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Environmental Earth Sciences

Erschienen in:

01.05.2012 | Original Article

Groundwater depth affects the daily course of gas exchange parameters of Populus euphratica in arid areas

verfasst von: Yapeng Chen, Yaning Chen, Changchun Xu, Weihong Li

Erschienen in: Environmental Earth Sciences | Ausgabe 2/2012

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Abstract

In this case study, the diurnal courses of gas exchange in Populus euphratica at different groundwater depths in the lower reaches of Tarim River were investigated to understand the effects of soil hydrology on photosynthesis and water use efficiency (WUE) of vegetation in arid desert area. It was found that the photosynthetic rate (P _N) was not sensitive to the change of groundwater depth (GD) within the range of 4.2–6.8 m. Compared to stomatal conductance (g _s) and transpiration rate (E) of P. euphratica grown at GD 4.2, 5.6 and 5.8 m, g _s and E at GD 6.8 m both markedly declined in June, suggesting that P. euphratica at deeper GD can avoid overall water loss by stomatal adjustment. The intrinsic water use efficiency of P. euphratica first decreases with the increasing GD, but when GD increased to 6.8 m, intrinsic WUE increased by 1.2–2.2 fold, compared with the WUE of P. euphratica at GD 4.2–5.8 m, indicating that intrinsic WUE of P. euphratica will increase when the plant suffers from moderate drought stress.

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Titel: Groundwater depth affects the daily course of gas exchange parameters of Populus euphratica in arid areas
verfasst von: Yapeng Chen
Yaning Chen
Changchun Xu
Weihong Li
Publikationsdatum: 01.05.2012
Verlag: Springer-Verlag
Erschienen in: Environmental Earth Sciences / Ausgabe 2/2012
Print ISSN: 1866-6280
Elektronische ISSN: 1866-6299
DOI: https://doi.org/10.1007/s12665-011-1250-2

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