The Dilemma of Amazonian Development by Emilio F. Moran

Author:Emilio F. Moran [Moran, Emilio F.]
Language: eng
Format: epub
Tags: Political Science, General
ISBN: 9780865313736
Google: BK6bDwAAQBAJ
Goodreads: 1002442
Publisher: Westview Press
Published: 1983-04-05T00:00:00+00:00

Other Factors That Affect Pasture Productivity

While the soil changes after conversion are neither as catastrophic nor as beneficial as much of the literature suggests, there are other soil and vegetational effects that also influence pasture productivity. Figure 6.7 shows the increase in soil bulk densities that eventually double with increasing pasture age. High soil bulk density results in reduced infiltration that can affect the rate of sheet erosion (Schubart 1976). Erosion rates under young pastures have been studied by MacGregor (1980) in the Caquetá region of Colombia, where it was found that pastures have low erosion losses. The study did not include grazing animals or the influence of periodic soil exposure after burning, so the results must be extrapolated with caution.

Figure 6.7. Changes in bulk density after conversion from forest to pasture

Sources: Clay-loam Oxisol compiled from Hecht (1982a) Clayey Oxisol, loamy Ultisol, and loamy Oxisol compiled from Falesi (1976)

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