Slow recovery of bryophyte assemblages in middle-aged boreal forests regrown after clear-cutting

Dynesius, Mats

doi:10.1016/j.biocon.2015.06.024

Cited by 18 publications

(11 citation statements)

References 34 publications

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“…This suggests that management of these local factors will impact all substrate communities. However, previous studies have shown that recovery rates of communities following disturbance differ between substrates (Dynesius, ), so while we suggest that management techniques that alter important environmental variables will have beneficial impacts across substrates, it is likely that some management of individual substrates will still be required, e.g. protection of CWD.…”

Section: Discussionmentioning

confidence: 68%

Distance, environmental and substrate factors impacting recovery of bryophyte communities after harvesting

Baker

Jordan

Fountain‐Jones

et al. 2017

Applied Vegetation Science

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Aims: Bryophyte re-colonization after disturbance is largely governed by environmental conditions within disturbed forests. In particular, distance to a forest edge is an important predictor of bryophyte community re-colonization, through either direct constraints, such as dispersal limitation, or indirectly by altering environmental conditions. This study examines a range of factors -environmental, distance to an edge, substrate specific environment or local-level environment -to determine which are important in the re-colonization of bryophyte communities after forest harvesting. As bryophyte communities vary with the particular substrate inhabited, responses were examined across four substrates (rock, exposed roots, ground and CWD). Location: Tasmanian southern forests, Australia.Methods: Bryophyte composition was examined on four substrates (ground, coarse wood debris, exposed roots, rocks) within three ages (~7, ~27 and ~45 years postdisturbance) of harvested wet eucalypt forest. Re-colonization success of bryophyte communities was determined by comparing communities in regeneration forest to mature forest communities using axis scores from one-dimensional constrained ordination.The importance of various environmental conditions for re-colonization success was then modelled. Finally, path analysis was used to determine whether the impact of distance to a forest edge was meditated through its effects on key environmental variables. Results:Multiple environmental factors impacted re-colonization of mature bryophyte communities. Local-level conditions such as microclimate (temperature, humidity and VPD) and LAI were the most important in determining re-colonization across substrates. Path analysis showed that distance to a forest edge had a significant impact on re-colonization success, but only a relatively small part of this was mediated through its impact on environmental factors. Conclusions:Bryophyte re-colonization is driven by a combination of microclimate conditions and factors related to distance from a forest edge (most likely dispersal distance). While some substrate-specific factors impact bryophyte re-colonization success, the consistent impact of local environmental factors across substrates suggests that harvesting management strategies that develop more 'mature' microclimate conditions and increase proximity to nearby mature forest patches will be beneficial Nomenclature: Online catalogue of Australian mosses (AusMoss) for mosses; Checklist of Australian Liverworts and Hornworts (http://www.anbg.gov.au) | 65

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Section: Discussionmentioning

confidence: 68%

Distance, environmental and substrate factors impacting recovery of bryophyte communities after harvesting

Baker

Jordan

Fountain‐Jones

et al. 2017

Applied Vegetation Science

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“…Thus, harvesting approaches that retain some canopy cover may be an effective way to promote bryophyte and lichen survival across a managed landscape. In comparison to clear-cut forest stands, Dynesius [53] could not find support for bryophyte assemblages approaching those in uncut forests after 15 years. Our treatment plots maintained a similar set of species assemblages, and support recommendations by Fenton et al [54] that maintained that some canopy cover could reduce the impacts of forest harvesting on understory species in pine-moss-lichen forests.…”

Section: Implications For Ground Layer Recovery After Canopy Openingmentioning

confidence: 62%

Terrestrial Bryophyte and Lichen Responses to Canopy Opening in Pine-Moss-Lichen Forests

Vitt

Finnegan²,

House

2019

Forests

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Pinus contorta-dominated montane forests of western Canada with relatively dense tree canopies have ground layers with abundant bryophytes, especially the feather mosses (Pleurozium schreberi and Hylocomium splendens), while those with more open canopies are dominated by species of reindeer lichens, especially Cladonia arbuscula s.l. and C. rangiferina s.l. Woodland caribou (Rangifer tarandus caribou), which are a threatened species in Alberta, prefer open, Cladonia-dominated forests for their winter food supply. This study investigated if opening the canopy by thinning mature montane forests of the Canadian Rocky Mountain foothills would change the abundance of lichens and bryophytes. In 1997, forests were thinned by removing 20%, 40%, and 60% by volume. In 2016, 19 years after treatment, we re-surveyed a subset of these plots (n = 97) for lichen and bryophyte abundance and species richness by utilizing the amount of canopy opening at the plot level as our prime gradient. We then used ordination to determine the relationship of control plots to treatment plots. In uncut forest, the control plots were highly variable, but were mostly dominated by feather mosses, with little or no bare ground. Feather moss abundance was lower in treatment plots when compared to control plots, while cover of bare ground was greater. Overall, 19 years after treatment, we found that, in treatment plots, lichen abundance remained stable or slightly increased, feather mosses decreased markedly, and unoccupied space was double that of the control plots. We conclude that the canopy opening had little effect on understory and ground layer diversity, but considering species abundance (1) bryophytes have not recovered after canopy opening, (2) populations of reindeer lichens increased marginally, but have not colonized areas left bare from bryophyte dieback, and (3), after 19 years there, remains unoccupied areas of bare ground in plots with a reduced canopy cover. Our study demonstrated that, with canopy cover reduction resulting from forest thinning operations, the ground layer diversity is maintained, but recovery of ground layers in old-growth pine-dominated forests is not promoted. Therefore, timber harvest that partially opens the tree canopy is unlikely to benefit caribou by augmenting or accelerating winter food availability and habitat suitability for caribou.

