Shared drought responses among conifer species in the middle Siberian taiga are uncoupled from their contrasting water-use efficiency trajectories

Voltas, Jordi; Aguilera, Mònica; Gutiérrez, Emília; Shestakova, Tatiana A.

doi:10.1016/j.scitotenv.2020.137590

Cited by 8 publications

(4 citation statements)

References 59 publications

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“…The nonlinear trends in i WUE found in our study are in line with the reported shifts from passive to active responses to rising atmospheric c a and small increases in i WUE observed in the last decades for some high‐latitude conifer forests (Saurer et al., 2004, 2014; Voltas et al., 2020). Since Δ 13 C slightly increased at both sites over the last century, the increase in i WUE after 1970 was most likely a response to rising c a than a response to temperature‐induced drought stress.…”

Section: Discussionsupporting

confidence: 91%

Nonlinear Growth and Physiological Responses of White Spruce at North American Arctic Treeline

et al. 2023

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The boreal forest biome covers a quarter of the Earth's terrestrial surface and plays a critical role in the global carbon and water cycles. Approximately one third of the globe's terrestrial carbon stock is stored in boreal forests (Bradshaw & Warkentin, 2015;Pan et al., 2011), where the growth of trees is responsible for most of the carbon sink activity in the Arctic (McGuire et al., 2009). These high-latitude forests are ecologically sensitive regions and can show amplified response to the strong warming observed in the Arctic (Chapin et al., 2005;Seddon et al., 2016). In the last few decades, global warming and related changes in surface hydrology and energy budgets (Chapin et al., 2010(Chapin et al., , 2005 have led to substantial changes in forest productivity and structure (Beck et al., 2011). These changes have been quite pronounced at the Arctic latitudinal treeline where unprecedented changes in vegetation composition and growth have occurred (Pearson et al., 2013).

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Section: Discussionsupporting

confidence: 91%

Nonlinear Growth and Physiological Responses of White Spruce at North American Arctic Treeline

et al. 2023

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“…For TRW, there is a positive response to winter-spring temperatures, which has been previously recorded in other areas within the southern and middle taiga zones [103][104][105][106] from Germany to Central Siberia. On the contrary, in the mountain taiga of Southern Siberia and Mongolia, despite the similar seasonal dynamics of temperature and precipitation, such a response does not occur in pine (for example [107,108]).…”

Section: Climatic Response Of Pine Radial Growth Parameters and Its D...supporting

confidence: 56%

The More the Merrier or the Fewer the Better Fare? Effects of Stand Density on Tree Growth and Climatic Response in a Scots Pine Plantation

Kholdaenko

Babushkina

Belokopytova

et al. 2023

Forests

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In forests, the growth and productivity of individual trees and stands as a whole are regulated by stand density among other factors, because access to vital resources is limited by competition between trees. On 18 experimental plots of Scots pine (Pinus sylvestris L.) planted with a density of 500–128,000 trees/ha in the south taiga (Middle Siberia), interactions between stand density, tree- and stand-scale productivity, and tree-ring parameters were investigated. Tree-scale productivity variables, tree-ring width, and latewood width had stable negative allometric relationships with stand density (R2 > 0.75), except for tree height (insignificant for inventory surveys at ages of 20 and 25 years; R2 > 0.4 at the age of 35 years), while positive allometry was registered for stand productivity variables (R2 > 0.7) and the all-time average latewood ratio (R2 = 0.5 with planting density). Tree-ring parameters aside from the age trends correlate (p < 0.05) between the plots and demonstrate common responses to moderate moisture deficit. Although, its seasonality apparently depends on the resource base and intensity changes with stand density. February–June precipitation is more important for pine growth in dense stands, July–August conditions affect the latewood ratio stronger in sparse stands, and medium-density stands are more resistant to winter frosts.

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“…A growing body of evidence shows that plants can close their stomata during drought events to avoid unnecessary water loss. Consequently, stomatal conductance to CO 2 decreases and Rubisco fixes a higher-than-usual proportion of 13 C compared to 12 C. As a result, rings are formed in which the cellulose is enriched in the heavier isotope, which translates as less negative isotopic signatures and those large anomalies in their δ 13 C can be indicators of forest health [106][107][108][109]. Other studies of co-occurring healthy and dead trees found a lower i WUE in dead trees, suggesting either a reduction in photosynthesis rates or, more probably, a poor regulation of stomatal conductance [110][111][112].…”

Section: Tree Response To Droughtmentioning

confidence: 99%

Tree Vitality and Forest Health: Can Tree-Ring Stable Isotopes Be Used as Indicators?

2021

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Purpose of Review Society is concerned about the long-term condition of the forests. Although a clear definition of forest health is still missing, to evaluate forest health, monitoring efforts in the past 40 years have concentrated on the assessment of tree vitality, trying to estimate tree photosynthesis rates and productivity. Used in monitoring forest decline in Central Europe since the 1980s, crown foliage transparency has been commonly believed to be the best indicator of tree condition in relation to air pollution, although annual variations appear more closely related to water stress. Although crown transparency is not a good indicator of tree photosynthesis rates, defoliation is still one of the most used indicators of tree vitality. Tree rings have been often used as indicators of past productivity. However, long-term tree growth trends are difficult to interpret because of sampling bias, and ring width patterns do not provide any information about tree physiological processes. Recent Findings In the past two decades, tree-ring stable isotopes have been used not only to reconstruct the impact of past climatic events, such as drought, but also in the study of forest decline induced by air pollution episodes, and other natural disturbances and environmental stress, such as pest outbreaks and wildfires. They have proven to be useful tools for understanding physiological processes and tree response to such stress factors. Summary Tree-ring stable isotopes integrate crown transpiration rates and photosynthesis rates and may enhance our understanding of tree vitality. They are promising indicators of tree vitality. We call for the use of tree-ring stable isotopes in future monitoring programmes.

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Shared drought responses among conifer species in the middle Siberian taiga are uncoupled from their contrasting water-use efficiency trajectories

Cited by 8 publications

References 59 publications

Nonlinear Growth and Physiological Responses of White Spruce at North American Arctic Treeline

Nonlinear Growth and Physiological Responses of White Spruce at North American Arctic Treeline

The More the Merrier or the Fewer the Better Fare? Effects of Stand Density on Tree Growth and Climatic Response in a Scots Pine Plantation

Tree Vitality and Forest Health: Can Tree-Ring Stable Isotopes Be Used as Indicators?

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