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Characteristics of ecosystem water use efficiency in a desert riparian forest

  • Xiaohong Ma
  • Qi Feng
  • Yonghong Su
  • Tengfei Yu
  • Ravinesh C. Deo
Original Article

Abstract

The Ejin oasis, located on the river sides of a hyper-arid region, represents some of the richest desert ecosystems, populated with riparian forest. Water availability is the main limited factors for the distribution and growth of the forest. Currently, the water–carbon process and mechanisms in the desert riparian forest remain uncertain. The study investigated the seasonal and inter-annual variations in the gross primary productivity (GPP), evapotranspiration (ET) and ecosystem water use efficiency (WUE), and their relationships with the event (e.g., irrigation) and climatic factors. The results showed that the desert riparian forest produced new plant biomass with 0.79 g C kg−1 of water loss during the growing season. In the study period, monthly GPP and ET was tightly coupled, and the mean cumulative GPP and ET from May–October were 676 g C m−2 and 864 mm, respectively. Daily GPP and ET had similar relationships with global radiation (Rg), air temperature (Ta) and vapor pressure deficit at monthly scale. Consequently, the seasonal variations in WUE were not obvious in the growing season, except in September. In September, the value of WUE decreased significantly with an increase in Ta (for Ta > 15 °C) after irrigation, which was attributable to the increased ET and a relatively steady GPP. It is possible that the time of irrigation is able to affect the seasonal course of WUE. The study has implications that enable more rational water management to maintain the the health and activities of the riparian forest in such a hyper-arid region.

Keywords

Ecosystem water use efficiency The desert riparian forest Irrigation effects 

Notes

Acknowledgements

This work was supported by National Key R&D Program of China (2017YFC0404305). This work also was funded by the National Natural Science Foundation of China (Nos. 31370467 and 41401033). The authors thank anonymous referees for their reading of this manuscript and helpful reviews and comments.

Author contributions

Xiaohong Ma analyzed data and wrote the paper; Qi Feng conceived the study; Yonghong Su and Ravinesh Deo revised the paper; Tengfei Yu collected data and also revised the paper.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Northwest Institute of Eco-Environment and Resources, CASLanzhouChina
  2. 2.Key Laboratory of Eco-hydrology of Inland River Basin, CASLanzhouChina
  3. 3.University of Chinese Academy of SciencesBeijingChina
  4. 4.School of Agricultural, Computational and Environmental Sciences, International Centre for Applied Climate Sciences (ICACS), Institute of Agriculture and Environment (IAg&E)University of Southern QueenslandSpringfieldAustralia

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