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“…En cada parcela se evaluó el diámetro de la base del árbol, para lo cual se utilizó un vernier electrónico marca VINCA de 15 cm de longitud y la altura se evaluó con una vara telescópica marca Forestry de 8 m de altura máxima. También se evaluó el tipo de rebrote, para lo cual se utilizó la clasificación que define tres tipos de rebrote [12]: 1. Adventicias: son tejidos formados en callos de cicatrización, generados en el proceso de cicatrización del tocón, y su sistema vascular no proviene directamente del haz del tronco (figura 12a).…”

Section: Variables Analizadasunclassified

“…Con respecto al tipo de rebrote (cuadro 1), se encontró que el rebrote más común fue del tipo epicórmico, con una presencia promedio del 94,20 %, seguido por el tipo adventicio y el lignofiber, este último únicamente se presentó en la época seca para la densidad de siembra de 4445 árb ha -1 . El dominio de rebrote epicórmico se debe a que es un rebrote de rápido desarrollo, con presencia de meristemos secundarios y en los que el consumo energético es menor en comparación al adventicio o lignofiber que son rebrotes de lento desarrollo y de un consumo energético mayor [15], además el rebrote epicórmico es según Dynesium et al [12] el más común del género Leucaena sp en regiones tropicales, por lo que indiferentemente de la densidad de siembra, la especie tendería a la generación de dicho tipo de rebrote.…”

Section: Efectos De La éPoca De Poda En La Mortalidad Y Tipo De Rebrotesunclassified

“…El crecimiento mayor de diámetro y altura en época lluviosa se debió a que es el momento en que el árbol cuenta con mayor cantidad de agua en el suelo y nutrientes disponibles [12], en el caso de la época seca la disponibilidad de agua en la planta genera que el individuo desarrolle medidas de control hídrico, reduciendo el crecimiento primario y secundario y centrando las actividades metabólicas en sobrevivir al déficit [16]. Por lo que el desarrollo de actividades de poda en época lluviosa (indistintamente la densidad de la plantación o altura de la poda) generó mayor crecimiento, y se obtuvieron tendencias similares a las presentados por Nassar et al [14] para especies del género Leucaena sp.…”

Section: Efectos De La éPoca De Poda En La Mortalidad Y Tipo De Rebrotesunclassified

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Capacidad de rebrote de Leucaena macrophylla Benth con fines dendroenergéticos en Cortes, Honduras

Flores-Pinot

Janeth-Sorto

Gutiérrez-Bardales

et al. 2018

RFMK

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Se evaluó el efecto de la época de corta, altura de corta y densidad de siembra en el manejo de rebrotes de árboles de Leucaena macrophylla Beneth, para lo cual se utilizó una plantación experimental en Cortés, Honduras. El cultivo forestal se evaluó a una edad de un año y se establecieron tres densidades de siembra (2500, 4445 y 10000 árb ha-1), dentro del diseño se aplicaron tres tratamientos de poda (testigo, 40 y 100 cm de altura de tocón), los cuales fueron aplicados en la época seca (marzo 2016) y lluviosa (julio 2017). Posterior a la corta del rebrote, se evaluó la mortalidad, tipo de rebrote, crecimiento diamétrico y la altura del rebrote transcurrido un año. Los datos revelaron que no hay diferencia en la tasa de mortalidad de rebrotes en función de la época de poda (promedio del 57,34 %), además que indiferentemente del espaciamiento y altura de poda, el rebrote de tipo epicórmico fue el que presentó mayor presencia. Con respecto al crecimiento diamétrico se registraron variaciones entre 1,2 a 4,3 cm y la variaciones en altura de 0,5 a 5,8 m; además se encontró una tasa de crecimiento mayor en la época lluviosa (del 15 a 35 % más que la época seca). No se encontraron diferencias entre la poda a 40 y 100 cm y finalmente se determinó que una densidad de 1000 árb ha-1 incidió negativamente en el crecimiento de la plantación y generó disminuciones de crecimiento hasta del 20 % con respecto a las densidades de 4445 y 2500 árb ha-1 , que no mostraron diferencias entre sí.

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Slow recovery of bryophyte assemblages in middle-aged boreal forests regrown after clear-cutting

Cited by 18 publications

References 34 publications

Distance, environmental and substrate factors impacting recovery of bryophyte communities after harvesting

Distance, environmental and substrate factors impacting recovery of bryophyte communities after harvesting

Terrestrial Bryophyte and Lichen Responses to Canopy Opening in Pine-Moss-Lichen Forests

Capacidad de rebrote de Leucaena macrophylla Benth con fines dendroenergéticos en Cortes, Honduras

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