Fir (Abies sibirica Ledeb.) Mortality in Mountain Forests of the Eastern Sayan Ridge, Siberia

Харук, В. И.; Шушпанов, А. С.; Petrov, Il’ya A.; Demidko, Denis A.; Im, Sergei T.; Knorre, Anastasia A.

doi:10.1134/s199542551904005x

Cited by 19 publications

(10 citation statements)

References 22 publications

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“…Decreasing soil moisture levels were a main cause of massive dieback of spruce stands in Arkhangelsk oblast in 1990-2000 (Aakala and Kuuluvainen, 2011). Similar dieback processes occurred in fir stands in the Krasnoyarsk kray since 2010, caused by an extreme drought followed by invasion of Sakhalin-fir bark beetle, which was not earlier observed in the region (Kharuk et al, 2019).…”

Section: Observed Changes In Forest Disturbancesmentioning

confidence: 65%

Russian forests and climate change

Georgy

Pekka²,

Lindner³

et al. 2020

What Science Can Tell Us

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Section: Observed Changes In Forest Disturbancesmentioning

confidence: 65%

Russian forests and climate change

Georgy

Pekka²,

Lindner³

et al. 2020

What Science Can Tell Us

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“…Although insect outbreaks occurred also in former epoch (Alfaro et al 2010), warming and increased aridity are one of the causes of Dendroctonus spp and Dendrolimus pini catastrophic outbreaks in North American and German forests (Haynes et al 2014;Bentz et al 2010;Weed et al 2013). Similarly, in Russia, periodic droughts stimulated bark beetle (Polygraphus proximus Blandford) outbreaks that caused extensive (> 500,000 ha) fir mortality in Siberia (Kharuk et al 2019). The alpine and northern silkmoth outbreak ranges are limited by cold temperatures (Kondakov 2002).…”

Section: Introductionmentioning

confidence: 99%

Siberian silkmoth outbreaks surpassed geoclimatic barrier in Siberian Mountains

Харук

Soldatov³

2020

J. Mt. Sci.

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Siberian silkmoth (SSM, Dendrolimus sibiricus Tschetv.) is the most important defoliator of Siberian pine (Pinus sibirica Du Tour) and fir (Abies sibirica Ledeb.) stands. Warming-induced SSM outbreaks are one of the major driving factors of successions within the taiga zone. It is suggested that climate change impacted the SSM range and life cycle. We analyzed the migration of alpine and northerly SSM outbreak boundaries in Siberia and the impact of the climate variables and topography on the outbreak dynamics. We used time-series scenes (multispectral data, and vegetation indexes EVI and NDII) in combination with field studies, climate variables, and GIS techniques. We found that SSM outbreaks in the area of alpine boundary shifted about 370 m uphill since the mid of 1950. The outbreak onset was promoted by increased dryness and active temperatures and decreased root zone moisture content in the spring-early summer period. The terrain topography strongly affected SSM outbreak onset and dynamics. Initially, the outbreak was located at the middle elevations on the gentle concave southeastern slopes, which are the favorable insect habitats between outbreaks. Then the outbreak expanded uphill and downhill, to steeper slopes, and both concave and convex terrains. Alongside with elevation range expansion, SSM surpassed its northern historical outbreak boundary: the potential outbreaks' boundary moved about 300 km northward. Climate warming contributes to SSM migration into former outbreak free conifer stands located in highlands and at northern latitudes.

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“…In Siberia, “dark needle conifer” forests formed by Siberian pine ( Pinus sibirica Du Tour) and fir ( Abies sibirica Ledeb.) have experienced growth reduction and mortality in recent decades (Kharuk, Shushpanov, et al., 2019). The ranges of these species overlap and extend from the Mongolian border up to the Arctic Circle.…”

Section: Introductionmentioning

confidence: 99%

Climate‐driven conifer mortality in Siberia

Харук

Petrov

et al. 2020

Global Ecol. Biogeogr.

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AimAn increase in conifer mortality has been observed widely across the boreal forest biome. We investigate the causes of this mortality, in addition to the geospatial and temporal dynamics of mortality, in Siberian pine and fir stands.LocationCentral Siberia.Time period1950–2018.Major taxa studiedPinus sibirica Du Tour and Abies sibirica Ledeb.MethodsWe used geospatial analysis of satellite‐derived (MODIS, Landsat) data, topography (elevation, slope steepness and exposure) and climatic variables [precipitation, thermal degree days (TDD = ∑(t > 0 °C), standardized precipitation evapotranspiration index (SPEI) and root zone moisture content (RZM)], together with in situ data. Dendrochronology was applied for analysis of the radial growth increment (GI).ResultsSiberian pine and fir mortality has increased greatly in recent decades. The mortality of forest stands and trees was dependent on the TDD, RZM and SPEI. Mortality occurred mainly within the southern part of the species ranges and decreased northward, correlated with latitudinal gradients of TDD and SPEI. Mortality was observed mostly at elevations < 1,000 m and decreased with increasing elevation, whereas the area of forests and GI of trees increased with elevation. Forest mortality was preceded by the changes in tree GI. Since the onset of climate warming, GI increased until a breakpoint in the mid‐1980s. Further temperature increase caused a reduction in GI owing to moisture stress and division of the tree population into “decliners” and “survivors”. Mortality was caused by the combined impact of moisture stress and bark beetle attacks.Main conclusionSiberian pine and fir mortality was preceded by a reduction in the GI of trees caused by elevated air temperatures, acute droughts and subsequent insect attacks. Forest mortality was observed mostly at low elevations, whereas within the areas with sufficient moisture availability (at elevations c. < 1,000 m) the tree GI and forest area increased. With the projected increase in drought, Siberian pine and fir trees are predicted to retreat from their southern low‐elevation ranges.

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Fir (Abies sibirica Ledeb.) Mortality in Mountain Forests of the Eastern Sayan Ridge, Siberia

Cited by 19 publications

References 22 publications

Russian forests and climate change

Russian forests and climate change

Siberian silkmoth outbreaks surpassed geoclimatic barrier in Siberian Mountains

Climate‐driven conifer mortality in Siberia

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