Alternative silvicultural practices with variable retention to improve understory plant diversity conservation in southern Patagonian forests

Lencinas, María Vanessa; Pastur, Guillermo Martínez; Gallo, Emilce; Cellini, Juan Manuel

doi:10.1016/j.foreco.2011.06.021

Cited by 80 publications

(99 citation statements)

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“…Also, removal of retained overstory during final cuts under shelterwood system could increase changes in microclimate, and then accelerate sensitive species extirpation. An indicator of gradual loss could be the decreasing in relative abundance of species (e.g., Uncinia lechleriana) or groups (mosses and ferns), both showed as sensitive entities in other studies too (Lencinas et al, 2008b(Lencinas et al, , 2011. Increasing in moss cover in RH-L (when general trend is to diminish with harvesting) could be explained by quickly establishment of bryophyte early-succesional species, similarly to the observed by Ruokolainen and Salo (2006) in Finnish forest.…”

Section: Discussionmentioning

confidence: 90%

“…The introduction of species occurs from associated environments (grasslands, peat-lands and Nothofagus antarctica (Forster f.) Oersted forests, as was described by Lencinas et al, 2008a), and then they remain in the system along the complete forest cycle (Martínez Pastur et al, 2002). Ecological modifications can favor native and exotic understory plant species, previously present in primary forest or not, which improves growth and could produce more than two fold greater cover in open forests compared to closed stands (Lencinas et al, 2011). Some exotic species (A. stolonifera, C. fontanum, P. pratensis, R. acetosella and V. serpyllifolia) are naturalized and grow freely in both disturbed and undisturbed communities (Moore, 1983), due to their ability to disperse and acclimatize.…”

Section: Discussionmentioning

confidence: 99%

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Site quality influence over understory plant diversity in old-growth and harvested Nothofagus pumilio forests

2013

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Aim of study: The effects and interactions of shelterwood forest harvesting and site qualities over understory plant species diversity and composition were compared among primary and harvested Nothofagus pumilio forests.Area of study: Tierra del Fuego (Argentina), on three pure conditions (one and six year-old harvested, and primary without previous harvesting forests) and three site qualities (high, medium and low).Material and Methods: Understory richness and cover (%) were registered in five replicates of 1 hectare each per treatment. Taxonomic species were classified in categories (groups, origin and life forms). Two-way ANOVAs and multivariate analyses were conducted.Main results: Shelterwood harvesting and site quality significantly influenced understory cover and richness, which allow the introduction of native and exotic species and increasing of dicot and monocot covers. In dicots, monocots, exotics and total groups, higher richness and covers were related to time. Meanwhile, cover reached similar high values in all site qualities on dicot, native and total groups. On the other hand, monocot and exotic richness and cover remain similar in primary and recently harvested forests, and greatly increased in old harvested forests. Mosses and ferns were among the most sensitive groups.Research highlights: Impacts of shelterwood cut depend on site quality of the stands and time since harvesting occurs. For this, different site quality stands should received differential attention in the development of conservation strategies, as well as variations in the shelterwood implementation (as irregularity and patchiness) should be considered to better promote understory plant species conservation inside managed areas.Key words: plant species conservation; years after harvesting; forest management; Tierra del Fuego.

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Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Site quality influence over understory plant diversity in old-growth and harvested Nothofagus pumilio forests

2013

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“…Contrary, in the southernmost island conditions, understory composition and structure of mixed deciduous-evergreen Nothofagus forests have been little explored (Promis et al 2008) compared to pure Nothofagus forests. Many researches in N. pumilio were developed studying natural unmanaged and several anthropogenic impacted forests (e.g., Martínez Pastur et al 2002;Lencinas et al 2008aLencinas et al , 2008bLencinas et al , 2011, but pure N. betuloides forests have received fewer attention. Both pure forest types usually develop a sparse and short understory layer (less than 1 m tall), mainly conformed by herbaceous and moss species (Moore 1983;Matteri and Schiavone 2002).…”

