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2 Polish Journal of Ecology

2 2003

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Woody biomass and annual production across a latitudinal gradient in Northern Scots pine (Pinus sylvestris) forests

Nagel L.

Polish Journal of Ecology

2003

Vol. 51, nr 4

471-479

To better understand how forest growth might be affected by climate, we observed patterns of forest growth (in terms of basal area, diameter, canopy height, and total biomass) in Scots pine forest ecosystems at nine stands along a northern latitudinal gradient (50 stopni N - 70 stopni N) crossing Poland, Lithuania, Latvia, Estonia and Finland. This gradient is characterized by a northward decline in average annual temperature (delta = c.9 stopni C) and precipitation (delta = c. 300 mm). Basal area, average diameter, canopy height and total biomass appear correlated with average annual temperature (P-values range from <0.002 to 0.096), but were not correlated with average annual precipitation. None of the measures of absolute growth or percent growth rates (averaged over four measurement periods) were correlated with temperature or precipitation. A framework for evaluating recent increases in biomass pools in northern systems is given, but data here are of insufficient power to confirm or refute hypotheses of recent increase in production of northern forests.

Carbon pools and storage along a temperate to boreal transect in Northern Scots pine (Pinus sylvestris) forests

Reed D., Nagel L.

Polish Journal of Ecology

2003

Vol. 51, nr 4

545-552

A significant portion of global terrestrial carbon is stored in forested ecosystems, particularly in systems north of 50 stopni N latitude. Carbon fluxes to and from these systems have the potential to greatly influence global terrestrial C storage, and provide feedback loops in the global carbon cycle. This study examines total ecosystem C storage, and its allocation among ecosystem components, in nine study sites located in Scots pine (Pinus sylvestris) forests located from 50 stopni N (southern Poland) to 70 stopni N (northern Finland). Results indicate a remarkable similarity in total ecosystem C, despite great deal of change in total C storage in these systems. The two component C pools that differ the most are the overstory biomass and the organic soil horizons; this raises the concern that these sites could be short-term sources of atmospheric C due to more rapid decomposition in the face of channing climate, but the overstory biomass could be a longer-term, possibly offsetting sink of atmospheric C.