Anastasia A Knorre

• D.Sc. (Ecology) Director in Science National Park "Krasnoyarsk Stolby"
• Professor at Siberian Federal University

Fungi are among the most diverse and ecologically important kingdoms in life. However, the distributional ranges of fungi remain largely unknown as do the ecological mechanisms that shape their distributions1,2. To provide an integrated view of the spatial and seasonal dynamics of fungi, we implemented a globally distributed standardized aerial sam...

Novel methods for sampling and characterizing biodiversity hold great promise for re-evaluating patterns of life across the planet. The sampling of airborne spores with a cyclone sampler, and the sequencing of their DNA, have been suggested as an efficient and well-calibrated tool for surveying fungal diversity across various environments. Here we...

Abstract Perennially frozen soil, also known as permafrost, is important for the functioning and productivity of most of the boreal forest, the world’s largest terrestrial biome. A better understanding of complex vegetation-permafrost interrelationships is needed to predict changes in local- to large-scale carbon, nutrient, and water cycle dynamics...

Boreal regions are changing rapidly with anthropogenic global warming. In order to assess risks and impacts of this process, it is crucial to put these observed changes into a long-term perspective. Summer air temperature variability can be well reconstructed from conifer tree rings. While the application of stable isotopes can potentially provide...

Climate warming is expected to lengthen the growing season of tree species and enhance radial growth rates. Alternatively, a longer growing season could not lead to improved radial growth if wood production depends more on growth rate than on growing season length. We test these ideas by comparing leaf phenology data and the estimated start and end...

Wildfires are one of the most important environmental factors controlling forest ecosystem physiology and the carbon balance in the permafrost zone of North Siberia. We investigated tree-ring width (TRW) and stable isotope chronologies in tree-ring cellulose (δ13CCell, δ18OCell) of Larix Gmelinii (Rupr.) Rupr. from a wet (WS) and a dry (DS) site. T...

Global climate change impacts the functioning and productivity of forest ecosystems at various spatiotemporal scales across a wide range of biomes. Although summer temperatures are considered the main driver of boreal tree growth, the importance of soil moisture availability is likely to rise with decreasing latitude and increasing warming. Here, w...

A significant part of carbon assimilated by forest is deposited in tree trunks. Growth and development of tree stands is accompanied by accumulation of standing dead trees (snags) due to natural tree mortality and as a result of the impact of exogenous factors. Carbon accumulated in these dead trunks is excluded from the fast turnover due to low ra...

Recent climatic changes significantly affected forest ecosystems in northern Eurasia. Trees growing in Siberia are very sensitive to climate change due to strong temperature limitation of their growth. Our study covers high-latitude (northeastern Yakutia, eastern Taimyr, central Evenkia) and high-altitude (Russian Altai) zones in Eurasia, where tre...

Ongoing climate change can shift organism phenology in ways that vary depending on species, habitats and climate factors studied. To probe for large-scale patterns in associated phenological change, we use 70,709 observations from six decades of systematic monitoring across the former Union of Soviet Socialist Republics. Among 110 phenological even...

This work is targeted to evaluate the reaction of individual trees against periodic and punctual environmental stressing events with a network of long-term monitoring of tree water/growth-related processes in various geographic and climatic areas. Instrumental measurements of stem circumferential/radial size changes (dRc/dR) using band/point dendro...

For species to stay temporally tuned to their environment, they use cues such as the accumulation of degree-days. The relationships between the timing of a phenological event in a population and its environmental cue can be described by a population-level reaction norm. Variation in reaction norms along environmental gradients may either intensify...

Significance To do the right thing at the right time, organisms need to glean cues from their environment. How they respond can then be described by reaction norms, i.e., by the relationship between the phenotype expressed (the phenology of an event) and the environment (the date when a given number of degree-days are achieved). We use information...

