longgan lake
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Water ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 2178
Author(s):  
Wenxia Tan ◽  
Jindi Xing ◽  
Shao Yang ◽  
Gongliang Yu ◽  
Panpan Sun ◽  
...  

Aquatic vegetation in shallow freshwater lakes are severely degraded worldwide, even though they are essential for inland ecosystem services. Detailed information about the long term variability of aquatic plants can help investigate the potential driving mechanisms and help mitigate the degradation. In this paper, based on Google Earth Engine cloud-computing platform, we made use of a 33-year (1987–2019) retrospective archive of moderate resolution Landsat TM, ETM + and OLI satellite images to estimate the extent changes in aquatic vegetation in Longgan Lake from Middle Yangtze River Basin in China using the modified enhanced vegetation index, including emerged, floating-leaved and floating macrophytes. The analysis of the long term dynamics of aquatic vegetation showed that aquatic vegetation were mainly distributed in the western part of the lake, where lake bottom elevation ranged from 11 to 12 m, with average water depth of less than 1 m in spring. The vegetation area variation for the 33-year period were divided into six stages. In years with heavy precipitation, the vegetation area decreased sharply. In the following years, the area normally restored. Aquatic vegetation area had a significant negative correlation with the spring water level and summer water level. The results showed that aquatic vegetation was negatively affected when water depth exceeded 2.5 m in May and 5 m in summer. It is recommended that water depth remain close to 1 m in spring and close to 3 m in summer for aquatic vegetation growth. Our study provide quantitative evidence that water-level fluctuations drive vegetation changes in Longgan Lake, and present a basis for sustainable lake restoration and management.


The Holocene ◽  
2017 ◽  
Vol 27 (9) ◽  
pp. 1318-1324 ◽  
Author(s):  
Jiantao Xue ◽  
Jingjing Li ◽  
Xinyue Dang ◽  
Philip A Meyers ◽  
Xianyu Huang

We have reconstructed the history of late-Holocene paleohydrological changes in the middle and lower reaches of the Yangtze River using grain size and n-alkane data from a sediment core retrieved from Longgan Lake. We employ changes in the grain size distribution to reflect the water level in the floodplain lake, with a higher percentage of the finer fraction indicating higher water level and vice versa. The n-alkane molecular distribution, average chain length (ACL), and Paq ratio (C23+C25)/(C23+C25+C29+C31) are used to reflect mainly vegetation composition that is also sensitive to water depth. Our results reveal that the lake water level was relatively low and gradually increased from 4 to 2.7 ka. The period from 2.7 to 1.2 ka exhibited the highest late-Holocene lake water level in this region. The water level then decreased toward the present. This paleohydrological reconstruction agrees with existing paleoclimate reconstructions of the middle and lower reaches of the Yangtze River, confirming that the intensity of Asian monsoon rains is an important factor in affecting paleohydrological changes in this region.


2013 ◽  
Vol 71 (10) ◽  
pp. 4553-4564 ◽  
Author(s):  
Haijian Bing ◽  
Yanhong Wu ◽  
Yinjun Zhang ◽  
Xiangdong Yang

2012 ◽  
Vol 69 (8) ◽  
pp. 2679-2689 ◽  
Author(s):  
Haijian Bing ◽  
Yanhong Wu ◽  
Wook-Hyun Nahm ◽  
Enfeng Liu

2010 ◽  
Vol 53 (8) ◽  
pp. 1188-1194 ◽  
Author(s):  
YanHong Wu ◽  
EnFeng Liu ◽  
HaiJian Bing ◽  
XiangDong Yang ◽  
Bin Xue ◽  
...  

Plant Ecology ◽  
2006 ◽  
Vol 189 (1) ◽  
pp. 127-137 ◽  
Author(s):  
Long-Yi Yuan ◽  
Gui-Hua Liu ◽  
Wei Li ◽  
En-Hua Li

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