Biophysical controls on energy exchange and water use efficiency over a poplar plantation in Northern Hilly China

Yini Han, Songheng Jin, Wenjing Chen, Misha Zhan, Zheng Yuan, Xiao Wang and Shangbin Bai

Agricultural Water Management, 2022, vol. 273, issue C

Abstract: During the last decades, the artificial afforestation is expanding in the northern China, understanding their ecological function has been of scientific interest. In this study, we explored how surface energy-balance components vary at seasonal and annual scales, and how biophysical factors control bulk surface parameters and energy exchange over a poplar plantation using the eddy-covariance measurements during 2016–2018. The plantation was characterized with a dry surface where available water played a dominant role in controlling energy partitioning. Annually, sensible heat flux (H) exceeded latent heat flux (λE) for most of the years, resulting in annual Bowen ratio (β) of 1.31–1.74. Seasonally within the year, variations of evaporative fraction (EF), Priestley-Taylor coefficient (α), surface conductance (gs) and decoupling coefficient (Ω) was significant different between drought and wet periods. The enhancement of λE by high vapor pressure deficit (VPD) was buffered by a concurrent suppression of gs which played a direct role in controlling energy partitioning. During dry periods, soil water availability restrained the atmospheric evaporative demand controls on water and energy exchange. High ET/precipitation (P) (>1) indicated high water consumption of the plantation, which increased local water deficit. Our results highlight the limitation of poplar water use, supply and energy partitioning in current water conditions and suggest more deliberation in species selection for afforestation in this area.

Keywords: Energy partitioning; Sensible heat flux; Latent heat flux; Surface bulk parameters; Poplar plantation, afforestation (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S037837742200467X
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:agiwat:v:273:y:2022:i:c:s037837742200467x

DOI: 10.1016/j.agwat.2022.107920

Access Statistics for this article

Agricultural Water Management is currently edited by B.E. Clothier, W. Dierickx, J. Oster and D. Wichelns

More articles in Agricultural Water Management from Elsevier
Bibliographic data for series maintained by Catherine Liu ().