The document is a supplementary material to the paper in the Ecolgy Letters: Kirdyanov A.V., Krusic P.J., Shishov V.V., Vaganov E.A., Fertikov A.I., Myglan V.S., Barinov V.V., Browse J., Esper J., Ilyin V.A., Knorre A.A., Korets M.A., Kukarskikh V.V., Mashukov D.A., Onuchin A.A., Piermattei A., Pimenov A.V., Prokushkin A.S., Ryzhkova V.A., Shishik...

Although the effect of pollution on forest health and decline received much attention in the 1980s, it has not been considered to explain the 'Divergence Problem' in dendroclimatology; a decou-pling of tree growth from rising air temperatures since the 1970s. Here we use physical and bio-geochemical measurements of hundreds of living and dead conif...

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

Wildfires are an important factor in controlling forest ecosystem dynamics across the circumpolar boreal zone. An improved understanding of their direct and indirect, short- to long-term impacts on vegetation cover and permafrost–vegetation coupling is particularly important to predict changes in carbon, nutrient and water cycles under projected cl...

We present an extensive, large-scale, long-term and multitaxon database on phenological and climatic variation, involving 506,186 observation dates acquired in 471 localities in Russian Federation, Ukraine, Uzbekistan, Belarus and Kyrgyzstan. The data cover the period 1890–2018, with 96% of the data being from 1960 onwards. The database is rich in...

The radial increment of Abies sibirica Ledeb. and mortality dynamics of fir stands in the mountain forests of the Eastern Sayan (Stolby State Nature Reserve) have been analyzed. The unprecedented decline in fir stands is caused by water stress due to an increase in air temperature and synergy with the impact of the Polygraphus proximus Blandford. T...

A comparative analysis of the seasonal formation of tree rings has been performed in Siberian larch (Larix sibirica Ledeb.) and Scots pine (Pinus sylvestris L.), growing in the southern taiga of Central Siberia in two sites on the altitudinal transect (200 and 536 m a.s.l.). Core samples were taken from April to September in 2012. The results have...

Background: For brown bears (Ursus arctos), hibernation is a critical part of the annual life cycle because energy savings during hibernation can be crucial for overwintering, and females give birth to cubs at that time. For hibernation to be a useful strategy, timing is critical. However, environmental conditions vary greatly, which might have a...

Although it has been recognized that rising temperatures and shifts in the hydrological cycle affect the depth of the seasonally thawing upper permafrost stratum, it remains unclear to what extent the frequency and intensity of wildfires, and subsequent changes in vegetation cover, influence the soil active layer on different spatiotemporal scales....

The issues of carbon deposition in the biomass of plants and soils of complex forest phytocenoses of the Stolby reserve are discussed. The materials were received in 2013-2016. with the support of the Ministry of Education and Science of the Russian Federation and the Russian Foundation for Basic Research. It is intended for scientific workers in t...

Key message Minimum wood density exhibits strong responses to precipitation and, thus, it is a robust proxy of early season water availability. Abstract Tracheids fulfil most wood functions in conifers (mechanical support and water transport) and earlywood tracheids account for most hydraulic conductivity within the annual tree ring. Dry condition...

Climate warming increases vulnerability to drought in Mediterranean water‐limited forests. However, we still lack knowledge of the long‐term physiological responses of coexisting pine species in these forests regarding their ability to cope with warming‐induced drought stress. We investigated spatiotemporal patterns of tree performance for five iso...

The biogeochemistry and ecology of the Arctic environment have been heavily impacted by anthropogenic pollution and climate change. We used ICP-MS to measure concentrations of 26 elements in the AD 1300-2000 tree rings of larch from the Taymyr Peninsula in northern Siberia for studying the interaction between environmental change and wood chemistry...

Significance Forests dominate carbon fluxes in terrestrial ecosystems. We demonstrate how an intensified climatic influence on tree growth during the last 120 y has increased spatial synchrony in annual ring-width patterns within contrasting (boreal and Mediterranean) Eurasian biomes and on broad spatial scales. Current trends in tree growth synchr...

