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Integration of process-based soil respiration models with whole-ecosystem CO2 measurements
- SUPPORTING INFORMATION Additional Supporting Information
, 2008
"... We integrated soil models with an established ecosystem process model (SIPNET, simplified pho-tosynthesis and evapotranspiration model) to investigate the influence of soil processes on mod-elled values of soil CO2 fluxes (RSoil). Model parameters were determined from literature values and a data as ..."
Abstract
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Cited by 4 (2 self)
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We integrated soil models with an established ecosystem process model (SIPNET, simplified pho-tosynthesis and evapotranspiration model) to investigate the influence of soil processes on mod-elled values of soil CO2 fluxes (RSoil). Model parameters were determined from literature values and a data assimilation routine that used a 7-year record of the net ecosystem exchange of CO2 and environmental variables collected at a high-eleva-tion subalpine forest (the Niwot Ridge AmeriFlux site). These soil models were subsequently evalu-ated in how they estimated the seasonal contribu-tion of RSoil to total ecosystem respiration (TER) and the seasonal contribution of root respiration
Soil Biology &
"... a r t i c l e i n f o e-C was sequestered er factoring in the C llulose input served. All rights reserved. The stability of global terrestrial C stocks such as soil organic matter (SOM) is mainly under environmental and biological control (Schmidt et al., 2011). It is also often affected by pulse in ..."
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a r t i c l e i n f o e-C was sequestered er factoring in the C llulose input served. All rights reserved. The stability of global terrestrial C stocks such as soil organic matter (SOM) is mainly under environmental and biological control (Schmidt et al., 2011). It is also often affected by pulse inputs of plant-originated C (plant residues and rhizodeposits), which induce ead pools of SOM 011). This cascade comprises increase in respiratory activity and in enzyme produc-tion, changes in amounts of easily-available C and of soluble C. This, in turn, alters the size and structure of the soil microbial commu-nity (Paterson, 2009; Kuzyakov, 2011) and triggers priming effects (PE), i.e. accelerated SOM decomposition. It remains unclear which drivers are responsible for the decomposition of heterogeneous SOMpools co-existing in soil but differing in age, turnover rates and
s t e a W
"... ing, ent co, P otos erg ss ed by past d ve- an biota has been fully appreciated, particularly in forest ecosystems, because of the size of the plants and the great spatial heterogeneity of the soils (Mikola and Kytöviita, 2002; Högberg and Read, 2006; Göttlicher et al., 2006). Tracking the incorp ..."
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ing, ent co, P otos erg ss ed by past d ve- an biota has been fully appreciated, particularly in forest ecosystems, because of the size of the plants and the great spatial heterogeneity of the soils (Mikola and Kytöviita, 2002; Högberg and Read, 2006; Göttlicher et al., 2006). Tracking the incorporation of current assimilated C into soil organisms through plant roots is difficult under natural soil (Simard et al., 1997; Siira-Pietikäinen et al., 2001; Brant et al., 2006). However, this method destructively disturbs soils and terminates the process of plant uptake of water and nutrients. In recent years, a number of studies have investigated the effects of eliminating photosynthate translocation to belowground on soil processes by physical girdling of trees. Tree girdling instanta-neously terminates the flux of photosynthates from tree canopy through the phloem to tree roots, while there is minimal imme-diate disturbance to the soil and roots (Högberg et al., 2001). Contents lists availab.e ls
in W, U Received in revised form
, 2010
"... impossible. Another reason is the high diversity of these commu-nities (Torsvik et al., 2002; Fierer et al., 2007b). biomass (Winogradsky, 1924) and r- versus K-selected organisms (Fontaine et al., 2003; Langer et al., 2004; Fierer et al., 2007a). Unfortunately these dichotomous definitions are eith ..."
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impossible. Another reason is the high diversity of these commu-nities (Torsvik et al., 2002; Fierer et al., 2007b). biomass (Winogradsky, 1924) and r- versus K-selected organisms (Fontaine et al., 2003; Langer et al., 2004; Fierer et al., 2007a). Unfortunately these dichotomous definitions are either incal-culable in situ or are determined post-hoc rendering them circular. One categorization of microorganisms in soil that does not suffer from many of the above shortcomings and that has been widely employed is the division between the major decomposer groups: fungi and bacteria (Waksman et al., 1928; Alexander,
