Effects of lime and sewage sludge on the relationship between tree cover and pasture production in a silvopastoral system on acid soil

摘要

Agroforestry systems include sustainable land management techniques that are promoted by the EU (Council Regulation 1698/2005) and are considered by farmers of different European countries as a management system to implement. Silvopastoral productionsystems depend on forest species development and tree density established, but also on soil fertilization management practices, which may modify the tree-pasture relationship. Pinus radiata is broadly used in the Atlantic biogeographic region of Spain and it is a fast-growing species with a very dense canopy that could limit pasture production if planted at a high density. One of the main factors limiting pasture productivity on forestlands, especially at early plantation stages, is the low soil fertility, making it necessary to add products to overcome the acidity of the soils and the low nutrient availability. The aim of this study was to evaluate the relationship between tree cover and pasture production mo. Pinus radiata stand developed on a very acid soil. The results obtained showed a negative linear relationship between litterfall biomass and pasture production and positive relationship between litterfall biomass and tree height.