Trends in elemental concentrations of tree rings from the Siberian Arctic. Tree‐Ring Research 72:67─77. Fig. S1. Schematic diagram describing methodological approach used in this study to detect the changes in variance behavior of normalized element concentrations measured in tree rings. A) Sampled trees and their overlaps: line represents a span o...

In the context of global carbon cycle management, accurate knowledge of carbon content in forests is a relevant issue in contemporary forest ecology. We measured the above-ground and soil carbon pools in the dark-coniferous boreal taiga. We compared measured carbon pools to those calculated from the forest inventory records containing volume stock...

Individual correlations between radial increments of trees and meteorological environmental factors were investigated in 28-year-old clone cultures of Scotch pine (Pinus sylvestris L.) growing at an experimental site of Forestry Institute, Siberian Branch, Russian Academy of Sciences, in the Sredneobskiy pine forest. Significant genotypic differenc...

Recent findings indicated spruce from North America and larch from eastern Siberia to be the dominating tree species of Arctic driftwood throughout the Holocene. However, changes in source region forest and river characteristics, as well as ocean current dynamics and sea ice extent likely influence its spatiotemporal composition. Here, we present 2...

Understanding how climate change affects forests at varying spatiotemporal scales is important for anticipating its impacts on terrestrial ecosystems. Tree populations located near distribution boundaries or in regions where growth is constrained by a dominant climatic factor may provide valuable information on tree-growth responses to climate chan...

The radial growth of Siberian larch under the impact of pollutants emitted by enterprises of Norilsk has been analyzed to reconstruct the die-off dynamics of larch stands located along the Rybnaya River, along the main direction of pollutant air transport. Dendrochronological cross dating is used to detect the year of die off of 268 trees growing i...

In this paper we present for the first time the changes in biologically�important elements (P, K, Ca, Mg, Sr, Ba, Cl, Si) from 1300 to 2000 AD in the annual rings of larch (Larix gmelinii Rupr.) from the Taimyr Peninsula (polar boundary of forest vegetation, 72° N). In this study we only consider selected elements that are considered most informati...

The main goal of this study is to improve our understanding of the influence of a changing climate on trees in extreme conditions by a detailed analysis of the factors controlling tree-ring growth. We investigated forest ecosystems in regions that are very sensitive to climatic changes and where rapid and dramatic environmental and climatic changes...

Forest fire is one of the most important environmental factors which define forest ecosystem functioning in the continuous permafrost zone in the north of Siberia. Tree-ring width (TRW) and stable isotope (13C/12C and 18O/16O) chronologies from two Larix Gmelinii sites with initially different conditions (wet and dry) and characterized by different...

We developed a long (600-year) dataset for the concentrations of 26 elements in tree rings of larch from the Taymir Peninsula, the northernmost region in the world (ca. 72°N) where trees grow. Tree rings corresponding to the time period from 1300 to 1900 A.D. were studied. Eleven wood strips, each from a different larch tree, were cut into ca. 100...

The microbial activity of peat soils was studied in boggy larch forests and in an oligo-mesotrophic bog in the basins of the Kochechum and Nizhnaya Tunguska rivers (central Evenkia). It was found that the organic matter transformation in the peat soils of all the plots is mainly performed by oligotrophic bacteria composing 88–98% of the total bacte...

Variation in radial increments of 28-year-old Pinus sylvestris L. clones in response to changes in weather conditions during the period between 1986 and 2007 has been studied in the Sredneobskii Bor pine forest. Significant genotypic differences in the adaptive reaction norm of the clones have been revealed. It has been shown that the contribution...

Ongoing climatic changes potentially affect tree-line ecosystems, but in many regions the observed changes are superimposed by human activities. We assessed how the forest-tundra ecotone has changed during the last century in the Putorana Mountains, northern Siberia, an extremely remote and untouched area in Eurasia. A space-for-time approach was u...

