Recovery of peat-forming layer after a fire on mesotrophic bog (Khabarovsk Territory)

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Abstract

The paper considers the structural organization of the peat active layer (acrotelm) of a mesotrophic bog in the Middle-Amur Lowland. Data on the phytomass and production of mosses as well as vascular plant roots are provided to describe the dynamics of the layer structure restoration after fire. It was established that the phytomass of live sphagnum mosses has recovered by 42% in 12 years after the fire, with a change in the dominating species. The production of dominant Sphagnum fuscum ((84 ± 14) g/m2) was 1.5 times more than the production of S. divinum ((54 ± 14) g/m2) before the fire, and than decreased by 1.5 times on the site that was unburned in 2008 and by 4 times in the burned site by the end of the observations. An analysis of the Polytrichum strictum phytomass dynamics during the pyrogenic succession of the phytocenose is provided. The phytomass of P. strictum in the 0–30 cm horizon rose by the end of the monitoring observations by (1537 ± 540) g/m2 on the burned site and by (2142 ± 366) g/m2 on the site not affected by the 2008 fire.

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About the authors

T. A. Kopoteva

Institute of Water and Ecology Problems FEB RAS

Author for correspondence.
Email: kopoteva@ivep.as.khb.ru
Russian Federation, Kim Yu Chen Str., 65, Khabarovsk, 680000

V. A. Kuptsova

Institute of Water and Ecology Problems FEB RAS

Email: victoria@ivep.as.khb.ru
Russian Federation, Kim Yu Chen Str., 65, Khabarovsk, 680000

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Supplementary files

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2. Fig. 1. Schematic map of the study area: А – the bog site unburned in 2008; Б – the site burned in 2008; 1 – secondary birch-aspen forest; 2 – Siberian pine-broadleaved forest; 3 – sedge-reedgrass swampy meadowes with meadowsweet; 4 – mesotrophic dwarf-shrub-sphagnum bog with larch; 5 – boundaries of the areas of mesotrophic bog, unburned in 2008; 6 − boundaries of the areas of the bog massif subjected to a series of burns and fires from early 1990s (moss-free dwarf-birch thicket); 7 – boundaries of the bog massif with vegetation cover completely burned by the fire of 2008; 8 − road; 9 − meliorative system (Kopoteva, Kuptsova, 2016a).

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3. Fig. 2. Botanical composition of the peat of the studied mesotrophic mire.

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4. Fig. 3. Dynamics of the acrotelm structure in unburned (A) and burned (Б) areas, g/m2: 1 – living roots of dwarf shrubs; 2 – dead roots of dwarf shrubs; 3 – falling leaves of dwarf shrubs; 4 – living roots of herbs; 5 – dead roots of herbs; 6 – living phytomass of Polytrichum strictum; 7 – mortmass of P. strictum; 8 – living phytomass of Sphagnum fuscum; 9 – S. fuscum tirr of a low degree of decomposition; 10 – living phytomass of S. divinum; 11 – S. divinum tirr of a low degree of decomposition; 12 – tirr of a high degree of decomposition; 13 – peat.

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5. Fig. 4. Dynamics of acrotelm structure recovery in a burned area: 1 – peat; 2 – tirr of a high degree of decomposition; 3 – tirr of Sphagnum divinum + S. fuscum of a low degree of decomposition.

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6. Fig. 5. Dynamics of tirr and peat fraction ratios in the unburned area: 1 – peat; 2 – tirr of a high degree of decomposition; 3 – tirr of Sphagnum divinum + S. fuscum of a low degree of decomposition.

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