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By Prof. Dr. Gundolf H. Kohlmaier, Dr. Michael Weber, Dr. Dr. Richard A. Houghton (auth.)

The lntergovernmental Panel on weather switch (IPCC) has lately summarized the nation ofthe paintings in study on weather switch (Climate swap 1995). the hottest learn findings were divided into 3 volumes: • the technological know-how ofClimate swap (working workforce I), • the affects, Adaption and Mitigation of weather switch (working team II), and • the industrial and Social Dimensions ofClimate switch (working workforce III) there's a basic consensus severe swap in weather can purely be kept away from if the longer term emissions of greenhouse gases are decreased significantly from the company as traditional projection and if even as the typical sinks for greenhouse gases, specifically that of CO , are maintained at this time point or 2 preferrably elevated. Forests, forestry and forestry are vital components of the worldwide carbon cycle and consequently also they are a part of the mitigation potentials in not less than a threefold manner: 1. through the period of time among 1980 and 1989 there has been a web emission of CO from adjustments in tropical land use (mostly tropical deforestation) of two 1. 6 +/- 1 GtC/a, yet whilst it used to be anticipated that the forests within the northem hemisphere have taken up zero. five +/- zero. five GtC/a and also different terrestrial sinks (including tropical forests the place no clearing happened) were a carbon sink ofthe order of l. three +/- l.

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The climatic conditions vary greatly along the south - north transect 1100 km in length. In the southem part of the country, the mean effective temperature sum of the thermal growing season (threshold + 5 0c) is 1100-1300 degree days, in the central part 800-1100 degree days, and in the northem part 500-800 degree days. As a result, forest growth is strongly limited by temperature especially in the northem part of the country, and temperature increase associated with climate change may have a strong influence on forest growth and productivity.

The magnitude of the release over 150 years is difficult to attribute to human activity. Sustained defore station of 3 x lO6 ha yr,l is unlikely. On the other hand, climatic variability does seem capable of causing such changes in terrestrial carbon. Gross exchanges of carbon between terrestrial ecosystems and the atmosphere, as a result of photosynthesis and respiration, are on the order of lOO PgC annually. Year-to-year variations may be on the order of 1-3 PgC globally (Dai and Fung 1993; Ciais et al.

1992). l (Shvidenko and Nilsson 1997). The net accumulation within the decade ofthe 1980s would have been less (Shvidenko and Nilsson, in press). l). 2 x 109 m3 yr'l) by dividing the difference in growing stocks of age classes by the difference in their ages (accounting for differences in the areas of each age class). The calculations were based on data for a single year, 1988, from inventory data reported by Alimov et al. (1989). l) and soils (39 TgC y(l), for a total sink of 662 TgC yr'l. fes and harvests, yielding a net accumulation of 410 TgC y(l for Russian forests.

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