Measurements at ICP Forests level ll plots soil solution ozone meteorology Soil temp.&moisture perm.increase B FW Institut fur Waldokologie und Boden
Measurements at ICP Forests level II plots meteorology perm. increase ozone soil solution Soil temp.& moisture
Scheme of level ll monitoring plot Stand | Open land Litter Dendrome radiation Wind velocity sampling measurements ters air moisture & temperature Solar digital panel camera precipitation measure- precipitation ments sampling soil moisture passive Data logger temperature sampler data transfer soil GSM solution precipitation sampling sampling open land measure- ment tower
Scheme of level II monitoring plot Litter sampling precipitation sampling soil solution sampling soil moisture & temperature Dendrometers air moisture & temperature Data logger data transfer GSM digital camera radiation measurements Wind velocity precipitation measurements passive sampler Solar panel precipitation sampling open land measurement tower Stand Open land
Carbon-background and theory ·Large pool Pool changing slowly -relatively little changes within 10,20 years many interactions with other parameters Interdependance with nitrogen(N) Institut fur Waldokologie und Boden
Carbon – background and theory • Large pool • Pool changing slowly – relatively little changes within 10, 20 years • many interactions with other parameters • Interdependance with nitrogen (N)
Carbon -background and theory Soil carbon:2nd largest C-Pool following oceans +t(climate change):Kirschbaum(2000)little net change,because increased decomposition is mediated due to increased carbon input into soil as an effect of increased net primary production Sitch et al.(2008):increased CO2 efflux from soil;soils at least temporary carbon source Smith(2008):3 uncertainities (1)temperature sensitivity of SOM,especially"recalcitrant"pools (2)balance beween increased C-input (+NPP)and increased C- loss as an effect of more rapid decomposition(+soil respiration) (3)changes in water balance,change in atmospheric CO2 concentration),LUC. B F W nstitut fur Waldokologie und Boden
Carbon – background and theory • Soil carbon: 2nd largest C-Pool following oceans • + t (climate change): Kirschbaum (2000) little net change, because increased decomposition is mediated due to increased carbon input into soil as an effect of increased net primary production Sitch et al. (2008): increased CO2 efflux from soil; soils at least temporary carbon source Smith (2008): 3 uncertainities (1) temperature sensitivity of SOM, especially “recalcitrant” pools (2) balance beween increased C-input (+NPP) and increased Closs as an effect of more rapid decomposition (+ soil respiration) (3) changes in water balance, change in atmospheric CO2 concentration), LUC
Carbon-background and theory background to uncertainities: -Functionally defined ,labile"und ,recalcitrant"carbon pools-not analytically defined; -discussion Knorr(2005)et al.:old,,,stable"carbon is more temperature sensitive than,young"carbon both pools are equally sensitve to temperature(Grant,1991; Sierra Renault,1996,Fang et al.,2005) old,,stable"carbon is not temperature sensitive(Giardina& Ryan 2000) .-compare to basic assumptions in Yasso,later on Institut fur Waldokologie und Boden
Carbon – background and theory • background to uncertainities: – Functionally defined „labile“ und „recalcitrant“ carbon pools → not analytically defined; – discussion • Knorr (2005) et al.: old, „stable“ carbon is more temperature sensitive than „young“ carbon • both pools are equally sensitve to temperature (Grant, 1991; Sierra & Renault, 1996, Fang et al., 2005) • old, „stable“ carbon is not temperature sensitive (Giardina & Ryan 2000) • → compare to basic assumptions in Yasso, later on