Validacion de un modelo erosion-productividad en suelo de los Andes venezolanos.
1995
Delgado F. | Lopez R.
In mountainous areas, soil erosion by water is one of the most important land degradation processes. The nature and dynamics of the erosion phenomenon have been substantially studied, but there is much to inquire about relationships between soil properties, as affected by erosion, and soil productivity. With the purpose of analyzing such relationships a model (Productivity Index) was developed to try to establish soil productivity values as a function of the following edaphic variables, closely related to growth and development of crops in tropical mountainous regions: available water capacity, clay content, bulk density, coarse fragment content, pH. Important application is its capacity to predict the erosion effect on soil productivity. By simulation of the erosion process throughout successive removal of top soil layers, the model generates productivity values for different removal levels. In order to validate this application of the model, the results obtained by simulation were compared with the field productivity values corresponding to different artificial removal levels of a Typic Humitropept toop soil. The model can be used for preliminary evaluation of the erosion impact on these soils of the mountainous regions, particularly when there is no field research information available to evaluate the soil erosion-productivity relationship.
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