Spatiotemporal variability of ecosystem water use efficiency in northern Ethiopia during 1982–2014

2021 ◽  
Vol 603 ◽  
pp. 126863
Author(s):  
Samuale Tesfaye ◽  
Gebeyehu Taye ◽  
Emiru Birhane ◽  
Sjoerd E.A.T.M van der Zee
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Spatiotemporal Variability ◽  
Northern Ethiopia ◽  
Ecosystem Water Use Efficiency ◽  
Use Efficiency

scholarly journals Response of Ecosystem Water Use Efficiency to Drought over China during 1982–2015: Spatiotemporal Variability and Resilience

Forests ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 598 ◽  
Author(s):  
Limai Guo ◽  
Fubao Sun ◽  
Wenbin Liu ◽  
Yongguang Zhang ◽  
Hong Wang ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Inner Mongolia ◽  
Northeast China ◽  
Southern China ◽  
Central China ◽  
Spatiotemporal Variability ◽  
Chinese Government ◽  
Ecosystem Water Use Efficiency ◽  
Use Efficiency

Ecosystem water use efficiency (WUE describes carbon-water flux coupling in terrestrial ecosystems. Understanding response and resilience of WUE to drought are essential for sustainable water resource and ecosystem management under increasing drought risks over China due to climate warming. Here we analyzed the response of ecosystem WUE to drought (spatiotemporal variability and resilience) over China during 1982–2015 based on an evapotranspiration (ET) dataset based on the model tree ensemble (MTE) algorithm using flux-tower ET measurements and satellite-retrieved GPP data. The results showed that the multiyear average WUE was 1.55 g C kg−1 H2O over China. WUE increased in 77.1% of Chinese territory during the past 34 years. During drought periods, the ecosystem WUE increased mainly in the northeast of Inner Mongolia, Northeast China and some regions in southern China with abundant forests but decreased in northwestern and central China. An apparent lagging effect of drought on ecosystem WUE was observed in the east of Inner Mongolia and Northeast China, the west and east regions of North China and the central part of Tibetan Plateau. Some ecosystems (e.g., deciduous needle-leaf forests, deciduous broadleaf forests, evergreen broadleaf forests and evergreen needle-leaf forests) in Central China, Northeast and Southwest China exhibited relatively greater resilience to drought than others by improving their WUE. Our findings would provide useful information for Chinese government to adopt a reasonable approach for maintaining the structure and functions of ecosystems under drought disturbance in future.

scholarly journals Assessing the Response of Ecosystem Water Use Efficiency to Drought During and after Drought Events across Central Asia

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 581 ◽  
Author(s):  
Jie Zou ◽  
Jianli Ding ◽  
Martin Welp ◽  
Shuai Huang ◽  
Bohua Liu
Keyword(s):  
Water Use Efficiency ◽  
Central Asia ◽  
Water Use ◽  
Severe Drought ◽  
Vegetation Types ◽  
Drought Period ◽  
Legacy Effect ◽  
Ecosystem Water Use Efficiency ◽  
Use Efficiency ◽  
The Mean

The frequency and intensity of drought are expected to increase worldwide in the future. However, it is still unclear how ecosystems respond to drought. Ecosystem water use efficiency (WUE) is an essential ecological index used to measure the global carbon–water cycles, and is defined as the carbon absorbed per unit of water lost by the ecosystem. In this study, we applied gross primary productivity (GPP), evapotranspiration (ET), land surface temperature (LST), and normalized difference vegetation index (NDVI) data to calculate the WUE and drought index (temperature vegetation dryness index (TVDI)), all of which were retrieved from moderate resolution imaging spectroradiometer (MODIS) data. We compared the mean WUE across different vegetation types, drought classifications, and countries. The temporal and spatial changes in WUE and drought were analyzed. The correlation between drought and WUE was calculated and compared across different vegetation types, and the differences in WUE between drought and post-drought periods were compared. The results showed that (1) ecosystems with a low (high) productivity had a high (low) WUE, and the mean ecosystem WUE of Central Asia showed vast differences across various drought levels, countries, and vegetation types. (2) The WUE in Central Asia exhibited an increasing trend from 2000 to 2014, and Central Asia experienced both drought (from 2000 to 2010) and post-drought (from 2011 to 2014) periods. (3) The WUE showed a negative correlation with drought during the drought period, and an obvious drought legacy effect was found, in which severe drought affected the ecosystem WUE over the following two years, while a positive correlation between WUE and drought was found in the post-drought period. (4) A significant increase in ecosystem WUE was found after drought, which revealed that arid ecosystems exhibit high resilience to drought stress. Our results can provide a specific reference for understanding how ecosystems will respond to climate change.

Environmental and canopy stomatal control on ecosystem water use efficiency in a riparian poplar plantation

2020 ◽  
Vol 287 ◽  
pp. 107953 ◽  
Author(s):  
Hang Xu ◽  
Zhiqiang Zhang ◽  
Jingfeng Xiao ◽  
Jiquan Chen ◽  
Mengxun Zhu ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Poplar Plantation ◽  
Stomatal Control ◽  
Ecosystem Water Use Efficiency ◽  
Use Efficiency

Spatiotemporal Variability and Driving Factors of Tibetan Plateau Water Use Efficiency

2020 ◽  
Vol 125 (22) ◽  
Author(s):  
Shan Lin ◽  
Genxu Wang ◽  
Zhaoyong Hu ◽  
Kewei Huang ◽  
Juying Sun ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Water Use Efficiency ◽  
Water Use ◽  
Driving Factors ◽  
Spatiotemporal Variability ◽  
Use Efficiency
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