Nep Gpp R

GPP is defined as the amount carbon dioxide that is assimilated by plants through photosynthesis. Alternatively, we can define GPP as the sum of net primary productivity, NPP, and autotrophic respiration, Rau0o. As a rule of thumb, autotrophic respiration, or NPP, constitutes about half of GPP (Gifford 1994), and Ruuto is about two-thirds of ecosystem respiration (Falge et al. 2002).

Ecosystem respiration, Reco, is more complex and consists of autotrophic respiration by the leaves, plant stems, and roots (Rautt) and heterotrophic respiration by the microbes and soil fauna (R, ^ ):

^ heteoro

Adapted from Sanderman et al. 2003

Adapted from Sanderman et al. 2003

Figure 15.1. Relation between carbon content in the top meter of soil and mean annual temperature. The data are associated with the sites in the FLUXNET network (adapted from Sanderman et al. 2003).

Figure 15.1. Relation between carbon content in the top meter of soil and mean annual temperature. The data are associated with the sites in the FLUXNET network (adapted from Sanderman et al. 2003).

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