Hydraulic architecture and vulnerability to drought-induced embolism in southern boreal tree species of Inner Asia

Dulamsuren, Choimaa; Abilova, Sholpan B; Bektayeva, Madina; Eldarov, Mahammad; Schuldt, Bernhard; Leuschner, Christoph; Hauck, Markus

doi:10.1093/treephys/tpy116

Cited by 20 publications

(13 citation statements)

References 84 publications

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“…A critical role of the NSC reserves agrees with the observation that negative growth extremes in treering chronologies from these boreal forests are often responses to previous, but not current year's droughts (De Grandpré et al, 2011;Dulamsuren et al, 2013;Khansaritoreh et al, 2017). Furthermore, this assumption matches with a fairly embolism-resistant xylem architecture of L. sibirica (Dulamsuren, Abilova, et al, 2019), which efficiently acclimates to inter-annual and site-dependent variations in moisture availability (Chenlemuge et al, 2015).…”

Section: Possible Mechanisms For the Impact Of N Supply On Radial Stem Incrementsupporting

confidence: 81%

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Drought stress mitigation by nitrogen in boreal forests inferred from stable isotopes

Dulamsuren

Hauck

2021

Global Change Biology

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The productivity of plants in cold-limited ecosystems principally benefits from global warming causing the 'Arctic greening' in the tundra biome (Goetz et al., 2005) and the advancement of many alpine and polar treelines (Esper & Schweingruber, 2004;Harsch et al., 2009;MacDonald et al., 2008). Increased temperatures and improved nitrogen (N) availability as the result of accelerated organic matter decay resulting from a warmer climate trigger this response.The same combination of site factors limiting the productivity in

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Section: Possible Mechanisms For the Impact Of N Supply On Radial Stem Incrementsupporting

confidence: 81%

“…Furthermore, this assumption matches with a fairly embolism‐resistant xylem architecture of L . sibirica (Dulamsuren, Abilova, et al, 2019), which efficiently acclimates to inter‐annual and site‐dependent variations in moisture availability (Chenlemuge et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Drought stress mitigation by nitrogen in boreal forests inferred from stable isotopes

Dulamsuren

Hauck

2021

Global Change Biology

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“…Under whole ecosystem warming at SPRUCE there was greater hydraulic conductivity through the xylem for L. laricina as compared with P. mariana ; L. laricina root hydraulic conductivity was ~40% greater and root Ψ 50 was higher (indicating greater vulnerability to embolism). Results were similar to other native Larix and Picea species at the southern edge of the taiga, where branch vulnerability to embolism and hydraulically weighted xylem cell diameter were greater for Larix (Dulamsuren et al, 2019). At SPRUCE, lower K root in P. mariana may indicate a hydraulic bottleneck in supplying foliage with water.…”

Section: Discussionsupporting

confidence: 82%

Divergent species‐specific impacts of whole ecosystem warming and elevated CO₂on vegetation water relations in an ombrotrophic peatland

Warren

Jensen

Ward

et al. 2021

Global Change Biology

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Boreal peatland forests have relatively low species diversity and thus impacts of climate change on one or more dominant species could shift ecosystem function. Despite abundant soil water availability, shallowly rooted vascular plants within peatlands may not be able to meet foliar demand for water under drought or heat events that increase vapor pressure deficits while reducing near surface water availability, although concurrent increases in atmospheric CO2 could buffer resultant hydraulic stress. We assessed plant water relations of co‐occurring shrub (primarily Rhododendron groenlandicum and Chamaedaphne calyculata) and tree (Picea mariana and Larix laricina) species prior to, and in response to whole ecosystem warming (0 to +9°C) and elevated CO2 using 12.8‐m diameter open‐top enclosures installed within an ombrotrophic bog. Water relations (water potential [Ψ], turgor loss point, foliar and root hydraulic conductivity) were assessed prior to treatment initiation, then Ψ and peak sap flow (trees only) assessed after 1 or 2 years of treatments. Under the higher temperature treatments, L. laricina Ψ exceeded its turgor loss point, increased its peak sap flow, and was not able to recover Ψ overnight. In contrast, P. mariana operated below its turgor loss point and maintained constant Ψ and sap flow across warming treatments. Similarly, C. calyculata Ψ stress increased with temperature while R. groenlandicum Ψ remained at pretreatment levels. The more anisohydric behavior of L. laricina and C. calyculata may provide greater net C uptake with warming, while the more conservative P. mariana and R. groenlandicum maintained greater hydraulic safety. These latter species also responded to elevated CO2 by reduced Ψ stress, which may also help limit hydraulic failure during periods of extreme drought or heat in the future. Along with Sphagnum moss, the species‐specific responses of peatland vascular communities to drier or hotter conditions will shape boreal peatland composition and function in the future.

