Respiratory Effects on the Carbon Isotope Discrimination Near the Compensation Point

Barbour, Margaret M.; Ryazanova, S.V.; Tcherkez, Guillaume

doi:10.1007/978-3-319-68703-2_7

Cited by 14 publications

(20 citation statements)

References 50 publications

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“…Moreover, the phloem contents are dominated by photosynthate produced when A/R d is high. Under these conditions, the respiration effect is small (Barbour, Ryazanova, & Tcherkez, 2017;Tcherkez et al, 2017).…”

Section: Transpiration and Canopy Conductance Estimatesmentioning

confidence: 94%

Estimating canopy gross primary production by combining phloem stable isotopes with canopy and mesophyll conductances

Vernay

Tian

Chi

et al. 2020

Plant Cell & Environment

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Gross primary production (GPP) is a key component of the forest carbon cycle. However, our knowledge of GPP at the stand scale remains uncertain, because estimates derived from eddy covariance (EC) rely on semi-empirical modelling and the assumptions of the EC technique are sometimes not fully met. We propose using the sap flux/isotope method as an alternative way to estimate canopy GPP, termed GPP iso/SF , at the stand scale and at daily resolution. It is based on canopy conductance inferred from sap flux and intrinsic water-use efficiency estimated from the stable carbon isotope composition of phloem contents. The GPP iso/SF estimate was further corrected for seasonal variations in photosynthetic capacity and mesophyll conductance. We compared our estimate of GPP iso/SF to the GPP derived from PRELES, a model parameterized with EC data. The comparisons were performed in a highly instrumented, boreal Scots pine forest in northern Sweden, including a nitrogen fertilized and a reference plot. The resulting annual and daily GPP iso/SF estimates agreed well with PRELES, in the fertilized plot and the reference plot. We discuss the GPP iso/ SF method as an alternative which can be widely applied without terrain restrictions, where the assumptions of EC are not met. K E Y W O R D S boreal forest, intrinsic water-use efficiency, mesophyll conductance, nitrogen fertilization, phloem δ 13 C, PRELES, sap flux, stand transpiration 1 | INTRODUCTION Gross primary production (GPP) represents a key flux in the carbon (C) budget of a forest ecosystem. GPP has been commonly estimated using many approaches, such as eddy covariance (EC), empirical models and upscaling ecophysiological measurements at stand scale

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Section: Transpiration and Canopy Conductance Estimatesmentioning

confidence: 94%

Estimating canopy gross primary production by combining phloem stable isotopes with canopy and mesophyll conductances

Vernay

Tian

Chi

et al. 2020

Plant Cell & Environment

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“…Villar et al ., ). Further data presented during the Workshop also showed a relatively good agreement between Kok‐, Laisk‐ and isotope‐derived R d values in spinach, cocklebur and Magnolia leaves (Barbour et al ., ).…”

Section: Why Is the Kok Effect Of High Significance?mentioning

confidence: 97%

Tracking the origins of the Kok effect, 70 years after its discovery

et al. 2017

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“…Stomatal density and pore size also influence Δ 18 O LW , where greater stomatal densities, even when E remained the same, had higher Δ 18 O LW because L decreased with stomatal density (Sternberg & Manganiello 2014;Larcher et al 2015;Liang et al 2018). These findings have led to increased interest in anatomical features such as cell wall composition that partly control the permeability of the cell wall and, in turn, influence the relative importance of apoplastic water movement from the xylem to the sites of evaporation, which ultimately affectsE and L (Barbour et al 2017b).…”

Section: Introductionmentioning

confidence: 99%

Leaf cell wall properties and stomatal density influence oxygen isotope enrichment of leaf water

Ellsworth

Mertz

Koteyeva

2020

Preprint

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Oxygen isotopic composition (Δ18OLW) of leaf water can help improve our understanding of how anatomy interacts with physiology to influence leaf water transport. Leaf water isotope models of Δ18OLW such as the Péclet effect model have been developed to predict Δ18OLWO, and it incorporates transpiration rate (E) and the mixing length between unenriched xylem water and enriched mesophyll water, which can occur in the mesophyll (L) or veins (L). Here we used two cell wall composition mutants grown under two light intensities and RH to evaluate the effect of cell wall composition on Δ18OLW. In maize (Zea mays), the compromised ultrastructure of the suberin lamellae in the bundle sheath of the ALIPHATIC SUBERIN FERULOYL TRANSFERASE mutant (Zmasft) reduced barriers to apoplastic water movement, resulting in higher E and L and, consequently, lower Δ18OLW. In cellulose synthase-like F6 (Cslf6) mutants and wildtype of rice (Oryza sativa), the difference in Δ18OLW in plants grown under high and low growth light intensity co-varied with their differences in stomatal density. These results show that cell wall composition and stomatal density influence Δ18OLW by altering the Péclet effect and that stable isotopes can facilitate the development of a physiologically and anatomically explicit water transport model.

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Respiratory Effects on the Carbon Isotope Discrimination Near the Compensation Point

Cited by 14 publications

References 50 publications

Estimating canopy gross primary production by combining phloem stable isotopes with canopy and mesophyll conductances

Estimating canopy gross primary production by combining phloem stable isotopes with canopy and mesophyll conductances

Tracking the origins of the Kok effect, 70 years after its discovery

Leaf cell wall properties and stomatal density influence oxygen isotope enrichment of leaf water

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