Quantifying Soil Moisture Impacts on Water Use Efficiency in Terrestrial Ecosystems of China

Soil moisture (SM) significantly affects the exchange of land surface energy and the stability of terrestrial ecosystems. Although some conclusions have been drawn about the effects of SM on the ecosystem water use efficiency (WUE), the influe...

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Autores principales:	Xingming Hao, Jingjing Zhang, Xue Fan, Haichao Hao, Yuanhang Li
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	feedback relationship evaporation fraction net primary production (NPP) elasticity coefficient climatic zone Science Q
Acceso en línea:	https://doaj.org/article/758e4dfcad4a44beaf6106f0fcd3751c
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spelling	oai:doaj.org-article:758e4dfcad4a44beaf6106f0fcd3751c2021-11-11T18:51:49ZQuantifying Soil Moisture Impacts on Water Use Efficiency in Terrestrial Ecosystems of China10.3390/rs132142572072-4292https://doaj.org/article/758e4dfcad4a44beaf6106f0fcd3751c2021-10-01T00:00:00Zhttps://www.mdpi.com/2072-4292/13/21/4257https://doaj.org/toc/2072-4292Soil moisture (<i>SM</i>) significantly affects the exchange of land surface energy and the stability of terrestrial ecosystems. Although some conclusions have been drawn about the effects of <i>SM</i> on the ecosystem water use efficiency (<i>WUE</i>), the influence mechanism and the quantitative assessment framework of <i>SM</i> on <i>WUE</i> are still unclear. This study provides an analysis framework for the feedback relationship between <i>SM</i> and <i>WUE</i> based on the dependence of the evaporation fraction on <i>SM</i> and output datasets from remote sensing and the Global Land Data Assimilation System. The results show that the range of <i>WUE</i> of terrestrial ecosystems of China was 0.02–19.26 g C/kg H<sub>2</sub>O in the growing season with an average value of 1.05 g C/kg H<sub>2</sub>O. They also show a downward trend in 43.99% of the total area. In the evapotranspiration (<i>ET</i>) pathway, SM negatively affected <i>WUE</i>, and the sensitivity coefficient ranged from −18.49 to −0.04. In the net primary production (<i>NPP</i>) pathway, the sensitivity coefficient ranged from −68.66 to 43.19. Under the dual effects of the <i>ET</i> and <i>NPP</i> pathways, the influence of <i>SM</i> on <i>WUE</i> was negative in 84.62% of the area. Variation in <i>SM</i> led to significant <i>WUE</i> variability. Generally, the percentage change in <i>WUE</i> (Δ<i>WUE</i>) ranged from 0% to 190.86%, with an average value of 28.02%. The maximum Δ<i>WUE</i> ranged from 0% to 758.78%, with an average value of 109.29%. The <i>WUE</i> of forest ecosystems showed strong resistance to <i>SM</i> variation, whereas that of non-forest vegetation was more sensitive to <i>SM</i> variation. This analytical framework provides a new perspective on the feedback relationship between <i>WUE</i> and <i>SM</i> in terrestrial ecosystems.Xingming HaoJingjing ZhangXue FanHaichao HaoYuanhang LiMDPI AGarticlefeedback relationshipevaporation fractionnet primary production (NPP)elasticity coefficientclimatic zoneScienceQENRemote Sensing, Vol 13, Iss 4257, p 4257 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	feedback relationship evaporation fraction net primary production (NPP) elasticity coefficient climatic zone Science Q
spellingShingle	feedback relationship evaporation fraction net primary production (NPP) elasticity coefficient climatic zone Science Q Xingming Hao Jingjing Zhang Xue Fan Haichao Hao Yuanhang Li Quantifying Soil Moisture Impacts on Water Use Efficiency in Terrestrial Ecosystems of China
description	Soil moisture (<i>SM</i>) significantly affects the exchange of land surface energy and the stability of terrestrial ecosystems. Although some conclusions have been drawn about the effects of <i>SM</i> on the ecosystem water use efficiency (<i>WUE</i>), the influence mechanism and the quantitative assessment framework of <i>SM</i> on <i>WUE</i> are still unclear. This study provides an analysis framework for the feedback relationship between <i>SM</i> and <i>WUE</i> based on the dependence of the evaporation fraction on <i>SM</i> and output datasets from remote sensing and the Global Land Data Assimilation System. The results show that the range of <i>WUE</i> of terrestrial ecosystems of China was 0.02–19.26 g C/kg H<sub>2</sub>O in the growing season with an average value of 1.05 g C/kg H<sub>2</sub>O. They also show a downward trend in 43.99% of the total area. In the evapotranspiration (<i>ET</i>) pathway, SM negatively affected <i>WUE</i>, and the sensitivity coefficient ranged from −18.49 to −0.04. In the net primary production (<i>NPP</i>) pathway, the sensitivity coefficient ranged from −68.66 to 43.19. Under the dual effects of the <i>ET</i> and <i>NPP</i> pathways, the influence of <i>SM</i> on <i>WUE</i> was negative in 84.62% of the area. Variation in <i>SM</i> led to significant <i>WUE</i> variability. Generally, the percentage change in <i>WUE</i> (Δ<i>WUE</i>) ranged from 0% to 190.86%, with an average value of 28.02%. The maximum Δ<i>WUE</i> ranged from 0% to 758.78%, with an average value of 109.29%. The <i>WUE</i> of forest ecosystems showed strong resistance to <i>SM</i> variation, whereas that of non-forest vegetation was more sensitive to <i>SM</i> variation. This analytical framework provides a new perspective on the feedback relationship between <i>WUE</i> and <i>SM</i> in terrestrial ecosystems.
format	article
author	Xingming Hao Jingjing Zhang Xue Fan Haichao Hao Yuanhang Li
author_facet	Xingming Hao Jingjing Zhang Xue Fan Haichao Hao Yuanhang Li
author_sort	Xingming Hao
title	Quantifying Soil Moisture Impacts on Water Use Efficiency in Terrestrial Ecosystems of China
title_short	Quantifying Soil Moisture Impacts on Water Use Efficiency in Terrestrial Ecosystems of China
title_full	Quantifying Soil Moisture Impacts on Water Use Efficiency in Terrestrial Ecosystems of China
title_fullStr	Quantifying Soil Moisture Impacts on Water Use Efficiency in Terrestrial Ecosystems of China
title_full_unstemmed	Quantifying Soil Moisture Impacts on Water Use Efficiency in Terrestrial Ecosystems of China
title_sort	quantifying soil moisture impacts on water use efficiency in terrestrial ecosystems of china
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/758e4dfcad4a44beaf6106f0fcd3751c
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Quantifying Soil Moisture Impacts on Water Use Efficiency in Terrestrial Ecosystems of China

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