Evapotranspiration Partitioning and Response to Abnormally Low Water Levels in a Floodplain Wetland in China

Evapotranspiration (ET) is an important component of the wetland water budget. Water level declines in Poyang Lake, the largest freshwater lake in China, have caused concerns, especially during low water levels. However, how wetland ET and its partitioning respond to abnormally low water levels is u...

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Main Authors: Xiaosong Zhao, Yuanbo Liu
Format: Article
Language:English
Published: Hindawi Limited 2016-01-01
Series:Advances in Meteorology
Online Access:http://dx.doi.org/10.1155/2016/3695427
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spelling doaj-6f5e5818b59547c6a05407fcda6f4e072020-11-25T00:29:48ZengHindawi LimitedAdvances in Meteorology1687-93091687-93172016-01-01201610.1155/2016/36954273695427Evapotranspiration Partitioning and Response to Abnormally Low Water Levels in a Floodplain Wetland in ChinaXiaosong Zhao0Yuanbo Liu1Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, ChinaKey Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, ChinaEvapotranspiration (ET) is an important component of the wetland water budget. Water level declines in Poyang Lake, the largest freshwater lake in China, have caused concerns, especially during low water levels. However, how wetland ET and its partitioning respond to abnormally low water levels is unclear. In this study, wetland ET was estimated with MODIS data and meteorological data. The wetland ET partitioning and its relationship with abnormally low water levels were analyzed for 2000–2013. The results showed that the water evaporation rate (Ewater) was larger than the land ET rate (ETland); the ETland/Ewater ranged from 0.77 to 0.99. When the water level was below 12.8 m, the ET partition ratio was larger than 1, which indicates that wetland ET comes from land surface ET more than water evaporation. The negative standardized water level index (SWI) was used to represent an abnormally low water level in the wetland. Although the monthly wetland ET decreased as the negative SWI decreased, ETland was higher than the average under negative SWI conditions from September to December, when the water level decreased. The abnormally low water level induced more water loss from the land surface, especially when the water level decreased, which reduced the available water resources along the wetland shore.http://dx.doi.org/10.1155/2016/3695427
collection DOAJ
language English
format Article
sources DOAJ
author Xiaosong Zhao
Yuanbo Liu
spellingShingle Xiaosong Zhao
Yuanbo Liu
Evapotranspiration Partitioning and Response to Abnormally Low Water Levels in a Floodplain Wetland in China
Advances in Meteorology
author_facet Xiaosong Zhao
Yuanbo Liu
author_sort Xiaosong Zhao
title Evapotranspiration Partitioning and Response to Abnormally Low Water Levels in a Floodplain Wetland in China
title_short Evapotranspiration Partitioning and Response to Abnormally Low Water Levels in a Floodplain Wetland in China
title_full Evapotranspiration Partitioning and Response to Abnormally Low Water Levels in a Floodplain Wetland in China
title_fullStr Evapotranspiration Partitioning and Response to Abnormally Low Water Levels in a Floodplain Wetland in China
title_full_unstemmed Evapotranspiration Partitioning and Response to Abnormally Low Water Levels in a Floodplain Wetland in China
title_sort evapotranspiration partitioning and response to abnormally low water levels in a floodplain wetland in china
publisher Hindawi Limited
series Advances in Meteorology
issn 1687-9309
1687-9317
publishDate 2016-01-01
description Evapotranspiration (ET) is an important component of the wetland water budget. Water level declines in Poyang Lake, the largest freshwater lake in China, have caused concerns, especially during low water levels. However, how wetland ET and its partitioning respond to abnormally low water levels is unclear. In this study, wetland ET was estimated with MODIS data and meteorological data. The wetland ET partitioning and its relationship with abnormally low water levels were analyzed for 2000–2013. The results showed that the water evaporation rate (Ewater) was larger than the land ET rate (ETland); the ETland/Ewater ranged from 0.77 to 0.99. When the water level was below 12.8 m, the ET partition ratio was larger than 1, which indicates that wetland ET comes from land surface ET more than water evaporation. The negative standardized water level index (SWI) was used to represent an abnormally low water level in the wetland. Although the monthly wetland ET decreased as the negative SWI decreased, ETland was higher than the average under negative SWI conditions from September to December, when the water level decreased. The abnormally low water level induced more water loss from the land surface, especially when the water level decreased, which reduced the available water resources along the wetland shore.
url http://dx.doi.org/10.1155/2016/3695427
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