A simulation model of the carbon cycle in land ecosystems (Sim - CYCLE): a description based on dry - matter production theory and plot - scale validation (pnas.org)
These variations originate primarily from fluctuations in carbon uptake by land ecosystems driven by the natural variability of the climate system, rather than by oceans or from changes in the levels of human - made carbon emissions. (sciencedaily.com)
Agriculture and forestry services should focus on techniques that can make small farms viable productive units while protecting the integrity and productivity of land ecosystems. (religion-online.org)