Evapotranspiration and crop coefficient of Populus euphratica Oliv forest during the growing season in the extreme arid region northwest China

Hou, Lan-gong; Xiao, Hu; Si, Jing; Xiao, Suguang; Zhou, Mengzi; Yang, Yawen

doi:10.1016/j.agwat.2009.09.022

Cited by 51 publications

(32 citation statements)

References 15 publications

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“…forest (Hou et al, 2010). Additionally, our study showed that K c fluctuated more dramatically in DBF, GRA, and MF than other land covers in different seasons (Table 1).…”

Section: Modeling the Dynamics Of K Cmentioning

confidence: 75%

“…ecosystems, such as a P. euphratica forest in the riparian area (Hou et al, 2010) in a desert environment, a watermelon crop covered with plastic mulch in Florida (Shukla et al, 2014a, b), soybean in Nebraska (Irmak et al, 2013b), and a temperate desert steppe in Inner Mongolia (Zhang et al, 2012). As Fig.…”

Section: Crop Coefficient Variation In Different Seasonsmentioning

confidence: 99%

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Environmental controls on seasonal ecosystem evapotranspiration/potential evapotranspiration ratio as determined by the global eddy flux measurements

Liu

Sun

McNulty

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. The evapotranspiration / potential evapotranspiration (AET / PET) ratio is traditionally termed as the crop coefficient (K c ) and has been generally used as ecosystem evaporative stress index. In the current hydrology literature, K c has been widely used as a parameter to estimate crop water demand by water managers but has not been well examined for other types of ecosystems such as forests and other perennial vegetation. Understanding the seasonal dynamics of this variable for all ecosystems is important for projecting the ecohydrological responses to climate change and accurately quantifying water use at watershed to global scales. This study aimed at deriving monthly K c for multiple vegetation cover types and understanding its environmental controls by analyzing the accumulated global eddy flux (FLUXNET) data. We examined monthly K c data for seven vegetation covers, including open shrubland (OS), cropland (CRO), grassland (GRA), deciduous broad leaf forest (DBF), evergreen needle leaf forest (ENF), evergreen broad leaf forest (EBF), and mixed forest (MF), across 81 sites. We found that, except for evergreen forests (EBF and ENF), K c values had large seasonal variation across all land covers. The spatial variability of K c was well explained by latitude, suggesting site factors are a major control on K c . Seasonally, K c increased significantly with precipitation in the summer months, except in EBF. Moreover, leaf area index (LAI) significantly influenced monthly K c in all land covers, except in EBF. During the peak growing season, forests had the highest K c values, while croplands (CRO) had the lowest. We developed a series of multivariate linear monthly regression models for K c by land cover type and season using LAI, site latitude, and monthly precipitation as independent variables. The K c models are useful for understanding water stress in different ecosystems under climate change and variability as well as for estimating seasonal ET for large areas with mixed land covers.

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“…forest (Hou et al, 2010). Additionally, our study showed that K c fluctuated more dramatically in DBF, GRA, and MF than other land covers in different seasons (Table 1).…”

Section: Modeling the Dynamics Of K Cmentioning

confidence: 75%

Section: Crop Coefficient Variation In Different Seasonsmentioning

confidence: 99%

Environmental controls on seasonal ecosystem evapotranspiration/potential evapotranspiration ratio as determined by the global eddy flux measurements

Liu

Sun

McNulty

et al. 2017

Hydrol. Earth Syst. Sci.

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“…White poplar: adapted from [49]. Euphrates poplar: adapted from [50].) Crop coefficients for the frost months have been reduced from the 0.2 proposed as general values by [45] down to 0.1, taking the extremely arid conditions of the specific locality into account.…”

Section: Methodsmentioning

confidence: 99%

Trading Natural Riparian Forests for Urban Shelterbelt Plantations—A Sustainability Assessment of the Kökyar Protection Forest in NW China

Missall

Abliz

Halik

et al. 2018

Water

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Cities at the fringe of the Taklimakan desert in NW China are prone to dust and sand storms with serious consequences for human well-being. The Kökyar Protection Forest was established in the 1980s as an ecological engineering project with the intent of protecting the city of Aksu, NW China, from these impacts. It is designed as a combination of poplar shelterbelts and orchards, irrigated by river water from the Aksu River, the main tributary of the Tarim River. Prevalent literature describes it as an afforestation project for combatting desertification with manifold positive effects for the economic, social, and environmental dimension of sustainable development. This paper sets out to challenge these claims by a sustainability assessment in which the plantation is examined from a broader perspective, embedding it to the wider context of social and environmental problems in South Xinjiang. Methods comprise evapotranspiration calculations, interviews, a socioeconomic household survey, stakeholder dialogues, and literature research. Results affirm its economic sustainability, but see a mixed record for the social sphere. From the nature conservation point of view, it has to be classified as unsustainable because its high irrigation water consumption results in the downstream desiccation and desertification of natural riparian forests along the Tarim River, causing a forest loss in the downstream area twice the size of the forest gain in the upstream area. There is a trade-off between artificial shelterbelt plantations for urban ecosystem services on the one hand side, and natural riparian forests and their biodiversity on the other hand side. The paper recommends restricting agricultural extension, and using locally adapted less water consuming agroforestry schemes to protect urban dwellers from dust stress.

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“…Allen et al (1998) suggest accurate evapotranspiration observed experimentally during years multiples. The Kc values has been experimentally obtained using the evapotranspiration derived from micrometeorologicals methods such as Bowen Ratio Energy Balance (BREB) (Inmam-Bamber & McGlinchey, 2003;Hou et al, 2010;Bezerra et al, 2010) …”

Section: Crop Coefficient (K C )mentioning

confidence: 99%

Crop Evapotranspiration and Water Use Efficiency

Bezerra¹

2012

Irrigation Systems and Practices in Challenging Environments

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Evapotranspiration and crop coefficient of Populus euphratica Oliv forest during the growing season in the extreme arid region northwest China

Cited by 51 publications

References 15 publications

Environmental controls on seasonal ecosystem evapotranspiration/potential evapotranspiration ratio as determined by the global eddy flux measurements

Environmental controls on seasonal ecosystem evapotranspiration/potential evapotranspiration ratio as determined by the global eddy flux measurements

Trading Natural Riparian Forests for Urban Shelterbelt Plantations—A Sustainability Assessment of the Kökyar Protection Forest in NW China

Crop Evapotranspiration and Water Use Efficiency

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