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“…This, in turn, prevents carbon dioxide uptake and causes a decrease in the photosynthesis capacity, thus limiting the carbon assimilation in older trees. These factors reduce the competitiveness of older trees under drought conditions and ultimately trigger carbon starvation and growth decline or even tree mortality (Dulamsuren et al, 2019; McDowell et al, 2008; Sevanto et al, 2014). Many studies have suggested that photosynthesis and stomatal conductance of old trees are lower than those of younger individuals (Grulke and Miller, 1994; Kull and Koppel, 1987; Schoettle, 1994), consistent with the above arguments.…”

Section: Discussionmentioning

confidence: 99%

The Vulnerability of Qilian Juniper to Extreme Drought Events

2019

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Identifying which trees are more vulnerable to extreme climatic events is a challenging problem in our understanding of forest and even ecosystem dynamics under climate change scenarios. As one of the most widely distributed tree species across the arid and semi-arid northeastern Tibetan Plateau, Qilian juniper (Juniperus przewalskii Kom.), is the main component of the local forest ecosystem, providing critical insurance for the ecological security of the surrounding areas. However, this species’s ability to cope with climate extremes (especially drought) has not been adequately assessed. Here, we apply a dendroecological approach that considers indices of resistance and resilience to quantify the vulnerability of Qilian junipers to the extreme drought events of 1957, 1966, 1979, and 1995. A total of 532 Qilian juniper trees from different age stages (100–1,100 years) and altitudes [3,500–4,000 m above sea level (a.s.l.)] were studied to assess their response characteristics during these four drought extremes. We conclude that drought extremes have a significant negative impact on the growth of Qilian juniper. The oldest Qilian junipers at the lower altitudes constituted the most vulnerable populations across the northeastern Tibetan Plateau and were characterized by the lowest resistance values, the narrowest annual rings, and the highest proportion of missing rings during the four drought years. Tree resilience after droughts was strongly related to the intensity of the drought event and did not change with tree age or elevation. A threshold of tree tolerance to drought may exist, with the more vulnerable tree individuals (e.g., the oldest Qilian junipers from lower altitudes) being exposed to the highest mortality risk when drought intensity exceeds the threshold value. Such a threshold needs further consideration, through the study of trees that have died (or are about to die) due to extreme droughts.

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Hydraulic architecture and vulnerability to drought-induced embolism in southern boreal tree species of Inner Asia

Cited by 20 publications

References 84 publications

Drought stress mitigation by nitrogen in boreal forests inferred from stable isotopes

Drought stress mitigation by nitrogen in boreal forests inferred from stable isotopes

Divergent species‐specific impacts of whole ecosystem warming and elevated CO₂on vegetation water relations in an ombrotrophic peatland

The Vulnerability of Qilian Juniper to Extreme Drought Events

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Hydraulic architecture and vulnerability to drought-induced embolism in southern boreal tree species of Inner Asia

Cited by 20 publications

References 84 publications

Drought stress mitigation by nitrogen in boreal forests inferred from stable isotopes

Drought stress mitigation by nitrogen in boreal forests inferred from stable isotopes

Divergent species‐specific impacts of whole ecosystem warming and elevated CO2on vegetation water relations in an ombrotrophic peatland

The Vulnerability of Qilian Juniper to Extreme Drought Events

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Divergent species‐specific impacts of whole ecosystem warming and elevated CO₂on vegetation water relations in an ombrotrophic peatland