A Vegetation Map of Nevados De Chillan Volcanic Complex, Bio-Bio Region, Chile

Pfanzelt, Simon; Grau, Jürke; Rodríguez, Roberto

doi:10.4067/s0717-66432008000200007

Cited by 10 publications

(6 citation statements)

References 9 publications

(12 reference statements)

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“…Lomatia ferruginea and Gevuina avellana are often later colonists on the the same soil types as Embothrium coccineum, with the order of colonization reflecting higher shade tolerance and lower dispersal ability of Gevuina avellana. Orites myrtoideae colonizes andesitic and dacitic lava flows and outcrops in central Chile that are nearly devoid of soil (Pfanzelt et al, 2008); its cluster roots may be critical to P nutrition and may increase P availability to other colonists. Lomatia hirsuta is also a common colonist of drier forests and shrublands on volcanic soils that are disturbed by burning and grazing.…”

Section: Leaf Anatomy and Morphologymentioning

confidence: 99%

Phosphorus-mobilization ecosystem engineering: the roles of cluster roots and carboxylate exudation in young P-limited ecosystems

et al. 2012

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† Background Carboxylate-releasing cluster roots of Proteaceae play a key role in acquiring phosphorus (P) from ancient nutrient-impoverished soils in Australia. However, cluster roots are also found in Proteaceae on young, P-rich soils in Chile where they allow P acquisition from soils that strongly sorb P. † Scope Unlike Proteaceae in Australia that tend to proficiently remobilize P from senescent leaves, Chilean Proteaceae produce leaf litter rich in P. Consequently, they may act as ecosystem engineers, providing P for plants without specialized roots to access sorbed P. We propose a similar ecosystem-engineering role for species that release large amounts of carboxylates in other relatively young, strongly P-sorbing substrates, e.g. young acidic volcanic deposits and calcareous dunes. Many of these species also fix atmospheric nitrogen and release nutrient-rich litter, but their role as ecosystem engineers is commonly ascribed only to their diazotrophic nature. † Conclusions We propose that the P-mobilizing capacity of Proteaceae on young soils, which contain an abundance of P, but where P is poorly available, in combination with inefficient nutrient remobilization from senescing leaves allows these species to function as ecosystem engineers. We suggest that diazotrophic species that colonize young soils with strong P-sorption potential should be considered for their positive effect on P availability, as well as their widely accepted role in nitrogen fixation. Their P-mobilizing activity possibly also enhances their nitrogen-fixing capacity. These diazotrophic species may therefore facilitate the establishment and growth of species with less-efficient P-uptake strategies on more-developed soils with low P availability through similar mechanisms. We argue that the significance of cluster roots and high carboxylate exudation in the development of young ecosystems is probably far more important than has been envisaged thus far.

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Section: Leaf Anatomy and Morphologymentioning

confidence: 99%

Phosphorus-mobilization ecosystem engineering: the roles of cluster roots and carboxylate exudation in young P-limited ecosystems

et al. 2012

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“…In this area, the treeline is determined by Nothofagus pumilio and N. antarctica at approximately 2,100 m above sea level ( Fajardo et al, 2011 ; Piper et al, 2016 ). Above there, the alpine zone comprises an elevation range from 2,100 to 2,700 m ( Pfanzelt et al, 2008 ). Vegetation is short (<150 cm), and arranged in plant assemblages of shrubs, rosettes, grasses, and geophytes ( Pfanzelt et al, 2008 ).…”

Section: Methodsmentioning

confidence: 99%

“…Above there, the alpine zone comprises an elevation range from 2,100 to 2,700 m ( Pfanzelt et al, 2008 ). Vegetation is short (<150 cm), and arranged in plant assemblages of shrubs, rosettes, grasses, and geophytes ( Pfanzelt et al, 2008 ). For example, lower elevation portion (2100–2,300 m) comprises several shrubs ( Berberis empetrifolia , Azorella prolifera ) and herbaceous species ( Adesmia emarginata, Grausa lateritia ) assemblages, which coincides with one of the southmost xerophytic formations in Chile ( Figure 1 ; Donoso, 1982 ; Squeo et al, 2001 ; Moreira and Cereceda, 2013 ).…”

Section: Methodsmentioning

confidence: 99%

Relieving your stress: PGPB associated with Andean xerophytic plants are most abundant and active on the most extreme slopes

Aguilera-Torres

Riveros²,

Morales³

et al. 2023

Front. Microbiol.

