By R.K. Wieder, D.H. Vitt

This can be the 1st actually ecosystem-oriented ebook on peatlands. It adopts an ecosystems method of figuring out the world's boreal peatlands. the focal point is on biogeochemical styles and procedures, construction, decomposition, and peat accumulation, and it offers additional info on animal and fungal range. A habitual subject is the legacy of boreal peatlands as extraordinary accumulators of carbon as peat over millennia.

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3,000 cal. BP in central Finland, and ca. 2,000 cal. BP in northern Finland (Korhola and Tolonen 1996). The general pathways of hydroseral (and fen to bog) succession can be reverted as a result of strong or abrupt allogenic influences such as cli- The Postglacial Development of Boreal and Subarctic Peatlands 33 Fig. 3. Hydroseral succession in a boreal peatland near Beauval (west-central Canada) (adapted from Kuhry 1997, copyright 1997, with permission from National Research Council Research Press, Canadian Journal of Botany) mate change and flooding.

Fens influenced by more nutrient-rich inflows and higher flow rates can have a mesotrophic nutrient status. Communities with eutrophic nutrient status are restricted to non-peat-forming wetlands (marshes and southern swamps). This oligotrophic–eutrophic nutrient gradient is independent of the “mineral” gradient composed of pH, base cations (Na+, K+, Ca2+, Mg2+), and associated anions (HCO3–, CO32–, SO42–, Cl–) (Vitt and Chee 1990). The formation of peat and the differentiation of various bog and fen types occurs along this mineral gradient (see Fig.

Zonobiome VIII is characterized by short summers and long winters, coniferous, evergreen vegetation, and podzolic upland soils (Chap. 1). Precipitation is variable, ranging from annual total precipitation of 2,000 to about 250 mm; however, because of short cool frost-free seasons even when precipitation is quite low it exceeds potential evapotranspiration. Ecological Studies, Vol. H. 2 Peatland Initiation Across the boreal zone, peatlands originate by four processes (Chap. 3). The most common appears to by paludification (or swamping) wherein peat forms on previously drier, vegetated habitats over inorganic soils and in the absence of a body of water, generally owing to a regional water table rise and associated climatic moderation.

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