Autor(es):
Lopez-Diaz, M.L. 
; Moreno, G. ; Bertomeu, M.
Data: 2014
Identificador Persistente: http://hdl.handle.net/10400.5/7265
Origem: Repositório da UTL
Assunto(s): silvopastoral management; wood production
Detalhes do Documento
Silvopastoral management for quality wood production
Descrição
Poster In the last decade, hardwood plantations have substantially increased in many Spanish regions. In order to grow trees for high quality timber in short rotations, an intensive management, with high economic and environmental costs. The control of competing herbaceous vegetation is required for avoiding tree-herbage competition and fire risk. Silvopastoral management could allow reducing the economic costs and optimize their environmental functions. This study was carried out in various intensive 15 year old plantations of walnut located in Extremadura (Spain). A comparison of different herbaceous layer control was realized: harrow, brushcutter and grazing on natural grassland combined with different doses of irrigation. The objective of this study is to evaluate the profitability of each technique and their environmental implications. The nutritional and physiological status of trees was analyzed, as well as their growth (diameter increment). In addition, the temporal dynamics of soil moisture profile, available nutrients in the soil and nitrate leaching were studied. The maximum tree growth was observed with harrowing (where the highest available N and Ca in soil were observed) and grazing treatment (where P availability in soil was increased) both combined with the highest level of irrigation (that produced an increment of P and K content in leaves). The lowest tree growth was observed with brushcutting, in spite of this treatment, as horrowing, improved the N leaf level. Moreover, brushcutting affected positively to organic matter content and produced the lowest nitrate leaching in soil (in the first 30 cm depth). Respect to nitrate leaching, the difference among treatments was not significantly below 30 cm deep which reduces environmental hazard. There was no difference in physiological status of trees and soil moisture. Therefore, silvopastoral systems can be compatible with the medium-long term hardwood timber production, with great current and future demand, developing an environmentally efficient production system.
Poster In the last decade, hardwood plantations have substantially increased in many Spanish regions. In order to grow trees for high quality timber in short rotations, an intensive management, with high economic and environmental costs. The control of competing herbaceous vegetation is required for avoiding tree-herbage competition and fire risk. Silvopastoral management could allow reducing the economic costs and optimize their environmental functions. This study was carried out in various intensive 15 year old plantations of walnut located in Extremadura (Spain). A comparison of different herbaceous layer control was realized: harrow, brushcutter and grazing on natural grassland combined with different doses of irrigation. The objective of this study is to evaluate the profitability of each technique and their environmental implications. The nutritional and physiological status of trees was analyzed, as well as their growth (diameter increment). In addition, the temporal dynamics of soil moisture profile, available nutrients in the soil and nitrate leaching were studied. The maximum tree growth was observed with harrowing (where the highest available N and Ca in soil were observed) and grazing treatment (where P availability in soil was increased) both combined with the highest level of irrigation (that produced an increment of P and K content in leaves). The lowest tree growth was observed with brushcutting, in spite of this treatment, as horrowing, improved the N leaf level. Moreover, brushcutting affected positively to organic matter content and produced the lowest nitrate leaching in soil (in the first 30 cm depth). Respect to nitrate leaching, the difference among treatments was not significantly below 30 cm deep which reduces environmental hazard. There was no difference in physiological status of trees and soil moisture. Therefore, silvopastoral systems can be compatible with the medium-long term hardwood timber production, with great current and future demand, developing an environmentally efficient production system.
Tipo de Documento
Outro
Idioma Inglês
Idioma Inglês
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