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Seasonal transpiration dynamics and water use strategy of a farmland shelterbelt in Gurbantunggut Desert oasis, northwestern China

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  • Xue, Bing
  • Jiang, Yan
  • Wang, Qijie
  • Ma, Bin
  • Hou, Zhen’an
  • Liang, Xue
  • Cui, Yirui
  • Li, Fangfang

Abstract

Farmland shelterbelts provide an ecological barrier to oases, but their growth is inhibited or even dies under water scarcity. Therefore, it is necessary to understand the response of farmland shelterbelts to environmental changes for their own survival in order to promote the long-term healthy development of agroforestry systems and improve water management in oases in the northwest arid region. In this study, we measured the sap flow and environmental factors to determine the transpiration dynamics and its influencing factors. The seasonal variations in water use strategy of Populus alba var. pyramidalis Bunge were identified by using stable isotopes of δ18O in xylem, soil water and groundwater coupled with the Iso-Source model. The results showed that the transpiration of the populus was significantly higher in the growing season (more than 80% of the total transpiration) than in the non-growing season, and the transpiration was closely related to air temperature, vapor pressure deficit, soil water content, and soil temperature. The water use strategy had seasonal variations. The populus obtained water predominantly from 0–40 cm soil water (approximately 75%) in the wet spring and then switched to deeper water sources (40–150 cm soil water and groundwater) as the season progressed. The contribution of deeper water sources increased to 84–92% in summer and autumn. This suggested that Populus alba var. pyramidalis Bunge has ecological plasticity, as it could explore deeper water sources as the water stress increased. The ability to switch rapidly among different water sources could put a plant at an advantage if competition for water occurs within the ecosystem. Our findings can provide insights into temporal transpiration dynamics as well as the strategy adopted by farmland shelterbelts to counteract the drought stress associated with the shallow soils in desert oasis ecosystems.

Suggested Citation

  • Xue, Bing & Jiang, Yan & Wang, Qijie & Ma, Bin & Hou, Zhen’an & Liang, Xue & Cui, Yirui & Li, Fangfang, 2024. "Seasonal transpiration dynamics and water use strategy of a farmland shelterbelt in Gurbantunggut Desert oasis, northwestern China," Agricultural Water Management, Elsevier, vol. 295(C).
    • Handle: RePEc:eee:agiwat:v:295:y:2024:i:c:s0378377424001124
    DOI: 10.1016/j.agwat.2024.108777
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    References listed on IDEAS

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    1. Deng, Jifeng & Yao, Jiaqi & Zheng, Xiao & Gao, Guanglei, 2021. "Transpiration and canopy stomatal conductance dynamics of Mongolian pine plantations in semiarid deserts, Northern China," Agricultural Water Management, Elsevier, vol. 249(C).
    2. Fu, Shuai & Sun, Lin & Luo, Yi, 2016. "Combining sap flow measurements and modelling to assess water needs in an oasis farmland shelterbelt of Populus simonii Carr in Northwest China," Agricultural Water Management, Elsevier, vol. 177(C), pages 172-180.
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