Amount and fall rates of snags in the primeval middle boreal spruce forests of the “vepssky forest” reserve

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Abstract

In view of global climate change and biodiversity decline, long-term research in primeval forests escaped from timber harvesting is especially important. We aimed at analysing the dynamics of number and volume of standing dead trees (snags), as well as the patterns of tree mortality and longevity of snags in primeval middle-boreal spruce forests. The study is based on a database of tree inventories on the eleven permanent sample plots over 25—46 years. The volume of snags during the period from 1971 to 2019 varied from 0,4 to 164 m3 ha-1 with an average annual “turnover” rate (the period from tree death to snag fall) from 0,07 to 32,7 m3 ha-1 year-1. In several biogeocoenoses, the peaks in tree mortality through decline after windthrows were observed, resulting in the stock of coarse woody debris being comparable to the growing stock of a forest stand. The rate and mode of tree mortality and the species distribution of snags depended on the site moisture regime, tree species composition and age structure of the forest stand. Before death, some trees were weakened for a period of up to 46 years. The time of tree weakening before death (the period from the moment when mechanical damage, traces of insect activity, diseases, etc. were noted in the tree, until the moment when a tree died) did not have a significant effect on the duration of snag longevity. The duration of snag longevity varied from 2 to 30 years or more depending on interrelated factors: tree species and size, moisture conditions, tree species composition of forest stand, and successional status of the biogeocenosis.

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E. A. Kapitsa

Saint-Petersburg Forestry University

Author for correspondence.
Email: kapitsa@list.ru
Russian Federation, Institutskiy ln. 5, Saint-Petersburg, 194021

A. A. Korepin

Saint-Petersburg Forestry University

Email: kapitsa@list.ru
Russian Federation, Institutskiy ln. 5, Saint-Petersburg, 194021

E. V. Shorokhova

Saint-Petersburg Forestry University

Email: kapitsa@list.ru
Russian Federation, Institutskiy ln. 5, Saint-Petersburg, 194021

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2. Fig. 1. Dynamics of stocks of hardy trees in biogeocenoses of various successional status in various forest growing conditions. E-spruce (Picea abies (L.) H. Karst.), B — birch (Betula Pendula Roth, B. pubescens Ehhrh.), Wasp — aspen (Populus tremula L.), C-pine (Pinus Sylvestris L.).

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3. Fig. 2. Distribution of the number of dry-standing trees by the rate of transition from the "deadwood" to "deadwood" state, depending on forest conditions. The total number of dry-standing trees (per hectare) for PP is presented for the accounting period from the 1970s to 2019. E-spruce (Picea abies (L.) H. Karst.), B — birch (Betula Pendula Roth, B. pubescens Ehhrh.), Wasp — aspen (Populus tremula L.), C-pine (Pinus Sylvestris L.).

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