Effects of initial stocking on stand development in even-aged mixed eucalypt regrowth: a preliminary model

Lockett, Eric; Goodwin, A. N.

doi:10.1080/00049158.1999.10674756

Cited by 7 publications

(7 citation statements)

References 2 publications

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“…Sites with different levels of initial conditions should also undergo succession at different rates (Martínez‐Ramos & García‐Orth, ; Martínez‐Ramos et al, ; Pickett & Cadenasso, ; Watt, ). For example, young sites with higher basal area tend to accumulate biomass at a faster rate compared to sites of similar age but with lower basal area (Babst, Bouriaud, Alexander, Trouet, & Frank, ; Lockett & Goodwin, ). Moreover, initial conditions in terms of forest canopy cover (i.e.…”

Section: Introductionmentioning

confidence: 99%

Edaphic factors and initial conditions influence successional trajectories of early regenerating tropical dry forests

et al. 2019

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1. Edaphic factors and initial conditions can regulate the speed of forest succession.Edaphic factors, which include soil chemistry and topography, determine soil resource availability and can filter species as forests mature. Initial plant cover early in succession can determine the rates at which secondary forests change in structure, richness, biomass and composition over time. While some of the effects of edaphic factors and initial conditions on forest succession have been studied, how they simultaneously modify young regenerating tropical forest has rarely been examined.2. We surveyed 22 young forests plots in Panama for 7 years (11, 6 and 3-yearold stands when censuses began). We study how tree and liana species composition change early in succession, as well as how edaphic factors (soil nutrients and topography) and initial conditions (initial basal area and forest canopy cover) influence changes in tree and liana abundance, species richness, biomass and composition throughout succession.3. We found that edaphic factors and initial conditions explained up to 45% of the variation in the successional trajectories for trees and lianas. Soil nutrients had a significant positive effect on the changes in tree biomass accretion, while topography significantly contributed to community similarity of large lianas over time. Initial basal area had a significant negative effect on the changes in sapling abundance and tree richness over time and a positive marginal effect on tree biomass accretion. Forest canopy cover only had a positive marginal effect on changes in sapling abundance.4. Tree abundance, biomass and richness increased over time, while sapling abundance, biomass and richness remained stable or decreased, probably due to community thinning. However, changes over time of small and large lianas diverged, probably due to differential resource availability that affected lianas but not trees. 5.Synthesis. Soil fertility, topography and initial basal area influence early forest regeneration. Higher soil fertility can allow trees to fix carbon faster, and lianas might | 161Journal of Ecology ESTRADA-VILLEGAS ET AL.

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Section: Introductionmentioning

confidence: 99%

Edaphic factors and initial conditions influence successional trajectories of early regenerating tropical dry forests

et al. 2019

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“…The range of heterogeneity factors of l-21 (Table 5) is higher than that reported in the few stand map studies in eucalypt forests. Results from stand maps in artificially-sown mixed-species eucalypt forest in Tasmania had heterogeneity factors of l-14 (Lockett and Goodwin 1999). Hamilton (1984) showed that artificially sown E. regnans-E. delegatensis regeneration in the Central Highlands of Victoria had heterogeneity factors in the range of l-8 (calculated from Hamilton's data).…”

Section: All Species a Species Bmentioning

confidence: 96%

“…At the start of the project the only examples in Australian native forests were those from a 1-y-old dry mixed-species eucalypt forest in Tasmania (Lockett and Goodwin 1999), and some 4-y-old Eucalyptus regnans-E. delegatensis stands in the Central Highlands of Victoria (Hamilton 1984). Thus there was a need to prepare, for regeneration assessment, stand maps of seedling distribution over the range of forest types and silvicultural systems.…”

Section: Introductionmentioning

confidence: 99%

Spatial distribution of regeneration in mixed-species forests of Victoria

Lutze¹,

Ades

Campbell

2004

Australian Forestry

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A study was carried out to describe the variation in the spatial distribution of regeneration in mixed-species forests of Victoria and examine its causes, as a basis for testing measures of regeneration success. Seedbed characteristics, stand history and spatial statistics based on quadrat counts and nearest-neighbour distances were determined for both intensively mapped stands and sparsely sampled coupes at case study sites. It was found that spatial distribution in stands established by clearfelling and artificial sowing, and by retention of seedtrees or shelterwood, were random to very aggregated.Seedbed characteristics were the dominant factor contributing to seedling aggregation in high-elevation mixed-species forest. In low-elevation mixed-species forest the seedbed had an effect on aggregation, but the variation in seed supply also had a large influence on aggregation. Aggregation of regeneration within lowelevation mixed-species forest was not affected consistently by dominance class of the seedlings or the age of regeneration, but was affected by the source of regeneration (seedling or coppice). Aggregation of seedlings decreased or increased marginally with age in high-elevation mixed-species forest. There was variation in the degree of aggregation of different species in mixed-species stands, but there was a tendency for different species to occur together. It is recommended that further development of measures of regeneration success include a simulation study that tests measures with some proven performance in aggregated regeneration, and that the study should be on simulated stands that cover more than the full range of variation observed in the case study sites.

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“…Modelling of stand development past the stage for which reliable stand data is available indicates that the current standards should produce acceptable timber production outcomes (Lockett and Goodwin 1998;Hamilton 1989), but those analyses do not take into account the effect of initial spatial pattern on tree form.…”

Section: Stocking By Quadrat (Fraction (%) Of 4 M 2 and 16 M 2 Plots mentioning

confidence: 99%

“…The resulting spatial variation in density is likely to have an influence on stand yield and self-thinning rate (Opie et a/. 1984;Lockett and Goodwin 1998). While stands may have sufficient seedlings per hectare, there may be areas where seedling density is below that required to maintain site productivity and good tree form.…”

Section: Introductionmentioning

confidence: 98%

Review of measures of site occupancy by regeneration

Lutze¹,

Ades

Campbell

2004

Australian Forestry

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This project investigated the potential to develop an indicator for national reporting of regeneration success. Systems of measuring site occupancy, including performance measures and sustainability evaluation, are reviewed to identify those worth further testing.Current site occupancy measures are based on spatial statistics, frequency and/or intensity, and incorporate an evaluation of whether site resources are being fully utilised by the regeneration. The scientific basis of current measures can be improved by establishing the relationship between initial spatial distribution of regeneration and long-term wood production, including wood quality outcomes. Those measures based on both frequency and intensity are likely to be more sensitive, but more costly.Recommendations are made for further actions to progress development of the national indicator of regeneration success.The key recommendations are to model the spatial pattern of regeneration and simulate the application of alternative measures of site occupancy to the modelled distributions.

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Effects of initial stocking on stand development in even-aged mixed eucalypt regrowth: a preliminary model

Cited by 7 publications

References 2 publications

Edaphic factors and initial conditions influence successional trajectories of early regenerating tropical dry forests

Edaphic factors and initial conditions influence successional trajectories of early regenerating tropical dry forests

Spatial distribution of regeneration in mixed-species forests of Victoria

Review of measures of site occupancy by regeneration

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