Red Alder-Conifer Stands in Alaska: An Example of Mixed Species Management to Enhance Structural and Biological Complexity

Deal, Robert L.; Orlikowska, Ewa H.; D’Amore, D. V.; Hennon, Paul E.

doi:10.3390/f8040131

Cited by 14 publications

(5 citation statements)

References 94 publications

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“…Our alder-Douglas fir results confirm findings in Deal et al (2017) which showed the inclusion of an N-fixing species with a non-N-fixing species can result in overyielding. This effect was associated with differences in some key functional attributes associated with nutrient cycling as observed in the increased abundance of nirK, niS, amoA AOA and AOB genetic markers in the alder rhizosphere soils.…”

Section: Implications For Tree Species Mixturessupporting

confidence: 89%

Roots and rhizospheric soil microbial community responses to tree species mixtures

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Toro

Smith

et al. 2022

Applied Soil Ecology

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Section: Implications For Tree Species Mixturessupporting

confidence: 89%

Roots and rhizospheric soil microbial community responses to tree species mixtures

Ribbons

Toro

Smith

et al. 2022

Applied Soil Ecology

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“…Growth models, together with stand regeneration, harvesting, and mortality models, are important tools in long-term forest management systems (Andreassen and Tomter 2003). Modeling mono-specific stands has a long history, but modeling mixedspecies forests has received much more attention in the last decades (Porté and Bartelink 2002), due to a worldwide trend in managing such forests to improve the biodiversity and environmental services and to assure long-term sustainable forest resources (Deal et al 2017;del Río et al 2016). The structure, dynamics, and productivity of mixed-species stands depend on both interspecific and intraspecific interactions.…”

Section: Introductionmentioning

confidence: 99%

Considering neighborhood effects improves individual dbh growth models for natural mixed-species forests in Mexico

Quiñonez-Barraza

Zhao

Posadas

et al. 2018

Annals of Forest Science

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& Key message More accurate diameter at breast height (dbh)-growth models are needed for developing management tools for mixed-species forests in Mexico. Individual distance-dependent dbh growth models that quantify local neighborhood effects have been developed for four species groups in such forests. The performance of the models is improved by distinguishing between inter-and intraspecific group competitions. & Context The management of mixed-species forests in the northwest of Durango, Mexico, is mainly based on the selection method. Understanding the interspecific and intraspecific competition is critical to developing management tools for such mixed-species forests. & Aims An individual-based distance-dependent modeling approach was used to model the growth of dbh and to evaluate neighborhood effects for four species groups in Mexican mixed-species stands. & Methods Twenty-two species were classified into four groups: Pinus (seven species), other conifers (three species), other broadleaves (four species), and Quercus (eight species). Four methods were used to select neighboring trees and 12 competition indices (CIs) were calculated. Comparisons of the neighboring trees selection methods and CIs and tests of assumptions about neighborhood effects were conducted. & Results Intra-species-group competition significantly reduced diameter growth for all species groups, except for the Quercus group. The Pinus, other conifers, and Quercus groups had significant and negative neighborhood effects on the other broadleaves species group, and not vice versa. The Quercus group also had negative neighborhood effect on the Pinus and other conifers species groups, and not vice versa. The Pinus and other conifers species groups had negative neighborhood effects on each other. All fitted age-independent dbh growth models showed a good of fit to the data (adjusted coefficient of determination larger than 0.977). & Conclusion The growth models can be used to predict dbh growth for species groups and competition in mixed-species stand from Durango, Mexico.

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“…Crop tree release is another practice that enhances individual tree productivity by reducing competition for selected trees via the removal of crowns from nearby trees, and both hemlock and spruce respond to release under alder (Deal and Tappeiner ; Deal et al. ). This could be used in harvested riparian zones to promote large conifers that are suitable for future large wood.…”

Section: Discussionmentioning

confidence: 99%

Effects of Riparian Timber Harvest on Southeast Alaska Stream Habitat after 30–40 Years: Insights for Management

Ross

Infante

Martin³

et al. 2019

N American J Fish Manag

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Logging regulations in the Pacific Northwest and Alaska have evolved over time to alleviate the negative effects that historic harvest practices have had on stream habitat. While natural landscape factors largely control stream habitat, timber harvest can alter these influences, underscoring the importance of clarifying the effects of both for understanding and managing habitat in streams. We sampled areas in Southeast Alaska that had riparian zones harvested between 1980 and 1990, a period of less-restrictive timber harvest regulations. Relationships between geomorphic and riparian factors with stream habitat informed a comparison of habitat under differing timber management strategies 30-40 years after harvest. Pool, substrate, and large wood characteristics were related to stream size, channel gradient, and channel confinement, whereas wood-formed pools and large wood density were related to riparian factors. Pool characteristics in streams with harvested riparian zones were similar to those in streams with unharvested riparian zones. Large wood size distributions in streams with harvested riparian zones were also similar to those in streams with unharvested riparian zones and streams within forests managed for timber under contemporary regulations. These findings are likely due to legacy wood loads remaining and functioning to create habitat 30-40 years after harvest. Substrate size was related to timber management practices; streams with harvested riparian zones had smaller median particle sizes than unharvested streams. Wood loads remain and function instream decades after harvest, but the reduced supply of large-sized wood from young-growth riparian stands can result in declining habitat quality, especially in unconfined channels. Management strategies to enhance recovery of riparian stands with trees large enough to supply large-sized wood are recommended. Our approach proved useful in teasing out legacy effects of past timber harvest from the effects of natural drivers on stream habitat, and the results can be used to help prioritize efforts aimed at conserving or restoring stream and riparian habitats in the region.

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Red Alder-Conifer Stands in Alaska: An Example of Mixed Species Management to Enhance Structural and Biological Complexity

Cited by 14 publications

References 94 publications

Roots and rhizospheric soil microbial community responses to tree species mixtures

Roots and rhizospheric soil microbial community responses to tree species mixtures

Considering neighborhood effects improves individual dbh growth models for natural mixed-species forests in Mexico

Effects of Riparian Timber Harvest on Southeast Alaska Stream Habitat after 30–40 Years: Insights for Management

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