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 country ofthe paintings in learn on weather switch (Climate switch 1995). the freshest study findings were divided into 3 volumes: • the technological know-how ofClimate switch (working crew I), • the affects, Adaption and Mitigation of weather switch (working workforce II), and • the commercial and Social Dimensions ofClimate swap (working crew III) there's a common consensus severe switch in weather can basically be shunned if the longer term emissions of greenhouse gases are lowered significantly from the company as ordinary projection and if while the normal sinks for greenhouse gases, specifically that of CO , are maintained at present point or 2 preferrably elevated. Forests, forestry and forestry are very important components of the worldwide carbon cycle and for that reason also they are a part of the mitigation potentials in not less than a threefold means: 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 expected 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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4 x 10 9 m3 . 2 m3 ha- 1 yr-I may not apply to large areas of unproductive and unused forests, and they estimate that the loss in growing stocks in Siberia was actually 6-7 x 109 m3 over the 22-year period. They note that the los ses were higher in more recent years. 75 x growing stock)(Kauppi 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).
Annual net flux of carbon from global changes in land use, including those changes involving forests and those not involving forests (from Houghton and Hackler 1995) The total net loss of carbon from temperate zone and boreal forests (32 Pg) was about half ofthe amount lost from tropical forests (68 Pg) over the 140-year period. Human activities responsible for the loss of carbon from forests were primarily the conversion of forests to agricultural lands, and secondarily the harvest of wood (Fig.
The Figure shows the changes in forests alone; including non-forest ecosystems would increase the net loss from soils by about 15 PgC. l from harvests (Fig. 2) is surprising since the world's population increased about five fold over the period 1850 to 1990. According to the analysis by Houghton and Hackler (1995), global rates of harvest also increased by a factor of five. 9 ae:. 8 - - Expansion of Croplands P·? 3 i! 1 --- ~-----------------' .............. --- ",,' I"~ \, '"'- .... O~~~~MT~~~~Tn~~MT~~~~Tn~~~nT~~~ 1850 1860 1870 1880 1890 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 Year Fig.
Carbon Dioxide Mitigation in Forestry and Wood Industry by Prof. Dr. Gundolf H. Kohlmaier, Dr. Michael Weber, Dr. Dr. Richard A. Houghton (auth.)