Section: Introductionmentioning

confidence: 99%

The influence of canopy-layer composition on understory plant diversity in southern temperate forests

et al. 2017

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Background: Understory plants represents the largest component of biodiversity in most forest ecosystems and plays a key role in forest functioning. Despite their importance, the influence of overstory-layer composition on understory plant diversity is relatively poorly understood within deciduous-evergreen broadleaved mixed forests. The aim of this work was to evaluate how tree overstory-layer composition influences on understory-layer diversity in three forest types (monospecific deciduous Nothofagus pumilio (Np), monospecific evergreen Nothofagus betuloides (Nb), and mixed N. pumilio-N. betuloides (M) forests), comparing also between two geographical locations (coast and mountain) to estimate differences at landscape level. Results: We recorded 46 plant species: 4 ferns, 12 monocots, and 30 dicots. Canopy-layer composition influences the herb-layer structure and diversity in two different ways: while mixed forests have greater similarity to evergreen forests in the understory structural features, deciduous and mixed were similar in terms of the specific composition of plant assemblage. Deciduous pure stands were the most diverse, meanwhile evergreen stands were least diverse. Lack of exclusive species of mixed forest could represent a transition where evergreen and deciduous communities meet and integrate. Moreover, landscape has a major influence on the structure, diversity and richness of understory vegetation of pure and mixed forests likely associated to the magnitude and frequency of natural disturbances, where mountain forest not only had highest herb-layer diversity but also more exclusive species. Conclusions: Our study suggests that mixed Nothofagus forest supports coexistence of both pure deciduous and pure evergreen understory plant species and different assemblages in coastal and mountain sites. Maintaining the mixture of canopy patch types within mixed stands will be important for conserving the natural patterns of understory plant composition in southern beech mixed forests.

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“…Among the biotic changes, the dynamic of the understory (e.g. Lencinas et al, 2011;Gallo et al, 2013) and the herbivore grazing , are the factors with greater influence; and among the abiotic changes, the climate extreme events could be considered as the most influent (e.g. Curran et al, 1999;Schauber et al, 2002;James, 2011).…”

Section: Seed Production and Recruitmentmentioning

confidence: 99%

Seed production and recruitment in primary and harvested Nothofagus pumilio forests: Influence of regional climate and years after cuttings

et al. 2015

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Aim of study: Harvesting proposals (e.g. variable retention) for Nothofagus pumilio forests are based on canopy opening, to increase recruitment and enhance seedling growth, by modifying light and soil moisture. Seed production and seedling recruitment will define the success of harvesting, where remnant forest structure are the main influence factors, as well as biotic and abiotic factors. The objective was to analyse seed production, seedling recruitment and recruitment efficiency in primary and harvested forests through variable retention along the first 10 years after harvesting, as well as the influence of regional climate.Area of study: The study were conducted in a pure Nothofagus pumilio forest located in centralTierra del Fuego (54º18’ S, 67º49’ W), where harvested stands with variable retention and unmanaged forests were sampled in long-term permanent plots.Material and methods: Data of forest regeneration plots were used (n=72) (2007 a 2014), and forest structure and seed production (2006 a 2013) were also measured. Regional climate was characterised for these years from satellite images (Sea Surface Temperature) and climate re-analysis models (rainfall and temperature of land surface).Main results: Harvesting modified forest structure; however, aggregated retention maintained some characteristics of the primary unmanaged forests. These changes influenced seed production and recruitment. Seed production and recruitment were related to crown cover and the amount of seed production; however, recruitment efficiency was not affected by harvesting. The studied variables significantly changed along the years after harvesting. Seed production and recruitment were also related to regional climate factors, where it was possible to explain their variations through temperature (e.g. summer temperature) and rainfall (e.g. winter rainfall) for the different retention types in harvested forests and the primary forests.Research highlights: Variable retention harvesting generated different micro-conditions that influence seed production and recruitment. These variables were related to canopy cover. However, recruitment efficiency was not affected by harvesting. Seed production and recruitment (primary forests and harvested stands) were related to regional climate factors and their variations can be explained from variables related to temperature and rainfall.Key words: regeneration; forest management; crown cover; regional climate; modelling; Tierra del Fuego.

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Alternative silvicultural practices with variable retention to improve understory plant diversity conservation in southern Patagonian forests

Cited by 80 publications

References 75 publications

Site quality influence over understory plant diversity in old-growth and harvested Nothofagus pumilio forests

Site quality influence over understory plant diversity in old-growth and harvested Nothofagus pumilio forests

The influence of canopy-layer composition on understory plant diversity in southern temperate forests

Seed production and recruitment in primary and harvested Nothofagus pumilio forests: Influence of regional climate and years after cuttings

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