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IntroductionPlants interact with plant growth-promoting bacteria (PGPB), especially under stress condition in natural and agricultural systems. Although a potentially beneficial microbiome has been found associated to plants from alpine systems, this plant- PGPB interaction has been scarcely studied. Nevados de Chillán Complex hold one of the southernmost xerophytic formations in Chile. Plant species living there have to cope with drought and extreme temperatures during the growing season period, microclimatic conditions that become harsher on equatorial than polar slopes, and where the interaction with PGPB could be key for plant survival. Our goal was to study the abundance and activity of different PGPB associated to two abundant plant species of Andean xerophytic formations on contrasting slopes.MethodsTwenty individuals of Berberis empetrifolia and Azorella prolifera shrubs were selected growing on a north and south slope nearby Las Fumarolas, at 2,050 m elevation. On each slope, microclimate based on temperature and moisture conditions were monitored throughout the growing period (oct. – apr.). Chemical properties of the soil under plant species canopies were also characterized. Bacterial abundance was measured as Log CFU g−1 from soil samples collected from each individual and slope. Then, the most abundant bacterial colonies were selected, and different hormonal (indoleacetic acid) and enzymatic (nitrogenase, phosphatase, ACC-deaminase) mechanisms that promote plant growth were assessed and measured.Results and DiscussionExtreme temperatures were observed in the north facing slope, recording the hottest days (41 vs. 36°C) and coldest nights (−9.9 vs. 6.6°C). Moreover, air and soil moisture were lower on north than on south slope, especially late in the growing season. We found that bacterial abundance was higher in soils on north than on south slope but only under B. empetrifolia canopy. Moreover, the activity of plant growth-promoting mechanisms varied between slopes, being on average higher on north than on south slope, but with plant species-dependent trends. Our work showed how the environmental heterogeneity at microscale in alpine systems (slope and plant species identity) underlies variations in the abundance and plant growth promoting activity of the microorganisms present under the plant canopy of the Andean xerophytic formations and highlight the importance of PGPB from harsh systems as biotechnological tools for restoration.

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“…Phacelia secunda se registró como colonizadora en taludes de canteras de extracción de áridos (Arce et al 2015), en ambientes con depósito de ceniza volcánica (López et al 2010) y matorrales post-fuego de la Patagonia (Raffaele & Veblen 1998). Eryngium paniculatum suele encontrarse en laderas escarpadas y rocosas (Pfanzelt et al 2008), en bordes de rutas y vías férreas (Troiani & Steibel 2008), y es colonizadora de matorrales postfuego (Fernández et al 2010).…”

Section: Introductionunclassified

Germinación de Phacelia secunda (Boraginaceae) y Eryngium paniculatum (Apiaceae), hierbas perennes de la Patagonia Argentina

2019

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El objetivo fue evaluar los requerimientos de germinación de Phacelia secunda J.F. Gmel. y Eryngium paniculatum Cav. y Dombey ex F. Delaroche, herbáceas perennes colonizadoras de ambientes degradados del noroeste patagónico argentino y de interés para la restauración ecológica. Se evaluó el porcentaje, tiempo medio e inicio de germinación en un control (C) y dos tratamientos pre-germinativos: escarificación mecánica con bisturí (EM) y estratificación húmeda fría durante 45 días (EHF). En P. secunda, el porcentaje de germinación en el tratamiento EHF (2%) fue menor que en el C (24%) y el tratamiento EM (16%). En E. paniculatum se encontraron diferencias entre el C (94%) y el tratamiento EHF (82%), pero no entre el C y EM (91%). El tratamiento EHF aceleró el inicio de la geminación en ambas especies. Las semillas de P. secunda mostraron baja capacidad de germinación siendo necesario evaluar nuevos tratamientos. Eryngium paniculatum mostró alta capacidad germinativa aún en el control, lo que evidencia que no requiere tratamientos pre-germinativos específicos.

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A Vegetation Map of Nevados De Chillan Volcanic Complex, Bio-Bio Region, Chile

Cited by 10 publications

References 9 publications

Phosphorus-mobilization ecosystem engineering: the roles of cluster roots and carboxylate exudation in young P-limited ecosystems

Phosphorus-mobilization ecosystem engineering: the roles of cluster roots and carboxylate exudation in young P-limited ecosystems

Relieving your stress: PGPB associated with Andean xerophytic plants are most abundant and active on the most extreme slopes

Germinación de Phacelia secunda (Boraginaceae) y Eryngium paniculatum (Apiaceae), hierbas perennes de la Patagonia Argentina

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