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.... Whenthe evaluation of a scenario is completed, that instance is removed ( ), and a new instance is created ( ) with the next scenario. The model makes no attempt to employ optimization techniques (=-=Nocedal and Wright, 2000-=-; in part because local optima may make this difficult; see Figures 7, 8 and 13), but simply evaluates all the scenarios specified. Computationally, this may not be very efficient, but the model in Fi...

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...as suffered mortality or other disruptions to the original deign (Bristow et al., 2006). In the past, the requirement for tedious data preparation and specialist computer skills (Huston et al., 1988; =-=Grimm and Railsback, 2005-=-) have hamperedwidespread use of individual-based modelling (Grimm, 1999; McIntosh et al., 2005), but modern packages such as Simile (Muetzelfeldt and Massheder, 2003) make the approach more accessib...

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.... In the past, the requirement for tedious data preparation and specialist computer skills (Huston et al., 1988; Grimm and Railsback, 2005) have hamperedwidespread use of individual-based modelling (=-=Grimm, 1999-=-; McIntosh et al., 2005), but modern packages such as Simile (Muetzelfeldt and Massheder, 2003) make the approach more accessible. Many researchers remain unaware of the utility of such packages in fa...

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...ally when the trial has suffered mortality or other disruptions to the original deign (Bristow et al., 2006). In the past, the requirement for tedious data preparation and specialist computer skills (=-=Huston et al., 1988-=-; Grimm and Railsback, 2005) have hamperedwidespread use of individual-based modelling (Grimm, 1999; McIntosh et al., 2005), but modern packages such as Simile (Muetzelfeldt and Massheder, 2003) make...

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...cies, Eucalyptus, Acacia Introduction Plot-based analyses of replacement series trials remain the norm for mixed-species research, despite known limitations and demonstrations of better alternatives (=-=Connolly et al., 2001-=-; Park et al., 2003; Vanclay, 2006). Individual-based analyses of tree growth data offer insights not possible with plot-based analyses, especially when the trial has suffered mortality or other disru...

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...al-based analysis of inter-specific competition data. Use of Competition Indices in Mixed-species trials Evidence for the first proposition is easy to collect, but hard to interpret. Reviews (such as =-=Forrester et al., 2006-=-) cite many publications that report relative yield, but few that report competition indices or response surfaces. This may be attributed partly to the convenience of a simple ratio such as relative y...

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..., our analysis is to be restricted to pairs within a defined distance, so we make the list of pairs conditional ( ) by specifying, e.g., distance<3 and distance>0, assuming (for the moment, following =-=Hegyi, 1974-=-) that the search radius will be 3 metres about each tree, and that trees do not pair with themselves (distance=0). [Figure 3 near here] Many competition indices rely on the relative size of trees; it...

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...2006). Individual-based analyses of tree growth data offer insights not possible with plot-based analyses, especially when the trial has suffered mortality or other disruptions to the original deign (=-=Bristow et al., 2006-=-). In the past, the requirement for tedious data preparation and specialist computer skills (Huston et al., 1988; Grimm and Railsback, 2005) have hamperedwidespread use of individual-based modelling ...

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... index should be the sum (cf. product) of the competition scores calculated for each pair, which are in turn based on Hegyi’s concept of relative size and distance (there are many alternatives, e.g., =-=Mailly et al., 2003-=-); that distance should be Euclidean, that relative size should be based on a ratio (cf. the difference), and that the search radius should be three metres. All these assumptions are transparent and u...

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...y designed for simulation modelling of agroforestry systems (Muetzelfeldt and Taylor, 1997), it has been used in a wide range of other contexts (Muetzelfeldt and Massheder, 2003; Prabhu et al., 2003; =-=Vanclay et al., 2003-=-, 2006; Bonanomi et al., 2005), and is equally suited to individual-based analysis of mixed-species plantings. The beauty of using Simile for such analyses is that its graphical user interface is intu...

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..., the requirement for tedious data preparation and specialist computer skills (Huston et al., 1988; Grimm and Railsback, 2005) have hamperedwidespread use of individual-based modelling (Grimm, 1999; =-=McIntosh et al., 2005-=-), but modern packages such as Simile (Muetzelfeldt and Massheder, 2003) make the approach more accessible. Many researchers remain unaware of the utility of such packages in facilitating analyses of ...

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...a Introduction Plot-based analyses of replacement series trials remain the norm for mixed-species research, despite known limitations and demonstrations of better alternatives (Connolly et al., 2001; =-=Park et al., 2003-=-; Vanclay, 2006). Individual-based analyses of tree growth data offer insights not possible with plot-based analyses, especially when the trial has suffered mortality or other disruptions to the origi...

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...delling of agroforestry systems (Muetzelfeldt and Taylor, 1997), it has been used in a wide range of other contexts (Muetzelfeldt and Massheder, 2003; Prabhu et al., 2003; Vanclay et al., 2003, 2006; =-=Bonanomi et al., 2005-=-), and is equally suited to individual-based analysis of mixed-species plantings. The beauty of using Simile for such analyses is that its graphical user interface is intuitive and helps to maintain a...

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...t computer skills (Huston et al., 1988; Grimm and Railsback, 2005) have hamperedwidespread use of individual-based modelling (Grimm, 1999; McIntosh et al., 2005), but modern packages such as Simile (=-=Muetzelfeldt and Massheder, 2003-=-) make the approach more accessible. Many researchers remain unaware of the utility of such packages in facilitating analyses of competition at the level of individual trees. This paper examines three...

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... Simile was originally designed for simulation modelling of agroforestry systems (Muetzelfeldt and Taylor, 1997), it has been used in a wide range of other contexts (Muetzelfeldt and Massheder, 2003; =-=Prabhu et al., 2003-=-; Vanclay et al., 2003, 2006; Bonanomi et al., 2005), and is equally suited to individual-based analysis of mixed-species plantings. The beauty of using Simile for such analyses is that its graphical ...

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...-based analyses of replacement series trials remain the norm for mixed-species research, despite known limitations and demonstrations of better alternatives (Connolly et al., 2001; Park et al., 2003; =-=Vanclay, 2006-=-). Individual-based analyses of tree growth data offer insights not possible with plot-based analyses, especially when the trial has suffered mortality or other disruptions to the original deign (Bris...

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...visual modelling environment available from Simulistics (www.simulistics.com) for most popular computer systems. While Simile was originally designed for simulation modelling of agroforestry systems (=-=Muetzelfeldt and Taylor, 1997-=-), it has been used in a wide range of other contexts (Muetzelfeldt and Massheder, 2003; Prabhu et al., 2003; Vanclay et al., 2003, 2006; Bonanomi et al., 2005), and is equally suited to individual-ba...

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...isplay to show the plan and various profiles. [Figure 9 near here]Using Simile to explore implications Once an equation describing the observed trends has been established with a statistics package (=-=Vanclay, 2002-=-), Simile can be used in a more conventional manner to examine the implications of the equation, and to examine theoretically-optimal planting designs and silvicultural regimes. To do this, the model ...

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...Bristow, pers. comm.): veuc = 0.00002663 d 2 h -0.0252 where veuc is volume (m 3 ) to 10 cm diameter under bark. Volumes of Acacia peregrina were estimated using a published equation for A. mearnsii (=-=Schonau, 1972-=-): log10(vacacia) = 1.9532 log10d +1.2315 log10h -1.74059 where vacacia is volume (m 3 ) to 5 cm diameter under bark. Two further assumptions were made regarding tree growth: that trees do not shrink,...