Mantillo de las especies leñosas de matorrales del no de la Patagonia: abundancia, composición, estructura y heterogeneidad

Paz, Manuel de; Gobbi, Miriam E.; Raffaele, Estela

doi:10.31055/1851.2372.v48.n3-4.7607

Cited by 10 publications

(15 citation statements)

References 3 publications

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“…Our results indicate that Acaena cushions exert their facilitator role in volcanic areas characterized by recurrent ash depositions that contribute to the formation of young soils with limited nutrient availability. In light of these conditions of limited soil fertility, the soil within the Acaena cushion microhabitat had a significantly higher OMC, C/N ratio and available soil K concentration (Table ) than the soil in the bare ground microhabitat, variables that appear to be driven by a high annual litter input (de Paz et al., ). Higher soil K availability seems to be a common characteristic of conditions associated with plant benefactors in general (Callaway, ; Gómez‐Aparicio, Gómez, Zamora, & Boettinger, ), and of cushion plants in particular (Cavieres et al., ; Yang et al., ).…”

Section: Discussionmentioning

confidence: 99%

“…To determine if Acaena benefits from the presence of Embothrium (hypothesis 3), we examined the reproductive output of Acaena when growing in association with Embothrium or not. It was not possible to evaluate the survival or growth of Acaena in the period of the study as Acaena losses most of its leaves and shoots annually (de Paz et al., ). The effect of Embothrium on the reproductive output of Acaena was evaluated with two approaches.…”

Section: Methodsmentioning

confidence: 99%

“…persistent strong winds, semiarid conditions) and young poorly developed soils driven by recurrent volcanic ash depositions (Diehl, Mazzarino, & Fontenla, ; Fajardo & Piper, ; Kitzberger, Steinaker, & Veblen, ). These soils likely limit plant establishment as they adsorb P, making it unavailable to plants (Lambers et al., ; Piper et al., ), and sustain a flora generally poor in vascular N‐fixing species (de Paz, Gobbi, & Raffaele, ; Diehl et al., ; Fontenla, Godoy, Rosso, & Havrylenko, ; Fontenla, Puntieri, & Ocampo, ). In addition, soils here are minimally exposed to atmospheric pollution (Dentener et al., ; Perakis & Hedin, ).…”

Section: Introductionmentioning

confidence: 99%

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The association between a nurse cushion plant and a cluster root‐bearing tree species alters the plant community structure

et al. 2019

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Several plant species have the potential to facilitate the presence of other plant species in the community, and yet most of our knowledge on this phenomenon comes from studies considering only one facilitator species. What happens when there are two facilitator species in the community? Are the facilitation effects by one species being altered by the presence of a potentially second facilitator species and vice‐versa (i.e. bidirectional facilitation)? Knowing that cushion plants ameliorate stress and improve soil fertility and that cluster root‐bearing species mobilize soil phosphorus (P), we investigated the potential occurrence of bidirectional facilitation via stress amelioration and nutrient exchange in the cushion plant Acaena integerrima (Rosaceae) and the cluster root‐bearing tree species Embothrium coccineum (Proteaceae). In southern Chile, where both species naturally occur, we compared aspects of the vegetative and reproductive performance of each species growing in association or not. We also determined if Embothrium alters the nurse effects of Acaena cushions on other species by evaluating species richness, frequency, and abundance in cushion plants with and without Embothrium. To infer the existence of nutrient exchange, we determined soil and leaf nutrient levels of both species. Species richness, frequency and abundance were higher within than outside Acaena cushions. Although the presence of Embothrium did not enhance the overall positive effects of Acaena on species composition, nine species occurred more frequently when Embothrium was present. Embothrium occurred more frequently and had a higher survival and leaf nitrogen (N) concentration when growing with Acaena than without it, although its growth and leaf P concentration were lower. In contrast, Acaena had a lower number of and mass of fruits per inflorescence and a higher leaf P concentration when growing with versus growing without Embothrium. Synthesis. The cushion plant Acaena integerrima facilitates the occurrence of many species in the community, including the cluster root‐bearing species Embothrium coccineum, which in turn enhances the facilitation effect of Acaena on certain species. When Embothrium and Acaena occur together, the latter improves its nutritional status but reduces its fitness, implying a lack of bidirectional facilitation.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The association between a nurse cushion plant and a cluster root‐bearing tree species alters the plant community structure

et al. 2019

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“…Lomatia hirsuta and Acaena splendens have large leaves and accumulate the highest amounts of litter biomass (de Paz et al, 2013). (Sokal & Rohlf, 1969) in which the treatment was the plant population beneath the canopy, and the control, the plant population outside the canopy (open spaces).…”

