Resumo

MARTINS, Afonso  e  PINTO, Goreti. The Effect of Located Subsoil Mobilisation Versus Continuous Subsoil Mobilisation on Soil Properties and Plant Response in Young Forest Plantations. Silva Lus. [online]. 2004, vol.12, n.2, pp.191-202. ISSN 0870-6352.

It is generally accepted that a gap of information exists relating to the more appropriate soil preparation techniques for forest plantations. Several solutions have been used without consistent results to support the adopted options. The purpose of the present study is to enhance the knowledge of the effects of soil preparation on soil properties and soil-plant interactions, demonstrated by the modifications of soil properties on plantation success and the establishment phase. In this investigation young Cupressus lusitanica and Quercus suber plantations were used, located at Avidagos, in Mirandela municipality (Terra Quente Transmontana). The soil preparation techniques used were: (a) located subsoil mobilisation, followed by two plough passes leaving furrow-hillock surface soil; (b) continuous subsoil mobilisation, also followed by two plough passes leaving furrow-hillock surface soil. In both treatments ditch, hillock, plantation lines and between plantation lines, were studied. The soil parameters investigated were modifications on soil profile morphology, nutrient concentrations, soil water availability and water regime during the dry season. Tree response was evaluated through root distribution, initial growing phase and planting failure. The results obtained show: (i) increase of soil depth and plant water availability with mobilisation; (ii) increase of soil nutrient amounts with mobilisation; (iii) similar plant behaviour in both soil preparation techniques; (iv) higher efficiency of located subsoil mobilisation in respect to benefits on soil properties.

Palavras-chave : forest soils; soil preparation techniques; forest systems.

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