We report the research results derived from identifying the regional climatic signal contained in the coniferous tree ring-width variability for different topoecological conditions in the forest-steppe of the Republic of Khakassia. It is found that under different growth conditions for trees of the same species the climatic signal undergoes a signi...

The ongoing industrialization in the last 150 years left its fingerprints with an increase in atmospheric CO2 (ca) from ca. 260 to 385 ppm due to the growing use of fossil fuels. Elevated CO2 affects the vegetation, as plants respond instantaneously with an increased photosynthetic rate, and a reduction in stomatal conductance. This results in a lo...

Paleoclimate reconstructions from tree-ring widths and maximum wood density are most successful in localities with extreme climates for particular tree species that are most responsive. Climate proxy records from other, less conventional, tree-ring parameters have been rapidly increasing over the last decade. We assembled a unique dataset of carbon...

Tree ring width, density, and ratio of stable isotopes (13C/12C and 18O/16O) in wood and cellulose were determined for larch (Larix sibirica Ledeb.) growing under water deficit conditions in the forest steppe zone in central Siberia (54°24′N, 89°57′E) for the period 1850–2005. Dendroclimatic analysis of the chronologies indicated precipitation to b...

The results of dendroclimatic study were carrying out on the timber-line of mountain-taiga vegetation belt (1500-1600 m a.s.l.) in the Ergaki Natural Park. Six tree-ring chronologies for Siberian stone pine and Siberian fir were established. They covered the time period from 100 to 400 years. The comparison analysis between tree radial growth and t...

As a complementary field of dendroecology and dendroclimatology, stable isotope analysis in tree rings has a large potential. However, in Siberia tree-ring isotope studies were initiated quite recently and only a few data are available for this vast territory. To understand advantages of using the isotope data in Siberia, we analyzed tree-ring widt...

Forest fire is among the main environmental factors which determine structure and functioning of boreal ecosystems. In permafrost zone of Siberia (Russia), seasonal thawing depth after fires increases considerably. Then, tree regeneration and ground vegetation recovery lead to increasing thermal insulation of soil surface and, consequently rise of...

The increasing industrialization in the last 150 years brought an increasing atmospheric CO2 concentration (ca) from ca. 260 to 385 ppm as a result of the growing use of fossil fuels. Besides the greenhouse effect elevated CO2 leaves also its fingerprints on the vegetation, as plants respond instantaneously with an increased photosynthetic rate, an...

Tree-ring width of Larix gmelinii (Rupr.) Rupr., ratios of stable isotopes of C (delta(13)C) and O (delta(18)O) of whole wood and cellulose chronologies were obtained for the northern part of central Siberia (Tura, Russia) for the period 1864-2006. A strong decrease in the isotope ratios of O and C (after atmospheric delta(13)C corrections) and tre...

Tree ring width, density and ratio of stable isotopes (13C/12C and 18O/16O) in wood and cellulose were determined for larch (Larix sibirica Ledeb.) growing under water deficit conditions in the forest-steppe zone in Central Siberia. Dendroclimatic analysis of the chronologies indicated precipitation to be the most important factor determining tree-...

Productivity of the moss cover and necromass accumulation in the litter of a sphagnum larch forest have been estimated on the basis of tree age. It has been shown that the total carbon stock in the litter of a 100-year-old stand, including organic matter not destroyed by fire, exceeds the corresponding value for the tree stand itself by more than a...

To investigate the variability of primary production of boreal forest ecosystems under the current climatic changes, we compared the dynamics of annual increments and productivity of the main components of plant community (trees, shrubs, mosses) at three sites in the north of Siberia (Russia). Annual radial growth of trees and shrubs was mostly def...

Bog ecosystems occupy a significant part of Russia and play an important role in the turnover of major biogenic elements [1, 4]. According to latest estimates, the rate of long-term deposition of carbon from the atmosphere provided by bogs is comparable to the rate of carbon deposition provided by basic types of ecosystems [4, 8]. The annual rate o...