Impact of land use changes on the hydrological properties of volcanic ash soils in South Ecuador.
The water retention at wilting point diminishes by an average 16%, after two years of cultivation. no recovery of the water retention was observed when fields are changed into pasture; It seems to be an irreversible event. The water retention loss is much larger at 15 cm depth (21%) than the reduction at 40 cm, beneath the plough layer. Organic matter is mainly responsible for the high water retention, forming stable aggregates with clay-sized particles. More than allophane. Loss of litter layer implies 16 mm water retention.
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