Variation in White spruce needle respiration at the species range limits: A potential impediment to Northern expansion

Griffin, Kevin L.; Griffin, Zoe M.; Schmiege, Stephanie C.; Bruner, Sarah G.; Boelman, Natalie T.; Vierling, Lee A.; Eitel, Jan U. H.

doi:10.1111/pce.14333

Cited by 4 publications

(13 citation statements)

References 96 publications

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“…Tree characteristics for the trees measured in this study have been previously reported in Griffin et al . (2022) but have been summarized in Table 1.…”

Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 99%

“…Ratios of (a) maximum rate of carboxylation to respiration at 25°C from Griffin et al . (2022) ( V cmax / R 25 ) and (b) maximum electron transport rate to respiration at 25°C from Griffin et al . (2022) ( J max / R 25 ) of white spruce from high and low canopy positions at the Forest Tundra Ecotone (FTE, blue), Alaska, and Black Rock Forest (BRF, green), New York.…”

Section: Resultsmentioning

confidence: 99%

“…Finally, in addition to biochemical differences between locations, metabolic differences are key in understanding the mechanisms controlling the range limits of this species. White spruce has been found to have extremely high rates of dark respiration at its northern compared to southern range limit, a finding that has led to the conclusion that respiratory carbon loss may be a crucial factor constraining the northern range limit of this species Griffin et al . (2022).…”

Section: Discussionmentioning

confidence: 99%

“…Carbon balance at the range extremes of white spruce: The collection of gas exchange parameters such as V cmax and J max , which are commonly used to predict photosynthesis, together with values of respiration at 25°C (R 25 ) previously reported by Griffin et al (2022), provide a unique opportunity to examine the carbon balance across the range extremes of white spruce.…”

Section: Relationships Between Light Environment and Gas Exchange Bio...mentioning

confidence: 99%

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Vertical gradients in photosynthetic physiology diverge at the latitudinal range extremes of white spruce

Schmiege

Griffin

Boelman

et al. 2022

Preprint

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Light availability drives vertical canopy gradients in photosynthetic functioning and carbon (C) balance, yet patterns of variability in these gradients remain unclear. We measured light availability, photosynthetic CO2 and light response curves, foliar C, nitrogen (N) and pigment concentrations, and the photochemical reflectance index (PRI) on upper and lower canopy needles of white spruce trees (Picea glauca) at the northern and southern extremes of the species range. We combined our photosynthetic data with previously published respiratory data to compare and contrast canopy C balance between latitudinal extremes. We found steep canopy gradients in irradiance, photosynthesis, and leaf traits at the southern range limit, but clear convergence across canopy positions at the northern range limit. Thus, unlike many tree species from tropical to mid-latitude forests, high latitude trees do not require vertical gradients of metabolic activity to optimize photosynthetic C gain. Consequently, accounting for self-shading is less critical for predicting gross primary productivity at northern relative to southern latitudes. Northern trees also had a significantly smaller net positive C balance than southern trees suggesting that, regardless of canopy position, low photosynthetic rates coupled with high respiratory costs may ultimately constrain the northern range limit of this widely distributed boreal species.

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“…Tree characteristics for the trees measured in this study have been previously reported in Griffin et al . (2022) but have been summarized in Table 1.…”

Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Relationships Between Light Environment and Gas Exchange Bio...mentioning

confidence: 99%

See 3 more Smart Citations

Vertical gradients in photosynthetic physiology diverge at the latitudinal range extremes of white spruce

Schmiege

Griffin

Boelman

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

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It's only natural: Plant respiration in unmanaged systems

2023

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Respiration plays a key role in the terrestrial carbon cycle and is a fundamental metabolic process in all plant tissues and cells. We review respiration from the perspective of plants that grow in their natural habitat and how it is influenced by wide-ranging elements of different scales, from metabolic substrate availability to shifts in climate. Decades of field-based measurements have honed our understanding of the biological and environmental controls on leaf, root, stem, and whole-organism respiration. Despite this effort, there remain gaps in our knowledge within and across species and ecosystems, especially in more challenging-to-measure tissues like roots. Recent databases of respiration rates and associated leaf traits from species representing diverse biomes, plant functional types, and regional climates have allowed for a wider-lens view at modeling this important CO2 flux. We also re-analyze published datasets to show that maximum leaf respiration rates (Rmax) in species from around the globe are related both to leaf economic traits and environmental variables (precipitation, air temperature), but that root respiration does not follow the same latitudinal trends previously published for leaf data. We encourage the ecophysiological community to continue to expand their study of plant respiration in tissues that are difficult to measure and at the whole plant and ecosystem levels to address outstanding questions in the field.

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Growth increases but regeneration declines in response to warming and drying at Arctic treeline in white spruce (Picea glauca)

Jensen

Boelman

Eitel

et al. 2023

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As a temperature-delineated boundary, the Arctic treeline is predicted to shift northward in response to warming. However, the evidence for northward movement is mixed, with some sections of the treeline advancing while others remain stationary or even retreat. To identify the drivers of this variation, we need a landscape-level understanding of the interactions occurring between climate, tree growth, and population regeneration. In this study, we assessed regeneration alongside annual tree growth and climate during the 20th century. We used an age-height model combined with tree height from aerial lidar to predict the age structure of 38,652 white spruce trees across 250 ha of Arctic treeline in the central Brooks Range, Alaska, USA. We then used age structure analysis to interpret the trends in regeneration and tree-ring analysis to interpret changes in annual tree growth. The climate became significantly warmer and drier circa 1975, coinciding with divergent responses of regeneration and tree growth. After 1975, regeneration of saplings (trees ≤ 2m tall) decreased compared to previous decades whereas annual growth in mature trees (trees >2m tall) increased by 54% (p<0.0001, Wilcoxon test). Tree-ring width was positively correlated with May-August temperature (p<0.01, Pearson coefficient) during the 20th century. However, after circa 1950, the positive correlation between temperature and growth weakened (i.e., temperature divergence) while the positive correlation with July precipitation strengthened (p<0.01, Pearson coefficient), suggesting that continued drying may limit future growth at this section of Arctic treeline. We conclude that while warmer temperatures appear to benefit annual growth in mature trees, the warmer and drier environmental conditions in spring and summer inhibit regeneration and therefore may be inhibiting the northward advance at this Arctic treeline site. Researchers should consider the interactions between temperature, water availability, and tree age when examining the future of treeline and boreal forest in a changing climate.

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Variation in White spruce needle respiration at the species range limits: A potential impediment to Northern expansion

Cited by 4 publications

References 96 publications

Vertical gradients in photosynthetic physiology diverge at the latitudinal range extremes of white spruce

Vertical gradients in photosynthetic physiology diverge at the latitudinal range extremes of white spruce

It's only natural: Plant respiration in unmanaged systems

Growth increases but regeneration declines in response to warming and drying at Arctic treeline in white spruce (Picea glauca)

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