The responses of Scots pine seedlings to waterlogging in a fine-textured till soil

Repo, Tapani; Heiskanen, Juha; Sutinen, Marja‐Liisa; Sutinen, Raimo; Lehto, Tarja

doi:10.1007/s11056-016-9555-3

Cited by 14 publications

(9 citation statements)

References 38 publications

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“…the ratio of CO 2 concentration inside and outside the leaves) and thus decreased the riparian relative to upland δ 13 C values since the HLL event. These findings agree with previously suggested nonstomatal limitations for reduced assimilation capacity (Repo et al., ) and functioning of photosynthetic machinery in waterlogged P. sylvestris seedlings (Lotocki, ; Repo et al., ). Waterlogging is also known to reduce sap flow and needle water content in P. sylvestris seedlings (Repo et al., , ) as the oxygen restricted conditions progress to affect the plants with reductions in root hydraulic conductivity (Parent et al., ).…”

Section: Discussionsupporting

confidence: 93%

“…These findings agree with previously suggested nonstomatal limitations for reduced assimilation capacity (Repo et al., ) and functioning of photosynthetic machinery in waterlogged P. sylvestris seedlings (Lotocki, ; Repo et al., ). Waterlogging is also known to reduce sap flow and needle water content in P. sylvestris seedlings (Repo et al., , ) as the oxygen restricted conditions progress to affect the plants with reductions in root hydraulic conductivity (Parent et al., ). Albeit the stomatal closure may well be pivotal in this process (Sojka, ), its role in determining the c i / c a and correspondingly tree‐ring δ 13 C appears subordinate to the control of reduced assimilation rate.…”

Section: Discussionsupporting

confidence: 93%

“…the ratio of CO 2 concentration inside and outside the leaves) and thus decreased the riparian relative to upland d 13 C values since the HLL event. These findings agree with previously suggested nonstomatal limitations for reduced assimilation capacity (Repo et al, 2016) and functioning of photosynthetic machinery in waterlogged P. sylvestris seedlings (Lotocki, 1977;Repo et al, 2017).…”

Section: Ecophysiological and Growth Responsessupporting

confidence: 93%

“…Yet, the negative feedbacks from flooding and waterlogging to stomatal conductance, net assimilation and photosynthesis, as recently reported for P. sylvestris seedlings (Repo et al., , ), must have affected our δ 13 C data. In accordance with the Farquhar models of carbon isotope fractionation (Farquhar et al., ; Francey & Farquhar, ), such feedbacks could have either increased (through diminished stomatal conductance) and/or decreased (through reduced carbon assimilation) the tree‐ring δ 13 C values.…”

Section: Discussionmentioning

confidence: 71%

“…First, although tree-ring chronologies of P. sylvestris have previously been developed for studying the tree growth variability in boreal lakeshore and control stands (D€ uthorn, Holzk€ amper, Timonen, & Esper, 2013;D€ uthorn, Schneider, G€ unther, Gl€ aser, & Esper, 2016;D€ uthorn et al, 2015;Helama et al, 2013;Linderholm et al, 2014), there is a critical lack of d 13 C data to delve into the ecophysiological processes and their external drivers. Here we emphasize the value of using such data to derive indications of anomalies in stomatal conductance and assimilation that may be generally affected from changing water level (Kozlowski, 1984;Parent et al, 2008;Sojka, 1992;Wang et al, 2017) as having been previously reported also for P. sylvestris seedlings (Lotocki, 1977;Repo, Heiskanen, Sutinen, Sutinen, & Lehto, 2017;Repo et al, 2016). Second, the previous chronologies have formerly relied on dimensionless tree-ring indices that are a result of traditional dendrochronological methods of tree-ring standardization.…”

Section: Introductionmentioning

confidence: 78%

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Arctic moistening provides negative feedbacks to riparian plants

Helama

Arppe

Mielikäinen

et al. 2018

Global Change Biology

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Arctic moistening will affect the circumpolar forested riparian ecosystems. Upward trends observed for precipitation in high latitudes illustrate that the moistening may be underway to influence the woody biomass production near the inland waters, lakes and streams with effects on carbon pools and fluxes. Although the flooding and waterlogging tolerance of seedlings has been investigated, our understanding of responses in mature trees is still limited. Here we employ tree-ring δ C and width data from a subarctic riparian setting in Lapland, where artificially high lake level (HLL) has already altered the ecophysiological and growth responses of riparian Pinus sylvestris trees to external drivers under conditions simulating moister environment. Prior to the HLL event, the carbon assimilation rate was primarily limited by irradiance as reflected in the δ C data and the radial growth of south-facing riparian trees remained increased in comparison to shaded upland trees. By contrast, the riparian trees were not similarly benefited during the HLL period when reduced assimilation depleted the riparian in comparison to upland δ C despite of increased irradiance. As a result, the radial growth of riparian trees was markedly reduced over the HLL event while the upland trees benefited from increased irradiance and summer time warming. Although the production of biomass at high latitudes is commonly considered temperature-limited, our results highlight the increasing role of Arctic moistening to limit the growth when increased precipitation (cloudiness) reduces the incoming solar radiation in general and when the riparian habitat becomes increasingly waterlogged in particular. The effects of high-latitude warming to induce higher biomass productivity may be restricted by negative feedbacks.

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