Land use and landscape effects on aggregate stability and total carbon of Andisols from the Colombian Andes

摘要: The Dosquebradas Basin, in the central coffee-growing region of Colombian Andes, covers 58 km2 between 1350 and 2150 m elevation. Soils this basin are mostly Melanudands. Soil sampling units were defined on basis land use (sun coffee, shade coffee pasture) slope. Samples from 76 sites collected during June–July 2002 to measure water stable aggregates, aggregate carbon concentration, total content C/N ratios, analyze effect size, use, landscape position (summit, shoulder, backslope) depth these properties. Analyses variance indicated an interaction aggregates while a main ratios. Higher percentages found under sun (95%) pasture (93%) compared (83%) at backslope position. Aggregate concentration was highest (95 g kg−1) summit (76.7 shoulder size (>2 mm, 1 2 mm <1 mm) did not have indicating that Andisols do conform hierarchy model. Total surface samples (0 5 cm) higher (26 tC ha−1) than (19 ha−1). Carbon (23 significantly different either one. most notable findings (a) generalized high (75% with above 90%) which point relatively stability Andisols, (b) significant differences particularly where incorporated almost 30% more into systems.