ABOVEGROUND BIOMASS GROWTH AND YIELD OF FIRST ROTATION CUTTING CYCLE OF Acacia AND Eucalyptus SHORT ROTATION DENDROENERGY CROPS

Abstract

-Chile has strong interest in biomass production for the purpose of generating bioenergy to accomplish environmental standards for clean energy production. However, no yield or productivity information is available about forest crop plantations established at high-initial planting densities dedicated to energy production. The objective of the present study was to provide long-term results of short-rotation forest crops research trials, investigating first cutting cycle most promising species biomass production. Plantations of Acacia melanoxylon, Eucalyptus camaldulensis, Eucalyptus globulus, and Eucalyptus nitens were established at initial stockings of 5,000; 7,500 and 10,000 trees ha -1 on marginal sites with important nutritional and hydric limitations in the Biobío Region, Chile. After 48 months, E. camaldulensis reached the highest biomass yield at initial stocking of 7,500 trees ha -1 (22.5 Mg ha -1 ) on dry land granitic soils, and E. nitens reached 35.2 Mg ha -1 on sandy soils. Initial stockings and biomass yields were directly related, but strongly conditioned by mortality, where greater initial stocking concurred with greater mortality after 4 years. The collar diameter and total height growth was lower at higher stockings.Keywords: Bioenergy; Growth and biomass yield; Eucalyptus spp. PRIMEIRO CICLO DE CORTE DE CRESCIMENTO BIOMASSA ACIMA DO SOLO E PRODUTIVIDADE DE ENSAIOS DE DENDROENERGIA DE Acacia E EucalyptusRESUMO -O Chile tem um forte interesse na produção de biomassa com o objetivo de gerar bioenergia para cumprir padrões ambientais para a produção de energia limpa. No entanto, não há informações de produtividade ou produtividade disponíveis sobre plantações de culturas florestais estabelecidas em densidades de plantio elevadas, dedicadas à produção de energia. O objetivo do presente estudo foi fornecer resultados a longo prazo de estudos de pesquisa de culturas florestais de rotação curta, investigando o primeiro ciclo de corte, a produção de biomassa de espécies mais promissoras. As plantações de Acacia melanoxylon, Eucalyptus camaldulensis, Eucalyptus globulus e Eucalyptus nitens foram estabelecidas em meias iniciais de 5.000; 7.500 e 10.000 árvores ha -1 em locais marginais com importantes limitações nutricionais e hídricas na Região Biobío, no Chile. Após 48 meses, E. camaldulensis atingiu o maior rendimento de biomassa na base inicial de 7.500 árvores ha -1 (22,5 Mg ha -1 ) em solos graníticos de terra seca e E. nitens atingiu 35,2 Mg ha -1 em solos arenosos. As meias iniciais e os rendimentos de biomassa foram diretamente relacionados, mas fortemente condicionados pela mortalidade, onde maior estocagem inicial concordou com maior mortalidade após 4 anos. O diâmetro do colar eo crescimento da altura total foram menores nas meias mais altas Palavras-Chave: Bioenergia; Crescimento e produção de biomassa, Eucalyptus spp. 2Revista Árvore. 2017;41(6):e410608 ACUNA E et al.

Water Availability Controls the Biomass Increment of Melia dubia in South India

“…A power-law growth curve represented the changes in AGB with increasing woodlot age well for the studied stands between one and nine years of age (Figure 3). Our findings are in line with several previous studies in monocultural short-rotation tree plantations showing similar relationships (e.g., [44,78,89,90]).…”

Growth, hydraulics and functional traits of Melia dubia across a steep climatic gradient in southern India

“…4.3). Our findings are in line with several previous studies in monocultural short-rotation tree plantations showing similar relationships (e.g., Paula et al, 2013;Arora et al, 2014;Acuña et al, 2017).…”

Carbon Sequestration Potential of Forest Invasive Species: A Case Study with Acacia dealbata Link

“…(2010) compared acacia species with other short-rotation common Southern European countries crops, such as Italy, from a techno-economic perspective of production viability [38]; Lenis et al (2013) also studied the use of short-rotation crops for bioenergy with acacias and eucalyptus in Colombia, but focused more on the perspective of the physico-chemical properties of derived fuels and their potential for energy recovery [39]. This dispersion of studies and research work, examples of which can be found in Brazil [40][41][42], South Africa [43,44], China [45,46], in addition to those already widespread in Europe or the United States of America [47,48], highlights the need for these regions over the past few years to control the dispersion of species belonging to a genus originating mainly from Australia, which has spread to practically all regions of the world, causing serious problems to the local biodiversity, as they enter into direct competition with indigenous species [49].…”