[The losses of nutrients by fire in a savanna vegetation of Trachypogon].
The losses of nutrients by fire were assessed in a Trachypogon savanna located in Calabozo, Venezuela. About 95% of the biomass, 97% of N, 61% of P, 76% of K and 65% of Ca and Mg were transferred to the atmosphere. Ash deposition returned between 21-34% of Mg, Ca, K and P and 0.2% of N. Previous data indicated that precipitation and atmospheric fixation (in the case of N) could replace the rest of N, Ca, K and Mg transferred to the atmosphere. As a consequence of frequent burning (annual or biannual), the soil of the savanna showed lower organic matter and available P and K content when it is compared with a 32 year protected savanna.
Hernández-Valencia
Ismael
I
Instituto de Zoología Tropical, Universidad Central de Venezuela, Apdo, Postal 47058, Caracas 1041. A. Venezuela. ihernand@strix.ciens.ucv.ve
López-Hernández
Danilo
D
D002118:Calcium / Q000032:analysis; D004784:Environmental Monitoring; D005390:Fires; D007287:Inorganic Chemicals / Q000032:analysis*; D008274:Magnesium / Q000032:analysis; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D011188:Potassium / Q000032:analysis; D012987:Soil / Q000032:analysis*; D014197:Trees
D007287:Inorganic Chemicals; D012987:Soil; D010758:Phosphorus; D008274:Magnesium; D009584:Nitrogen; D011188:Potassium; D002118:Calcium