Spatial Variability of Soil Ph and Phosphorus In Relation To Soil Run-Off Following Slash And-Burn Land Clearing In Sumatra, Indonesia.

TitleSpatial Variability of Soil Ph and Phosphorus In Relation To Soil Run-Off Following Slash And-Burn Land Clearing In Sumatra, Indonesia.
Publication TypeJournal Article
Year of Publication2003
AuthorsRodenburg J, Stein A, van Noordwijk M, Ketterings Q
ContactAuthorasb@cgiar.org
JournalSoil and Tillage Research
Volume71
Issue1
Pagination1-14
Date PublishedMay 2003
KeywordsIndonesia, resin-extractable p, rubber plantation, slash-and-burn, small-scale agriculture, soil ph, soil run-off, spatial variability
AbstractSlash-and-burn land clearing on sloping land may lead to increased soil run-off following disappearance of the protective vegetative cover. In turn, soil run-off and redeposition affects soil fertility and spatial patterns of fertility parameters in a field. This study seeks to clarify the role of spatial patterns of post-burn dead biomass (necromass) in soil run-off and redeposition and their combined effect on spatial patterns in soil pH and resin-extractable P. The study is carried out on a post-productive rubber (Hevea brasiliensis) agroforest in Sumatra, Indonesia. Soils are classified as Dystric Fluvisols. After slash-and-burn of vegetation, the field was planted with rubber seedlings and rice (Oryza sativa). For comparison the adjacent rubber agroforest site was sampled. Soil run-off is expressed here as the quantity of downward moving soil that passed the specific location of a flow trap. Existing physical soil run-off barriers and crop performance were scored. Despite serious soil run-off from the steeper upper slopes little soil was actually lost because of the slope form of the field, presence of natural soil run-off barriers, and the planted crop. Spatial variability of soil pH decreased at the expense of small-scale, within-strata, variability mainly because of the patchy distribution of soil run-off barriers. Soil run-off, aggravated by slash-and-burn, did not result in development of a clear soil fertility gradient down slope. In areas of high soil run-off potential, clear burns should be avoided because soil run-off barriers like remnants of slash-and-burn and surface litter maintain the soil and its fertility.
URLhttp://www.sciencedirect.com/science/article/pii/S0167198702001411
DOI10.1016/S0167-1987(02)00141-1