Advances in Silviculture of Intensively Managed Plantations

Rubilar, Rafael; Allen, H. Lee; Fox, Thomas R.; Cook, Rachel L.; Albaugh, Timothy J.; Campoe, Otávio Camargo

doi:10.1007/s40725-018-0072-9

Cited by 47 publications

(24 citation statements)

References 113 publications

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“…By contrast, trees initially planted at high densities may experience less competition from shrubs and grasses as crowns interlock early and reduce light to the understory (Rubilar et al, 2018). As trees mature, however, intertree competition reduces growth rates and increases the probability of density-dependent mortality.…”

Section: Current Reforestation Practicesmentioning

confidence: 99%

Tamm Review: Reforestation for resilience in dry western U.S. forests

North

Stevens

Greene

et al. 2019

Forest Ecology and Management

131

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Section: Current Reforestation Practicesmentioning

confidence: 99%

Tamm Review: Reforestation for resilience in dry western U.S. forests

North

Stevens

Greene

et al. 2019

Forest Ecology and Management

131

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“…Study of biomass production, nutrient removal during logging operations and management of logging residues is essential to prevent negative effects on sustainable productivity and soil fertility in this management system (Gonçalves et al 2013;Rubilar et al 2018). Unlike the previous type of management, several commercial forestry operations leave different biomass compartments as logging residues in this case (Achat et al 2015).…”

Section: Conventional Pulp Plantationsmentioning

confidence: 99%

Exploring the factors affecting carbon and nutrient concentrations in tree biomass components in natural forests, forest plantations and short rotation forestry

et al. 2018

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Background: Coupling biomass models with nutrient concentrations can provide sound estimations of carbon and nutrient contents, enabling the improvement of carbon and nutrient balance in forest ecosystems. Although nutrient concentrations are often assumed to be constant for some species and specific tree components, at least in mature stands, the concentrations usually vary with age, site index and even with tree density. The main objective of this study was to evaluate the sources of variation in nutrient concentrations in biomass compartments usually removed during harvesting operations, covering a range of species and management conditions: semi-natural forest, conventional forest plantations and short rotation forestry (SRF). Five species (Betula pubescens, Quercus robur, Eucalyptus globulus, Eucalyptus nitens and Populus spp.) and 14 genotypes were considered. A total of 430 trees were sampled in 61 plots to obtain 6 biomass components: leaves, twigs, thin branches, thick branches, bark and wood. Aboveground leafless biomass was pooled together for poplar. The concentrations of C, N, K, P, Ca, Mg, S, Fe, Mn, Cu, Zn and B were measured and the total biomass of each sampled tree and plot were determined. The data were analysed using boosted regression trees and conventional techniques. Results:The main sources of variation in nutrient concentrations were biomass component > > genotype (species) ≈ age > tree diameter. The concentrations of Ca, Mg and K were most strongly affected by genotype and age. The concentrations of P, K, Ca, Mg, S and Cu in the wood component decreased with age, whereas C concentrations increased, with a trend to reach 50% in the older trees. In the SRF, interamerican poplar and P. trichocarpa genotypes were comparatively more efficient in terms of Ca and K nutrient assimilation index (NAI) (+ 65-85%) than eucalypts, mainly because leafless biomass can be removed. In the conventional eucalypt plantations (rotation 15 years), debarking the wood at logging (savings of 225% of Ca and 254% of Mg for E. globulus) or the use of selected genotypes (savings of 45% of P and 35% of Ca) will provide wood at a relatively lower nutrient cost. Considering all the E. globulus genotypes together, the management for pulp with removal of debarked wood shows NAI values well above (× 1.7-× 3.9) the ones found for poplar or eucalypt SRF and also higher (× 1.6-× 4.0) than the ones found for oak and birch managed in medium or long rotations. The annual rates of nutrient removal were low in the native broadleaved species but the rates of available soil nutrients removed were high as compared to poplar or eucalypts. Management of native broadleaved species should consider nutrient stability through selection of the biomass compartments removed.

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“…Leaf area index (LAI) is widely used in silvicultural decision support [1,2]. Careful silvicultural manipulation of LAI can reduce drought stress [3], and can be used to assess site preparation outcomes, including the proportion of stand LAI post-establishment that is from competing herbaceous and arborescent species [4].…”

Section: Introductionmentioning

confidence: 99%

Landsat 8 Based Leaf Area Index Estimation in Loblolly Pine Plantations

Blinn

House

Wynne

et al. 2019

Forests

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Leaf area index (LAI) is an important biophysical parameter used to monitor, model, and manage loblolly pine plantations across the southeastern United States. Landsat provides forest scientists and managers the ability to obtain accurate and timely LAI estimates. The objective of this study was to investigate the relationship between loblolly pine LAI measured in situ (at both leaf area minimum and maximum through two growing seasons at two geographically disparate study areas) and vegetation indices calculated using data from Landsat 7 (ETM+) and Landsat 8 (OLI). Sub-objectives included examination of the impact of georegistration accuracy, comparison of top-of-atmosphere and surface reflectance, development of a new empirical model for the species and region, and comparison of the new empirical model with the current operational standard. Permanent plots for the collection of ground LAI measurements were established at two locations near Appomattox, Virginia and Tuscaloosa, Alabama in 2013 and 2014, respectively. Each plot is thirty by thirty meters in size and is located at least thirty meters from a stand boundary. Plot LAI measurements were collected twice a year using the LI-COR LAI-2200 Plant Canopy Analyzer. Ground measurements were used as dependent variables in ordinary least squares regressions with ETM+ and OLI-derived vegetation indices. We conclude that accurately-located ground LAI estimates at minimum and maximum LAI in loblolly pine stands can be combined and modeled with Landsat-derived vegetation indices using surface reflectance, particularly simple ratio (SR) and normalized difference moisture index (NDMI), across sites and sensors. The best resulting model (LAI = −0.00212 + 0.3329SR) appears not to saturate through an LAI of 5 and is an improvement over the current operational standard for loblolly pine monitoring, modeling, and management in this ecologically and economically important region.

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Advances in Silviculture of Intensively Managed Plantations

Cited by 47 publications

References 113 publications

Tamm Review: Reforestation for resilience in dry western U.S. forests

Tamm Review: Reforestation for resilience in dry western U.S. forests

Exploring the factors affecting carbon and nutrient concentrations in tree biomass components in natural forests, forest plantations and short rotation forestry

Landsat 8 Based Leaf Area Index Estimation in Loblolly Pine Plantations

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