Nutrient cycling in age sequences of two Eucalyptus plantation species

Biomass and carbon storage of Eucalyptus and Acacia plantations in the Pearl River Delta, South China

“…The sources of secondary biomass accounted for, respectively, 9.2-10.2% and 12.0-20.3% of the total biomass present in the Eucalyptus and Acacia plantations, which demonstrates that secondary biomass cannot be ignored in estimates of biomass accumulation or carbon fixation in a subtropical forest. The size of the individual Eucalyptus secondary biomass components was somewhat lower than has been recorded in native Eucalyptus forests (Woldendorp and Keenan, 2005;Turner and Lambert, 2008). Allelopathy may well have been responsible for much of this reduction, since it functions to suppress the germination and growth of a number of native species (Ahmed et al, 2008;Fang et al, 2009;Zhang and Fu, 2009).…”

“…As a result, there is a lack of long term characterization of biomass accumulation or carbon fixation in such plantations. Efforts have been made to study the dynamics of secondary biomass components accumulation by targeting the CWD (Woldendorp and Keenan, 2005), the understory and litter in Mediterranean and tropical Eucalyptus forests (Carneiro et al, 2007;Turner and Lambert, 2008), litter in Mediterranean Eucalyptus forests (Inagaki et al, 2010), and litter in tropical Acacia forests (Inagaki et al, 2010). However, the long-term relative contribution of secondary biomass accumulation to Eucalyptus and Acacia plantations ecosystem still remains unclear.…”

Nutrient relations during an eucalyptus cycle at different population densities

“…It is known, for example, that the nutrient use efficiency generally increases with increasing forest age due to an increase of the stem wood proportion (low nutrient concentration component) and the reduction of bark, branch, and leaf proportions in the total biomass of the aging tree (Miller, 1984). Besides alterations in the proportions of biomass with different nutrient contents, modifications of nutrient accumulation in different tissues are also observed (Turner & Lambert, 2008). The trunk nutrient content is reduced as the tree ages, due to the internal cycling during the transformation of sapwood into heartwood in the course of the tree-aging process (Reis & Barros, 1990;Bouillet et al, 2008).…”

Sustentabilidad en el uso de nutrientes de plantaciones dendroenergéticas en dos suelos marginales de la Región de Biobío, Chile

“…Al mismo tiempo esta reducida frecuencia entre cosechas podría aumentar la compactación de los suelos y la extracción principalmente de nitrógeno y fósforo, entre otros nutrientes, cuando se aprovechan fustes con follaje y corteza (Turner & Lambert, 2008;Volk, Verwijst, Tharakan, Abrahamson & White, 2004). Esto puede afectar negativamente los rendimientos en el corto y mediano plazo (5-30 años) primordialmente en áreas plantations with Eucalyptus camaldulensis, E. nitens, E. globulus and Acacia melanoxylon: at densities of 5000, 7500 and 10000 trees per hectare were established at two sites in marginal forest production in contrasting soils, sands and granitic located in the region of Biobio, Chile.…”

“…Similar a lo observado en la forestación tradicional, las plantaciones dendroenergéticas establecidas en suelos con uso pasado agrícola han aumentado los niveles de materia orgánica, la calidad de agua, la microfauna y flora del suelo (Mann & Tolbert, 2000). Sin embargo, estos efectos son sitio-específicos y algunas investigaciones han cuestionado efectos de acidificación y reducción de nutrientes por algunas especies, y posibles interacciones con el sitio, relaciones ecológicas y el impacto de las fertilizaciones requeridas (Turner & Lambert, 2008).…”