Differences of Regulative Flexibility between Hydrological Isolated and Connected Lakes in a Large Floodplain: Insight from Inundation Dynamics and Landscape Heterogeneity
The inundation areas of floodplains are crucial to wetland ecosystems, especially in supporting biodiversity. Accurately identifying the spatial and temporal patterns of inundation areas is important for understanding floodplain ecosystem processes. Here, lakes in the Yangtze River Floodplain were d...
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MDPI AG
2020-04-01
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| author | Jiakun Teng Shaoxia Xia Yu Liu Peng Cui Jiang Chen Wuwei Si Houlang Duan Xiubo Yu |
| author_facet | Jiakun Teng Shaoxia Xia Yu Liu Peng Cui Jiang Chen Wuwei Si Houlang Duan Xiubo Yu |
| author_sort | Jiakun Teng |
| collection | DOAJ |
| description | The inundation areas of floodplains are crucial to wetland ecosystems, especially in supporting biodiversity. Accurately identifying the spatial and temporal patterns of inundation areas is important for understanding floodplain ecosystem processes. Here, lakes in the Yangtze River Floodplain were divided into two types according to hydrological conditions: the natural connected lakes (Dongting Lake and Poyang Lake) with natural water level fluctuations and the isolated lakes (lakes in Jianghan Plain) with stable water levels. We established a method to identify inundation areas using multi-sources remote sensing data based on the Google Earth Engine. The dynamics of inundation areas were determined, and the relative indices were calculated in common year (2017) and a drought year (2018). The differences between the connected lakes and the isolated lakes were analyzed, and impacts of hydrological fluctuations on inundation area and habitat quality were evaluated. The results show that lakes with natural hydrological fluctuations have a greater regulative flexibility, with both patch density (PD) and submerged elasticity index (SEI) values higher than that of isolated lakes. The trend of the vegetation index in the connected lakes and in the isolated lakes is also different. The mean EVI in Dongting Lake and Poyang Lake showed a U-shaped trend which is similar to the shape of the trend of PD. The trend of mean enhanced vegetation index (EVI) in the isolated lakes is the opposite and has a lower range of variation over a year. This study provides new indicators and rapid methods for habitat quality assessment in floodplains, as well as presenting scientific information useful for improving wetland management in the middle and lower Yangtze River. |
| first_indexed | 2024-03-10T20:46:29Z |
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| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-10T20:46:29Z |
| publishDate | 2020-04-01 |
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| series | Water |
| spelling | doaj.art-fda0585f855f46a3b06b2ba26e1080d52023-11-19T20:19:37ZengMDPI AGWater2073-44412020-04-0112499110.3390/w12040991Differences of Regulative Flexibility between Hydrological Isolated and Connected Lakes in a Large Floodplain: Insight from Inundation Dynamics and Landscape HeterogeneityJiakun Teng0Shaoxia Xia1Yu Liu2Peng Cui3Jiang Chen4Wuwei Si5Houlang Duan6Xiubo Yu7Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, ChinaKey Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, ChinaKey Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, ChinaResearch Center for Nature Conservation and Biodiversity, Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, ChinaOffice of Poyang Lake Water Control Project Construction of Jiangxi Province, Nanchang 330009, ChinaPoyang Lake Hydrological Bureau in Jiangxi, Jiujiang 332800, ChinaKey Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, ChinaKey Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, ChinaThe inundation areas of floodplains are crucial to wetland ecosystems, especially in supporting biodiversity. Accurately identifying the spatial and temporal patterns of inundation areas is important for understanding floodplain ecosystem processes. Here, lakes in the Yangtze River Floodplain were divided into two types according to hydrological conditions: the natural connected lakes (Dongting Lake and Poyang Lake) with natural water level fluctuations and the isolated lakes (lakes in Jianghan Plain) with stable water levels. We established a method to identify inundation areas using multi-sources remote sensing data based on the Google Earth Engine. The dynamics of inundation areas were determined, and the relative indices were calculated in common year (2017) and a drought year (2018). The differences between the connected lakes and the isolated lakes were analyzed, and impacts of hydrological fluctuations on inundation area and habitat quality were evaluated. The results show that lakes with natural hydrological fluctuations have a greater regulative flexibility, with both patch density (PD) and submerged elasticity index (SEI) values higher than that of isolated lakes. The trend of the vegetation index in the connected lakes and in the isolated lakes is also different. The mean EVI in Dongting Lake and Poyang Lake showed a U-shaped trend which is similar to the shape of the trend of PD. The trend of mean enhanced vegetation index (EVI) in the isolated lakes is the opposite and has a lower range of variation over a year. This study provides new indicators and rapid methods for habitat quality assessment in floodplains, as well as presenting scientific information useful for improving wetland management in the middle and lower Yangtze River.https://www.mdpi.com/2073-4441/12/4/991inundation areahydrological connectivityremote sensing imagesGoogle Earth EngineYangtze River Floodplain |
| spellingShingle | Jiakun Teng Shaoxia Xia Yu Liu Peng Cui Jiang Chen Wuwei Si Houlang Duan Xiubo Yu Differences of Regulative Flexibility between Hydrological Isolated and Connected Lakes in a Large Floodplain: Insight from Inundation Dynamics and Landscape Heterogeneity Water inundation area hydrological connectivity remote sensing images Google Earth Engine Yangtze River Floodplain |
| title | Differences of Regulative Flexibility between Hydrological Isolated and Connected Lakes in a Large Floodplain: Insight from Inundation Dynamics and Landscape Heterogeneity |
| title_full | Differences of Regulative Flexibility between Hydrological Isolated and Connected Lakes in a Large Floodplain: Insight from Inundation Dynamics and Landscape Heterogeneity |
| title_fullStr | Differences of Regulative Flexibility between Hydrological Isolated and Connected Lakes in a Large Floodplain: Insight from Inundation Dynamics and Landscape Heterogeneity |
| title_full_unstemmed | Differences of Regulative Flexibility between Hydrological Isolated and Connected Lakes in a Large Floodplain: Insight from Inundation Dynamics and Landscape Heterogeneity |
| title_short | Differences of Regulative Flexibility between Hydrological Isolated and Connected Lakes in a Large Floodplain: Insight from Inundation Dynamics and Landscape Heterogeneity |
| title_sort | differences of regulative flexibility between hydrological isolated and connected lakes in a large floodplain insight from inundation dynamics and landscape heterogeneity |
| topic | inundation area hydrological connectivity remote sensing images Google Earth Engine Yangtze River Floodplain |
| url | https://www.mdpi.com/2073-4441/12/4/991 |
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