Low Precipitation High

FIGURE 8.3 Modified diagram of the distribution of major ecosystem and soil types in relation to precipitation and temperature. Values for elements of structure and function that are used to characterize ecosystems are given for each type. B, total plant biomass in Mg ha"1 y"1; P, total plant production above ground in Mg ha"1 y"1; N, nitrogen uptake by plants in kg ha"1 y"1; AET, actual evapotranspiration in millimeters of water per year; PET, potential evapotranspiration in millimeters of water per year. Reprinted from Aber and Melillo (2001) with permission from Elsevier.

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Organic Gardeners Composting

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