Tree mortality in a mixed deciduous forest in Northwestern Russia over 22 years

Drobyshev, Igor; Dobrovolsky, Alexander; Нешатаев, В.Ю.

doi:10.1051/forest/2009018

Cited by 6 publications

(7 citation statements)

References 36 publications

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“…Drobyshev et al (2008) suggests that for oak, density-regulated allogenic mortality may be of higher importance than exogenous mortality, especially in the beginning of its lifespan. Drobyshev et al (2009) found a significant and consistent association between tree condition and the probability of mortality, and significantly higher mortality rates in smaller trees of oak. The same variables as those finally included in the mortality model for Quercus pyrenaica have also been identified for others species: inverse of diameter at breast height (Bravo-Oviedo et al, 2006;Jutras et al, 2003;Karlsson and Norell, 2005); and individual height-dominant height ratio (Avila and Burkhart, 1992).…”

Section: Discussionmentioning

confidence: 61%

Modeling individual-tree mortality in Pyrenean oak (Quercus pyrenaica Willd.) stands

Adame¹,

Rı́o²,

Cañellas³

2010

Ann. For. Sci.

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Keywords:individual-tree mortality model / logistic regression / mixed model / rebollo oak / Mediteranean oak Abstract • Tree mortality is an important process in forest ecosystem dynamics and is one of the least understood phenomena, because of the complex interactions between different environmental stresses, minimal understanding of whole-plant mortality processes, and a chronic shortage of data.• A multilevel logistic regression model was developed for predicting the probability of mortality in individual trees with the objective of improving long-term planning in Spanish pyrenean oak forests. The data came from one 10-year re-measurement of the permanent plot network belonging to the Spanish National Forest Inventory distributed throughout north-west Spain.• The probability of mortality decreased with increasing individual diameter at breast height and increasing ratio of the height of subject tree to the dominant height of the sample plot. The resulting mortality model was evaluated using an independent data set from a region close to the study area.• The regeneration of pyrenean oak generally takes place through stump and/or root sprouting; so stand dynamics differ from those of others species. The model developed is expected to improve the accuracy of stand forecasts in northwest Spain.

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Section: Discussionmentioning

confidence: 61%

Modeling individual-tree mortality in Pyrenean oak (Quercus pyrenaica Willd.) stands

Adame¹,

Rı́o²,

Cañellas³

2010

Ann. For. Sci.

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“…In recent decades, inventories and dendroecological studies, combined with accurate historical climatic records, were significant sources of data for calibrating models of tree mortality (Bigler et al. 2007; Wunder 2007; Drobyshev, Dobrovolsky & Neshataev 2009). However, most studies were performed in ecotones, where signs of climate impact on forest ecosystems may be expected (Allen & Breshears 1998) and comparative assessments of climatic effects across dominant tree species or biome distributions are lacking.…”

Section: Introductionmentioning

confidence: 99%

Differential effects of climate variability on forest dynamics along a precipitation gradient in northern Patagonia

Suarez

Kitzberger

2010

Journal of Ecology

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Summary1. The understanding of the impacts of climate anomalies on demographic processes involved in forest dynamics is becoming a major global change research objective, as climate-driven demographic changes have the potential to alter ecological processes and change the composition of existing communities. 2. Here, we test whether the effects of climatic variability on Nothofagus dombeyi forest dynamics differ along the W-E precipitation gradient of northern Patagonia, Argentina, due to different controlling factors along the gradient. 3. Using a dendroecological approach, we sampled six N. dombeyi stands along the gradient. Tree death, growth release and sapling birth dates were obtained and used to reconstruct stand mortality, canopy disturbance and establishment patterns in each stand. Discrete extreme climatic events were obtained by applying thresholds to meteorological time series. Bivariate event analysis was performed to examine the temporal relationships between climate events and forest demographic and canopy disturbance patterns. 4. In the xeric region, forest dynamics is driven by drought/heat and humid events. Following drought/heat events we observed standing-dead tree mortality, releases in growth, and tree establishment episodes. Regional synchrony of these events was coincident with droughts registered for northern Patagonia. However, successful establishment was related to wet periods that occurred after drought events, showing the dependence on favourable periods for growth. For wet regions, demographic patterns showed a temporally uniform pattern but with synchronies at the regional and local scales. Canopy openings produced by fallen trees, and consequent release in growth and establishment, were related to both drought and snowy/windy years. The effect of drought in wet region forests was related mainly to the extreme 1998-99 drought in northern Patagonia. 5. Synthesis. Climate in northern Patagonia influences N. dombeyi forest dynamics differentially along a precipitation gradient. In xeric forests, strong but relatively short climatic fluctuations impact forest structure through direct effects on tree demography. In wet forests, climatic-induced mechanical disturbance prevails, driving mortality and subsequent growth and establishment. Considering that recent extreme droughts have the strongest negative impact on N. dombeyi populations at the eastern distributional limits, a change in distribution of this species as a consequence of projected climate change is expected.

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“…It is very interesting to determine the origin and period of existence of the lime-tree forest in the Lisino forest district. Analysis of mortality rates of the lime trees in the North-West (Eaton, Caudullo & de Rigo, 2016), as well as results of subsequent models of dynamics of the lime-tree forests (Drobyshev et al, 2009) evidence that the lime-tree woodlands can exist without reproduction during 400 years as a minimum. In accordance with the data provided by C.D.…”

Section: Resultsmentioning

confidence: 99%

The features of lime stands on permanent research plots in Leningrad region

Dobrovolsky¹,

Antonov²

2018

Research for Rural Development

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The objects of research are the lime-tree forests of the Leningrad region. The studies were carried out on 2 permanent plots established by the authors in May 2013 in the Lisino forest district (Leningrad region, Russia). The goal of research was to obtain a complex characteristic of stands dominated by linden (Tilia cordata). The objective of the research included a taxation and geobotanical description on permanent plots and studies of the soil cover (morphological and agrochemical characteristics of soils). The general health status of stands on the surveyed areas was determined as satisfactory-mean score 2.5 and 2.8 (relevant health status was determined with the help of the following 6-grade scale for each tree: 1-no signs of weakening; 2-weakened tree; 3-very weakened tree; 4-partial mortality of the tree; 5-dead-standing trees of the current year; 6-dead-standing trees of previous years). The average mortality rate varies from 3.05% year-1 on the sample plot 2 to 5.7% year-1 on the sample plot 1. Vegetation on sample plots attributes to a nemorose-herbal series of forest types, soils-to a podzolic type with a weak development of the podzol-forming process. They were well-mediated ones by humus in the upper horizon. This fact was facilitated by the lime litter: a lime has a deep root system to take up nutritional chemicals from a greater depth, where moraine loams enriched with calcium carbonate located. Old-aged forests of this type are being in the phase of gap dynamics now. This means that they can occur for a rather long time in the same place, however, the lime-tree forests of natural origin are constantly under threat of being replaced by spruce. The results of our study have shown that low levels of soil mineral nutrients supply are sufficient for the successful linden growth.

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Tree mortality in a mixed deciduous forest in Northwestern Russia over 22 years

Cited by 6 publications

References 36 publications

Modeling individual-tree mortality in Pyrenean oak (Quercus pyrenaica Willd.) stands

Modeling individual-tree mortality in Pyrenean oak (Quercus pyrenaica Willd.) stands

Differential effects of climate variability on forest dynamics along a precipitation gradient in northern Patagonia

The features of lime stands on permanent research plots in Leningrad region

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