Studies on forest ecosystem physiology: marginal water-use efficiency of a tropical, seasonal, evergreen forest in Thailand

Mengping Chen, Guanze Wang, Shuangxi Zhou, Junfu Zhao, Xiang Zhang, Chunsheng He, Yongjiang Zhang, Liang Song, Zhenghong Tan*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    3 Citations (Scopus)

    Abstract

    Marginal water-use efficiency plays a critical role in plant carbon–water coupling relationships. We investigated the ecosystem marginal water-use efficiency (λ) of a tropical seasonal evergreen forest to (1) determine the general pattern of λ across time, (2) compare different models for calculating λ, and (3) address how λ varies with soil water content during different seasons. There was a U-shaped diurnal pattern in λ, which was higher in the early morning and late afternoon. At other times of the day, λ was lower and remained constant. Ecosystem λ was higher in the wet season than in the dry season. All three models successfully captured the diurnal and seasonal patterns of λ but differed in the calculated absolute values. The idea that λ is constant on a subdaily scale was partly supported by our study, while a constant λ was only true when data from the early morning and late afternoon were not included. The λ increases with soil water content on a seasonal scale, possibly because early morning λ remained low in dry conditions when the soil water content was low.

    Original languageEnglish
    Pages (from-to)2163-2173
    Number of pages11
    JournalJournal of Forestry Research
    Volume30
    Issue number6
    DOIs
    Publication statusPublished - Dec 2019

    Keywords

    • Canopy conductance
    • Photosynthesis model
    • Soil moisture
    • Stomatal optimization

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