Section: Evergreen Speciesmentioning

confidence: 99%

Outcomes of facilitative plant interactions in shrublands of NW Patagonia, Argentina

Paz

Raffaele

Gobbi

2021

J Vegetation Science

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Aims This study examined the plant–plant interaction networks and analyzed to what extent different nurse species groups with different traits (evergreen and deciduous) mediate the outcomes of the facilitated species composition. Location Four shrublands located in Nahuel Huapi National Park, in Northern Patagonia, Argentina (41°11'55.34" S, 71°19'43.07" W). Methods We selected 10 woody species as nurse species: five evergreens and five deciduous species. We recorded species composition and total cover below nurse species and in open spaces during two consecutive years, with different interannual precipitation variability. We determined the facilitated species with the relative interaction intensity in plants (RII) index, constructed facilitation networks, and analyzed the species composition below nurses and in open spaces. Results In our networks, nurse and facilitated species are generalist species. The species composition below the nurse canopies and open areas varied between years. The structure and parameters of networks built on two consecutive years were similar. However, we found changes in plant species interactions between the studied years. The species composition of the facilitated species growing below the deciduous and evergreen nurse species groups was similar. Conclusions Our findings provide insights into knowledge of the facilitation networks in Patagonian shrublands. We found that networks were not nested and had many generalist species (nurses and facilitated). This implies that the disappearance of any nurse species would not change the community maintenance.

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“…Leaf litter is one of the main detritus cover type in this community (de Paz et al 2013). It is important for protecting the soil from erosion, increase aeration and regulate temperatures (Sayer 2006).…”

Section: Soil Formation and Protection Esmentioning

confidence: 99%

Effects of firewood harvesting intensity on biodiversity and ecosystem services in shrublands of northern Patagonia

et al. 2020

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Background: Forest management has historically focused on provisioning of goods (e.g. timber, biomass), but there is an increasing interest to manage forests also to maintain biodiversity and to provide other ecosystem services (ES). Methods: We evaluated the effects of firewood harvesting intensity on biodiversity and different ES in three contrasting shrubland sites in northern Patagonia (Argentina). At each site, four harvesting treatments, representing various levels of harvest intensity, were randomly assigned to eight permanent sample plots of 31.5 m × 45 m during 2013-2014. Results: We found that the effects of increasing harvesting intensity on plant diversity changed from negative to positive (and from nonlinear to more linear responses) with increasing site productivity. Harvesting intensity showed contrasting effects on variables related to fire protection ecosystem service, since it reduced fuel amount (potentially reducing fire spread) but also reduced live fuel moisture content (potentially increasing flammability) at the three sites. Two variables related to soil formation and protection ES, leaf litter cover and aerial soil cover, decreased with harvesting intensity at the three sites. Conclusions: We conclude that shrubland management for firewood production may enhance biodiversity without compromising certain important ES. The intensity of harvesting should be determined according to site conditions and forecasted impacts on biodiversity, fire and soil formation and protection.

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Mantillo de las especies leñosas de matorrales del no de la Patagonia: abundancia, composición, estructura y heterogeneidad

Cited by 10 publications

References 3 publications

The association between a nurse cushion plant and a cluster root‐bearing tree species alters the plant community structure

The association between a nurse cushion plant and a cluster root‐bearing tree species alters the plant community structure

Outcomes of facilitative plant interactions in shrublands of NW Patagonia, Argentina

Effects of firewood harvesting intensity on biodiversity and ecosystem services in shrublands of northern Patagonia

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