Cout λ m τ ( ) τ. d 0 ∞ ∫ = = Cin Cout – p λ m τ d 0 ∞ ∫ – p m d τ d ----- τ d
- E. D. Schulze, A. Prokuschkin, A. Arneth, Tellus, Ser. B
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 of carbon deposition in a sphagnum column can be measured quantitatively if the rates of annual growth and degradation of sphagnum in layers of different ages are known. However, it is very difficult to obtain such data, because the necessary measurements should be performed for many years in bog ecosystems from different natural and climatic zones [2, 3]. Various methods are used to solve this problem. The net ecosystem efficiency of carbon accumulation (NEE) averaged over many years (hundreds and thousands of years) is calculated from peat layer thickness and basal age as determined using the radiocarbon method . In contrast, direct measurements of carbon fluxes over bog ecosystems revealed annual variation in the NEE value . The mean rate of peat accumulation averaged over many years is often determined using the model of vertical growth of bogs, which is based on questionable assumptions . In this work, we suggest a method of estimation of this parameter. This method combines theoretical and experimental approaches to the problem and has the following specific features: (1) it can be applied to a large number of bog ecosystems and (2) it is based on the peatland characteristics that can be measured relatively easily.