Temporal and spatial diurnal dynamics of the hysteresis of weighed transpiration and water transport in tomatoes

Ma, Lukai; He, Jiaxing; Li, Jianming

doi:10.1016/j.envexpbot.2023.105238

Cited by 2 publications

(1 citation statement)

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“…Driven by solar radiation and atmospheric water demand, plants absorb water from the soil, transport the water through the xylem, and ultimately transpire them into the atmosphere through plants' stomata (Li et al., 2022). From such perspective, the hysteresis is supposed to be driven by the transportation time of water from soil to leaves and the corresponding response to the environmental conditions (Ma et al., 2023). In particular, plant hydraulic resistance exacerbates the delay in plant water transportation (Rodriguez‐Dominguez & Brodribb, 2020; Scoffoni et al., 2017), and plant hydraulic features also regulate sap flux when plants are confronted with higher transpiration demand (Katul et al., 2012).…”

Section: Introductionmentioning

confidence: 99%

A Novel Crossed Hysteresis Response Pattern of Sap Flux to Solar Radiation

Wan,

Zhang,

Arain

et al. 2024

JGR Biogeosciences

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The hysteresis response of tree sap flux (SF) to its main driving factor of incoming short‐wave radiation (Rsi) has been widely reported, affecting the accuracy of sap flux and transpiration estimates in forest ecosystems. The diurnal cycle of SF usually lags the Rsi cycle by certain hours, thereby generating a closed counterclockwise hysteresis pattern. However, a few studies have reported that diurnal SF cycle may advance Rsi cycle, and such a response pattern has not been fully explored. In this study, we reported a rarely seen crossed hysteresis response pattern of SF to Rsi in 1/3 trees of a young temperate pine forest. We found that the diurnal SF cycle advances Rsi cycle especially in the morning induced by the early stomatal closure, thereby generating the crossed hysteresis response of SF to Rsi. We also proposed a method to quantify the magnitude of hysteresis (Ahys) for both the crossed and closed hystereses. Our analysis suggests that a lower Ahys of two time series results in (a) a larger crossing degree of hysteresis, and (b) a stronger linear correlation between the two time series. The seasonal variation of soil water content can explain the variation in Ahys for the hysteresis response of SF to Rsi, and the crossed hysteresis of SF is more likely to occur under water stress conditions. This study contributes to advancing our understanding of forest transpiration and how forests may respond to drought stress, which are expected to become more frequent and longer under future climate change.

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