Abstract
Evidence of Climate Mitigation Feedbacks by Global Forest Cover Expansion during the Pliocene
Highlights
Deforestation refers to the global decrease in forest area arising from natural or anthropogenic causes
The overall impact of forestation on climate depends on carbon uptake by photosynthesis, which leads to reduced radiative forcing, and on other effects associated with the development of new forests, the decrease in albedo, which exerts a positive radiative forcing on climate [2,3]
In quite a different study which introduced an interesting time factor under New Zealand conditions, Kirschbaum et al [3] reported that forest albedo and carbon-storage effects were of similar magnitude for the first four to five years after tree planting, but as the stand aged, carbon sequestration increasingly dominated, giving a net cooling effect
Summary
Deforestation refers to the global decrease in forest area arising from natural or anthropogenic causes. The main differences between these findings from different regions relate to the role of snow (snow plays an important role in the boreal zone, but only a minor one in New Zealand), the growth rate of trees and their carbon-storage potential (much greater in New Zealand than in more slowly growing boreal forests), and annual incident solar radiation (greater in New Zealand than in the boreal zone) [2,3] These studies show that the regional effects of forest cover may be conflicting, but we must consider that the global result is clearly a net balance of regional effects that take time.
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