Distribution ◽  
Water Level ◽  
Transition Zone ◽  
Poyang Lake ◽  
Ecological System ◽  
Hydrological Process ◽  
Wetland Ecosystem ◽  
Ecosystem Response ◽  
Hydrologic Data ◽  
Optimum Water

The response of wetland ecosystem of Poyang Lake influenced by hydrological process changes was addressed. The spatial distribution and area of water, water-land transition zone and exposed grass continent were obtained by classification and extraction of wetland based on Landsat-TM images and analysis of observed hydrologic data. The results indicated that wetland ecological system of Poyang Lake was characteristic of complexity,sensitivity,mutability and fragility, and the optimum water level of wetland in Poyang Lake was 10-14m.

Impact of seasonal water-level fluctuations on autumn vegetation in Poyang Lake wetland, China

2019 ◽  
Vol 13 (2) ◽  
pp. 398-409 ◽  
Author(s):  
Xue Dai ◽  
Rongrong Wan ◽  
Guishan Yang ◽  
Xiaolong Wang ◽  
Ligang Xu ◽  
...  
Keyword(s):  
Water Level ◽  
Poyang Lake ◽  
Water Level Fluctuations ◽  
Poyang Lake Wetland

scholarly journals Spatiotemporal Variation of Siberian Crane Habitats and the Response to Water Level in Poyang Lake Wetland, China

2021 ◽  
Vol 13 (1) ◽  
pp. 140
Author(s):  
Lin Zou ◽  
Bisong Hu ◽  
Shuhua Qi ◽  
Qianqian Zhang ◽  
Pan Ning
Keyword(s):  
Spatial Pattern ◽  
Water Level ◽  
Hot Spots ◽  
Poyang Lake ◽  
Structural Characteristics ◽  
Water Levels ◽  
Thematic Mapper ◽  
Nature Reserves ◽  
Cold Spots ◽  
Poyang Lake Wetland

The Poyang Lake wetland in China is the largest wintering destination for Siberian cranes worldwide. Understanding the spatiotemporal characteristics of crane habitats is of great importance for ecological environment governance and biodiversity protection. The shallow water, grassland, and soft mudflat regions of the Poyang Lake wetland are ideal habitats for wintering Siberian cranes. Based on Landsat Thematic Mapper (TM), Enhanced Thematic Mapper Plus (ETM+), and Operational Land Imager (OLI) remote sensing images, habitat areas were extracted and associated with various water levels taken on multiple dates. Landscape metrics were applied to describe the spatial structural characteristics of the crane habitats, and spatial statistics are used to explore the cold and hot spots of their distribution. Moreover, three indicators including sustainability, stability, and variety were applied to evaluate the vulnerability of the crane habitats under different hydrological conditions. Our findings indicate: (a) The main crane habitats exhibit a gradual decreasing degree of fragmentation in time, an obvious uncertainty of shape complexity and a relatively stable connectivity. (b) The crane habitats have a consistent spatial pattern of highly aggregated distributions associated with various water levels. (c) The hot spots of the habitats formed multiple “sheet” belts centered on the “Lake Enclosed in Autumn” regions, while the cold spots indicate a spatial pattern of axial distributions. (d) The majority of the hot spots of the habitats were distributed in sub-lakes found in the southeast part of the Poyang Lake watershed and the Nanjishan and Wucheng nature reserves, while the cold spots were mainly distributed in the main channels of the basins of Poyang Lake. (e) The sustainable habitats were mainly distributed in the “Lake Enclosed in Autumn” regions and intensively aggregated in two national nature reserves. (f) Under conditions of extremely low to average water levels (5.3–11.46 m), an increase of water level causes a decrease of the stability and variety of the crane habitats and weakens the aggregation structure.

scholarly journals Water Level Has Higher Influence on Soil Organic Carbon and Microbial Community in Poyang Lake Wetland Than Vegetation Type

2022 ◽  
Vol 10 (1) ◽  
pp. 131
Author(s):  
Qiong Ren ◽  
Jihong Yuan ◽  
Jinping Wang ◽  
Xin Liu ◽  
Shilin Ma ◽  
...  
Keyword(s):  
Microbial Community ◽  
Organic Carbon ◽  
Carbon Cycle ◽  
Water Content ◽  
Water Level ◽  
Soil Water ◽  
Soil Water Content ◽  
Poyang Lake ◽  
Vegetation Type ◽  
Poyang Lake Wetland

Although microorganisms play a key role in the carbon cycle of the Poyang Lake wetland, the relationship between soil microbial community structure and organic carbon characteristics is unknown. Herein, high-throughput sequencing technology was used to explore the effects of water level (low and high levels above the water table) and vegetation types (Persicaria hydropiper and Triarrhena lutarioriparia) on microbial community characteristics in the Poyang Lake wetland, and the relationships between soil microbial and organic carbon characteristics were revealed. The results showed that water level had a significant effect on organic carbon characteristics, and that soil total nitrogen, organic carbon, recombinant organic carbon, particle organic carbon, and microbial biomass carbon were higher at low levels above the water table. A positive correlation was noted between soil water content and organic carbon characteristics. Water level and vegetation type significantly affected soil bacterial and fungal diversity, with water level exerting a higher effect than vegetation type. The impacts of water level and vegetation type were higher on fungi than on bacteria. The bacterial diversity and evenness were significantly higher at high levels above the water table, whereas an opposite trend was noted among fungi. The bacterial and fungal richness in T. lutarioriparia community soil was higher than that in P. hydropiper community soil. Although both water level and vegetation type had significant effects on bacterial and fungal community structures, the water level had a higher impact than vegetation type. The bacterial and fungal community changes were the opposite at different water levels but remained the same in different vegetation soils. The organic carbon characteristics of wetland soil were negatively correlated with bacterial diversity but positively correlated with fungal diversity. Soil water content, soluble organic carbon, C/N, and microbial biomass carbon were the key soil factors affecting the wetland microbial community. Acidobacteria, Alphaproteobacteria, Verrucomicrobia, Gammaproteobacteria, and Eurotiomycetes were the key microbiota affecting the soil carbon cycle in the Poyang Lake wetland. Thus, water and carbon sources were the limiting factors for bacteria and fungi in wetlands with low soil water content (30%). Hence, the results provided a theoretical basis for understanding the microbial-driven mechanism of the wetland carbon cycle.

Vulnerability of Siberian crane habitat to water level in Poyang Lake wetland, China

2014 ◽  
Vol 51 (6) ◽  
pp. 662-676 ◽  
Author(s):  
Feng Jiang ◽  
Shuhua Qi ◽  
Fuqiang Liao ◽  
Mingjun Ding ◽  
Yeqiao Wang
Keyword(s):  
Water Level ◽  
Poyang Lake ◽  
Siberian Crane ◽  
Poyang Lake Wetland
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