Estimating intraseasonal intrinsic water‐use efficiency from high‐resolution tree‐ring δ¹³C data in boreal Scots pine forests

Abstract

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Drivers of intra‐seasonal δ13C signal in tree‐rings of Pinus sylvestris as indicated by compound‐specific and laser ablation isotope analysis

“…Hence, we propose/confirm, as hypothesized in Monson et al (2018) and indicated in Tang et al (2023), that it may not be necessary to discard the EW section of δ 13 C chronologies for tree physiological and paleoenvironmental studies, when studying conifers, such as Pinus (this study) and Larix (Rinne, Saurer, Kirdyanov, Loader, et al, 2015), in boreal forests under non‐stressed to mildly stressed conditions. Apart from providing valuable information about the processes occurring during the early part of the growing season, this outcome would also give further confidence for the interpretation of δ 13 C chronologies constructed using the whole annual ring, for example, because of the presence of too narrow LW sections for manual dissection (Vitali et al, 2022).…”

“…Further, it is important to determine how this isotopic offset may vary between sites and species. The two other publications that have combined CSIA of leaf photosynthates with δ 13 C profiling of tree‐rings reported 1.0 and 0.9‰ higher values for δ 13 C Ring_ RE of mature L. gmelinii in central Siberia (Rinne, Saurer, Kirdyanov, Loader, et al, 2015) and mature P. sylvestris in southern Finland (Tang et al, 2023), respectively. There are several factors to consider, when evaluating such offsets in δ 13 C between studies.…”

“…By removing the impact of INV acid on δ 13 C Suc_ Needle in Rinne, Saurer, Kirdyanov, Loader, et al (2015), the difference between δ 13 C Ring_ RE and δ 13 C Suc_ Needle is reduced to 0.4‰, which is similar to our finding (Figure 7). (ii) The magnitude of CO 2 efflux associated isotope fractionation along the pathway from leaves to stem xylem could increase with tree height, potentially leading to a bigger isotopic offset between leaf sugars and tree‐rings for mature trees, for example in Tang et al (2023). (iii) When using mature trees for studying post‐photosynthetic 13 C‐fractionation, it can be challenging to obtain canopy‐representative CSIA results, considering that δ 13 C P is dependent on the incident solar energy received by the leaves (Bögelein et al, 2019; Schleser, 1989).…”

“…Conifers, on the other hand, have several existing needle generations or, in the case of deciduous larch, bud burst typically occurs before the start of stem growth, providing fresh assimilates for cell formation (Rinne, Saurer, Kirdyanov, Loader, et al, 2015). Congruently, the studies that have followed δ 13 C signal from bulk water‐soluble carbohydrates (WSCs, δ 13 C WSC ) ( Pinus sylvestris , Gessler, Brandes, et al, 2009) or individual sugars ( Larix gmelinii , Rinne, Saurer, Kirdyanov, Loader, et al, 2015) ( P. sylvestris , Tang et al, 2023) to δ 13 C Ring have found a close correspondence in intra‐seasonal δ 13 C trends between the two carbon pools. However, there is currently no consensus on the suitability of EW of boreal conifers for environmental studies (Fonti et al, 2018; Kagawa et al, 2006; Kress et al, 2009).…”

Fast Recovery of Suppressed Norway Spruce Trees after Selection Harvesting on a Drained Peatland Forest Site

“…Trees C5 and H2 were excluded from the analysis due to broken increment cores that did not allow ring width analysis. For δ 13 C, the analysis of 5 trees was considered adequate for the representative reconstruction of environmental variability from tree rings (Leavitt and Long, 1984;Robertson et al, 1997;Tang et al, 2022). The diameter of the trees varied between 7.9 cm and 15 cm, while the height varied between 6.6 m and 12.3 m (Table 1).…”