Omission of nitrogen fertilizer on second rotation sites: effects onPinus radiatagrowth in southern Australia

Productivity of three successive rotations of P. radiata plantations in South Australia over a century

“…Boomsma et al (1997) found a close relationship between the growth of four-year-old stands and cumulative rainfall received from planting, across 10 2R sites. Monthly mean rainfall and evaporation over 64 years show variations (Fig.…”

“…This intensive management aimed to achieve early ''site capture'' helped to increase production on 3R sites. However, it also became clear that such approaches are only an interim measure, because broad scale growth responses to early applications of N (Nambiar and Cellier, 1985;Nambiar and Bowen, 1986;Boomsma et al, 1997) and phosphorus (Fife and Nambiar, 1999) were limited or absent. This lack of response is partly because, as discussed earlier, clear felling and site management practices increase the rates of nutrient availability and thus there is an asynchrony between transient increase in nutrient availability and the capacity of trees to take up nutrients (Smethurst and Nambiar, 1989).…”

“…Competition by vegetation, primarily for available water but also for nutrients during tree growth from planting to canopy closure is a critical factor determining productivity in this water and nutrient limited environment (Woods, 1976;Sands and Nambiar, 1984;Boomsma et al, 1997). Species composition of weeds in plantations at the same site has been changing with time both during the rotation and between rotations.…”

“…0.79 cg cm À2 s À1 ) . Bracken fern (Pteridium esculentem) is drought tolerant and maintains green fronds throughout the year (Boomsma et al, 1997), minimising tree response to nutrient applications. During the period when 2R decline emerged, cultivation followed by a degree of manual weeding was the main weed control method.…”

Implementing Australian forest management practices into a full carbon accounting model

“…There are few publications documenting the history of forest management in Australia (exceptions being Florence, 1996;Boomsma et al, 1997). Most information is either in literature such as annual reports, technical reports (for example, Lewis et al, 1976), or held as corporate knowledge.…”