Soil Phosphorus Availability after Slash-And-Burn Fires of Different Intensities in Rubber Agroforests in Sumatra, Indonesia.

TitleSoil Phosphorus Availability after Slash-And-Burn Fires of Different Intensities in Rubber Agroforests in Sumatra, Indonesia.
Publication TypeJournal Article
Year of Publication2002
AuthorsKetterings Q, van Noordwijk M, Bigham J
ContactAuthorasb@cgiar.org, qmk2@cornell.edu
JournalAgricultural, Ecosystems and Environment
Volume92
Pagination37-48
Call NumberJA0182-04
KeywordsIndonesia, Oxisols, Phosphorus, Rubber agroforestry, slash-and-burn
AbstractLand clearing fires in Sumatra, Indonesia, caused enormous environmental problems for southeast Asia in 1997, but rubber farmers as well as large rubber and oil palm plantation owners continued to slash-and-burn due to the lack of an alternative that is equally quick, cheap, and capable of improving soil fertility. A partial alternative may be found in the reduction of the fuel load before the burn by harvesting and selling a larger fraction of the wood and, thus, changing the intensity of the fire and reducing particulate and greenhouse gas emission. An adequate phosphorus (P) supply is critical to crop production in Sumatra. Thus, it is important to understand the effects of such a reduction in fire intensity on crop P availability. Field and laboratory experiments were conducted to: (1) determine P sorption capacities and affinity constants for a forest soil exposed to different fire intensities in a controlled oven experiment (heat effects only); (2) compare the sorption characteristics of oven-burned soil with field-burned soil (heat and ash addition effects); and (3) determine the effects of fire-induced changes in soil properties on indices of P availability.
URLhttp://www.worldagroforestry.org/sea/publication?do=view_pub_detail&pub_no=JA0182-04