Morphological variability and quality of seeds of Larix gmelinii (Rupr.) Rupr.

Barchenkov, A. P.

doi:10.1134/s1995425511030131

Cited by 9 publications

(6 citation statements)

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“…(), who find that the germination rate of seeds from the treeline ecotone is <1%, compared with 80% from more southerly forests. A study by Barchenkov () finds that decreasing seed mass and germination capacity of L. gmelinii is correlated with elevation and the production of viable seeds is highly correlated with summer air temperature (Kullman ). Our model results likewise suggest that seed availability is a severe bottleneck for larch establishment in single‐tree tundra sites.…”

Section: Discussionmentioning

confidence: 99%

Dissimilar responses of larch stands in northern Siberia to increasing temperatures—a field and simulation based study

Wieczorek

Kruse

Epp

et al. 2017

Ecology

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Arctic and alpine treelines worldwide differ in their reactions to climate change. A northward advance of or densification within the treeline ecotone will likely influence climate-vegetation feedback mechanisms. In our study, which was conducted in the Taimyr Depression in the North Siberian Lowlands, w present a combined field- and model-based approach helping us to better understand the population processes involved in the responses of the whole treeline ecotone, spanning from closed forest to single-tree tundra, to climate warming. Using information on stand structure, tree age, and seed quality and quantity from seven sites, we investigate effects of intra-specific competition and seed availability on the specific impact of recent climate warming on larch stands. Field data show that tree density is highest in the forest-tundra, and average tree size decreases from closed forest to single-tree tundra. Age-structure analyses indicate that the trees in the closed forest and forest-tundra have been present for at least ~240 yr. At all sites except the most southerly ones, past establishment is positively correlated with regional temperature increase. In the single-tree tundra, however, a change in growth form from krummholz to erect trees, beginning ~130 yr ago, rather than establishment date has been recorded. Seed mass decreases from south to north, while seed quantity increases. Simulations with LAVESI (Larix Vegetation Simulator) further suggest that relative density changes strongly in response to a warming signal in the forest-tundra while intra-specific competition limits densification in the closed forest and seed limitation hinders densification in the single-tree tundra. We find striking differences in strength and timing of responses to recent climate warming. While forest-tundra stands recently densified, recruitment is almost non-existent at the southern and northern end of the ecotone due to autecological processes. Palaeo-treelines may therefore be inappropriate to infer past temperature changes at a fine scale. Moreover, a lagged treeline response to past warming will, via feedback mechanisms, influence climate change in the future.

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Section: Discussionmentioning

confidence: 99%

Dissimilar responses of larch stands in northern Siberia to increasing temperatures—a field and simulation based study

Wieczorek

Kruse

Epp

et al. 2017

Ecology

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“…Seed viability is another factor that could influence propagule availability in the postfire landscape (Batkhuu et al, 2010; Moles & Westoby, 2004). In Larix gmelinii , a closely related larch species, seeds with an underdeveloped embryo (<40 of the embryonic channels filled) had much lower germination and were more commonly found in northern populations (Barchenkov, 2011). L. cajanderi has relatively low germination rates (12%–16%; Alexander et al, 2018) and future studies are needed to assess the influence of stand density on seed viability.…”

Section: Discussionmentioning

confidence: 99%

“…The horizontal dotted line represents a safety power of 1, which indicates no difference in safe site establishment success. (Barchenkov, 2011). L. cajanderi has relatively low germination rates (12%-16%; Alexander et al, 2018) and future studies are needed to assess the influence of stand density on seed viability.…”

Section: Discussionmentioning

confidence: 99%

Seed sources and safe sites as drivers of Larix cajanderi regeneration following wildfire in the Siberian Arctic

et al. 2023

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Larix cajanderi forests, which occupy vast regions of Siberia, grow atop and protect carbon‐rich permafrost. Regeneration of these forests has important implications for long‐term feedbacks into the climate system and their regeneration is strongest following stand‐replacing fires. The goal of this project was to assess sources of regeneration limitation in L. cajanderi forests in northeastern Siberia. We focused on (1) regeneration potential of stands varying in tree density and (2) analyzing seedling establishment patterns in relationship to microsite conditions (safe sites) in the landscape. Seed sources were assessed through cone counts and stand surveys in the summers of 2017 and 2018 in 17 mature L. cajanderi stands. L. cajanderi recruitment patterns in relationship to safe site availability were assessed in 15 areas, spanning approximately 800 km2 along the northern portion of the Kolyma River (69.5477° N, 161.3641° E). Density of trees in a stand was negatively related to the number of cones that the average tree produced and stands of moderate density produced more cones per area than either high‐ or low‐density stands. L. cajanderi seedling establishment was facilitated by safe sites in the landscape. We discovered strong evidence that safe sites are considerably more important for seedling establishment in lowland sites than upland areas. The biological explanation for this pattern is presently unknown; however, we hypothesize this pattern is driven by persistently wet (marshy) soils in some lowland sites as a limiter of seedling establishment. Overall, these data suggest the potential for complex linkages between forest density, propagule availability, fire, safe sight colonization, and seedling establishment that may regulate long‐term dynamics in the understudied L. cajanderi forests of the Siberian Arctic.

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“…L. gmelinii forests with L. gmelinii as the main species often form a large area of simple forest. This species comprises China’s largest cold temperate forest, an ecosystem susceptible to global warming ( Barchenkov, 2011 ).…”

Section: Introductionmentioning

confidence: 99%

Priority conservation area of Larix gmelinii under climate change: application of an ensemble modeling

et al. 2023

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Larix gmelinii (Rupr.) Kuzen is a major tree species with high economic and ecological value in the Greater Khingan Mountains coniferous forest of Northeast China. Reconstructing the priority Conservation Area of Larix gmelinii under Climate could provide a scientific basis for its germplasm conservation and management. The present study used ensemble and Marxan model simulations to predict species distribution areas and delineate priority conservation areas for Larix gmelinii in relation to productivity characteristics, understory plant diversity characteristics, and climate change impacts. The study revealed that the Greater Khingan Mountains and the Xiaoxing'an Mountains, with an area of approximately 300 974.2 km2, were the most suitable for L. gmelinii. The stand productivity of L. gmelinii in the most suitable area was significantly higher than that in the less suitable and marginally suitable areas, but understory plant diversity was not dominant. The increase in temperature under future climate change scenarios will reduce the potential distribution and area under L. gmelinii; the species will migrate to higher latitudes of the Greater Khingan Mountains, while the degree of niche migration will gradually increase. Under the 2090s-SSP585 climate scenario, the most suitable area for L. gmelinii will completely disappear, and the climate model niche will be completely separated. Therefore, the protected area of L. gmelinii was demarcated with a target of the productivity characteristics, understory plant diversity characteristics and climate change sensitive area, and the current key protected area was 8.38 × 104 km2. Overall, the study’s findings will lay a foundation for the protection and rational development and utilization of cold temperate coniferous forests dominated by L. gmelinii in the northern forested region of the Greater Khingan Mountains.

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Morphological variability and quality of seeds of Larix gmelinii (Rupr.) Rupr.

Cited by 9 publications

References 0 publications

Dissimilar responses of larch stands in northern Siberia to increasing temperatures—a field and simulation based study

Dissimilar responses of larch stands in northern Siberia to increasing temperatures—a field and simulation based study

Seed sources and safe sites as drivers of Larix cajanderi regeneration following wildfire in the Siberian Arctic

Priority conservation area of Larix gmelinii under climate change: application of an ensemble modeling

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