Dynamics of Lake Dongting wetland from 1993 to 2010

Fan, Daidu; Wang, Xuelei; Li, Enhua; Xiaobin, CAI; Jinliang, Huang; Hu, Yanxia; Liuzhi, JIANG

doi:10.18307/2012.0410

Cited by 6 publications

References 1 publication

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The impact of Three Gorges Dam on the downstream eco‐hydrological environment and vegetation distribution of East Dongting Lake

et al. 2014

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The ecological and environmental consequences of large dam projects have received increasing attention in the recent decades. On the basis of daily water‐level data, six periods of TM/ETM+ data and a digital elevation model, the eco‐hydrological environments and vegetation area of East Dongting Lake, were compared for the years 1995–2011, spanning periods before and after the implementation of the Three Gorges Dam (TGD) in 2003. Vegetation area (including three types: forestry, reed and grass) continuously expanded, and the minimum elevation of vegetation‐covered area (VCA) gradually decreased by 0·88 m from 1995 to 2011. Following the implementation of the TGD, the rates of both vegetation expansion (12·3 vs 14·1 km2 year−1) and the lowering of minimum elevation of VCA (3·1 vs 7·9 cm year−1) increased rapidly. Monthly water level decreased considerably from July to November, and annual submergence duration at elevations of 22–26 and 30 m was considerably decreased after the TGD was implemented. The average maximum submergence duration of VCA was 231 days. Almost equal linear equations describing elevation change from 1995 to 2011 indicated that the minimum elevation of VCA identified via analysis of TM/ETM+ images can be represented by the maximum submergence duration evaluated via daily water level. These data indicate that vegetation colonized the non‐vegetation area (including mud beach or water body) more quickly after the implementation of the TGD, due to the drastic changes in eco‐hydrological environments such as the decreasing water level and the minimum elevation of VCA. The present methodology might allow faster and more reliable assessment of inundation related landscape impacts on a basin scale and thereby contribute to biodiversity monitoring and policy assessment. Copyright © 2014 John Wiley & Sons, Ltd.

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The impact of Three Gorges Dam on the downstream eco‐hydrological environment and vegetation distribution of East Dongting Lake

et al. 2014

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Marsh Grassland Ecosystem

Chen

Han

et al. 2020

Ecosystems of China

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Dynamics of the lakes in the middle and lower reaches of the Yangtze River basin, China, since late nineteenth century

Gao

Zhao

et al. 2012

Environ Monit Assess

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The middle and lower reaches of the Yangtze River basin have the most representative and largest concentration of freshwater lakes in China. However, the size and number of these lakes have changed considerably over the past century due to the natural and anthropogenic impact. The lakes, larger than 10 km(2) in size, were chosen from relief maps and remotely sensed images in 1875, 1950, 1970, 1990, 2000, and 2008 to study the dynamics of lakes in the middle and lower reaches of the Yangtze River basin and to examine the causes and consequences of these changes. Results indicated that there was a dramatic reduction in lake areas, which decreased by 7,841.2 km(2) (42.64 %) during the study period (1875-2008), and the number of lakes in this region changed moderately. Meanwhile, a large number of lakes in the middle and lower reaches of the Yangtze River basin were directly converted into paddy fields, ponds, building lands, or other land-use types over the study period. Therefore, all kinds of lake reclamation should be identified as the major driving factors for the loss of lake in this region. Furthermore, flooding, soil erosion, and sedimentation were also the main factors which triggered lake changes in different periods. Some wetland conservation and restoration projects have been implemented since the 1970s, but they have not reversed the lake degradation. These findings were of great importance to managers involved in making policy for the conservation of lake ecosystems and the utilization of lake resources.

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Dynamics of Lake Dongting wetland from 1993 to 2010

Cited by 6 publications

References 1 publication

The impact of Three Gorges Dam on the downstream eco‐hydrological environment and vegetation distribution of East Dongting Lake

The impact of Three Gorges Dam on the downstream eco‐hydrological environment and vegetation distribution of East Dongting Lake

Marsh Grassland Ecosystem

Dynamics of the lakes in the middle and lower reaches of the Yangtze River basin, China, since late nineteenth century

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