Grassland productivity and diversity on a tree cover gradient in Nothofagus pumilio in NW Patagonia

Sánchez-Jardón, Laura; Acosta, Belen O.; Pozo, Alejandro del; Ovalle, Carlos; Elizalde, HF; Hepp, Crystal M.; Miguel, Jesús M. de

doi:10.1016/j.agee.2010.02.006

Cited by 33 publications

(11 citation statements)

References 32 publications

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“…Impact on the understory Total richness species recorded in this study (61 sp.) was higher than that found in other sites in N. pumilio forests (Sánchez-Jardón et al 2010;Lencinas et al 2008;Damascos and Rapoport 2002), and did not vary with distance. Shannon-Wiener's diversity index did not vary with distance, but showed a higher value at 320 m to flood meadows, where native plants dominate the understory.…”

Section: Discussioncontrasting

confidence: 72%

“…In areas near flood meadows (10-20 m), where there was higher livestock use impact, a high cover of herbaceous species was recorded. These were mainly the exotic herbaceous species P. pratensis, S. media, T. repens, T. officinale and R. acetosella, and some native ones such as B. coloratus, A. pinnatifida and P. chilensis, cited for N. pumilio forests with presence of livestock (Sánchez-Jardón et al 2010). In contrast, in areas far from flood meadows (320 m), higher cover of native herbaceous species such as P. alopecurus, O. chilensis, A. chilense, C. crenatifolia, L. thermarum, S. chilensis, B. penna-marina, and native shrubs such as G. mucronata, R. cucullatum, B. serrato-dentata were recorded, while no exotic species were present.…”

Section: Discussionmentioning

confidence: 99%

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Distance to flood meadows as a predictor of use of Nothofagus pumilio forest by livestock and resulting impact, in Patagonia, Argentina

et al. 2011

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Seedling browsing by livestock has been indicated as major threat for forest sustainability use. Nothofagus pumilio forests are part of the livestock raising system in Patagonia, but because of the sparse understory cover, livestock graze mainly on flood meadows within the forest matrix. The complexity of the environment under study (forests and flood meadows) means that an adaptive predictor is needed to evaluate the intensity of resource use by livestock in order to assess its effect on the forest. Distance to flood meadows was evaluated as a predictor of the use intensity of the forest by livestock and its effect on the understory. The study was conducted at three sites in Chubut Province, Patagonia-Argentina. We established transects in the forest 320 m long, starting at the edge flood meadow-forest. In these transects, the livestock presence indicators (soil compaction, density of feces and trails) and composition of the understory were evaluated. Generalized Linear Model for repeated measures for longitudinal data were used. The indicators showed that distance is efficient for estimating forest use intensity by livestock. The understory varied with distance, the cover of exotic herbaceous was higher near the flood meadow. Far from the flood meadow, the cover was entirely composited of native species. The results support the use of distance to flood meadows as a tool for decision making in livestock and forest management in N. pumilio forests, and for further research on livestock effect on the forest.

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Section: Discussioncontrasting

confidence: 72%

Section: Discussionmentioning

confidence: 99%

Distance to flood meadows as a predictor of use of Nothofagus pumilio forest by livestock and resulting impact, in Patagonia, Argentina

et al. 2011

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“…As happened in the present study, the increase in CP content under shading conditions also has been reported for different pasture species such as Festuca arundinacea Schreb (Burner and Brauer, 2003), Festuca ovina, D. glomerata, T. repens and Trifolium pratense L. (Parissi and Koukoura, 2009) and Taraxacum officinale (Sánchez-Jardón et al, 2010). The longer leaves, larger leaf area, greater CCI found under HSh allowed L. perenne and A. capillaris to maximize light capture and provide evidence of their shade tolerance, especially when soil nutrients are not limiting plant growth.…”

Section: Figuresupporting

confidence: 88%

Ajustes morfo-fisiológicos de Lolium perenne L. y Agrostis capillaris L. como respuesta a la disminución de la luz incidente

Flores¹,

López²,

Kemp³

et al. 2018

agrosur

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“…In similar lenga forests but having evidence of grazing disturbance, Quinteros et al (2012) registered higher richness (ϳ19%) and cover of exotic species in the understory than in this study. Similar results with regard to increases in exotic species were recorded in cattle-grazed lenga forest of the nearby Aysén region in the western Andean slopes of Chile (Sánchez-Jardón et al 2010). In the southern area of lenga distribution, an important increase in frequency and cover of exotic species was registered in forests during the first 6 years after the shelterwood-cut intervention (Fernández et al 1998).…”

Section: Variations In the Attributes Of Understory Plant Communitysupporting

confidence: 79%

Characterization of Nothofagus pumilio (Lenga) Understory in Managed and Unmanaged Forests of Central Patagonia, Argentina

Silva¹,

Quinteros²,

Greslebin³

et al. 2017

Forest Science

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In managed forests, biodiversity conservation is crucial for the sustainable use of ecosystem resources. In the Patagonian-Andes forests of Argentina, lenga (Nothofagus pumilio) is the most important native tree because of its ecological functions and economic importance as a timber provider. In this study, we determined how the shelterwood-cut system impacts understory vegetation attributes in three sites representing typical lenga forests of central Andean-Patagonia. In each site, two 250-m 2 treatment plots (managed and unmanaged) were established, and canopy cover, soil temperature, and moisture were determined. Within plots in 10 randomly placed 0.25-m 2 microplots, we determined plant cover, from which we calculated diversity attributes. Canopy cover and soil moisture were higher in unmanaged treatments, whereas the reverse was true for soil temperature. The Shannon-Wiener index showed similar values (ϳ1), whereas species richness was slightly higher in unmanaged (4.8 Ϯ 0.5) than in managed treatments (3.8 Ϯ 0.3). Generally, native plants dominated the understory (ϳ40%), whereas exotic species were rare (ϳ1%). Shrub cover was higher in managed (24.1 Ϯ 4.2) than in unmanaged (9.5 Ϯ 1.7) treatments, whereas herbaceous species dominated unmanaged forests. These results confirm that the shelterwood-cut system may be used for diversity conservation in Patagonian lenga forests.

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Grassland productivity and diversity on a tree cover gradient in Nothofagus pumilio in NW Patagonia

Cited by 33 publications

References 32 publications

Distance to flood meadows as a predictor of use of Nothofagus pumilio forest by livestock and resulting impact, in Patagonia, Argentina

Distance to flood meadows as a predictor of use of Nothofagus pumilio forest by livestock and resulting impact, in Patagonia, Argentina

Ajustes morfo-fisiológicos de Lolium perenne L. y Agrostis capillaris L. como respuesta a la disminución de la luz incidente

Characterization of Nothofagus pumilio (Lenga) Understory in Managed and Unmanaged Forests of Central Patagonia, Argentina

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