Carbon and nitrogen dynamics in a sandy groundwater-coupled ecosystem in the Monte Desert, indicated by plant stable isotopes

Aranibar, Julieta N.; Goirán, Silvana B.; Guevara, Aranzazú; Villagra, Pablo E.

doi:10.1016/j.jaridenv.2013.11.005

Cited by 13 publications

(5 citation statements)

References 55 publications

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“…Our findings of foliar δ 15 N support the idea that P . flexuosa can use different sources of N (Aranibar et al ., ), according to the N availability in the soils. Furthermore, the decrease of δ 15 N values with season progress in control woodlands during a year of low precipitations suggests the occurrence of N 2 fixation under conditions of low N availability.…”

Section: Discussionmentioning

confidence: 97%

Does land use change alter water and nutrient dynamics of phreatophytic trees in the Central Monte desert?

2015

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In the woodlands of the Central Monte desert (Argentina), phreatophyte vegetation is exposed to different levels of disturbance. Livestock and settlement activity produce mainly nutrient inputs and partial vegetation removal, with a consequent reduction on water use by vegetation. We hypothesize that because of the increased soil water and nutrient resources associated with livestock stations, water stress will be relieved for the remaining Prosopis flexuosa trees, favouring water and nutrient status, and plant growth at the plant scale. The goal of this research was to analyse the physiological responses of P. flexuosa trees that grow in interdune valleys under different land uses, and the changes in relative importance of environmental factors controlling these responses. We compared the ecophysiological responses of adult P. flexuosa trees in two contrasting types of disturbance: disturbed (livestock stations) and relatively undisturbed (control woodlands) stands, in the 2011-2013 growing seasons. Pre-dawn and midday leaf water potential and stomatal conductance were higher in livestock stations than in control woodlands, suggesting a better water status of P. flexuosa in livestock stations. Isotopic composition (lower δ 13 C, and higher δ 15 N) and foliar nitrogen concentration (lower C:N ratios) indicated lower water use efficiency and higher nitrogen absorption from the soil in livestock stations. Both growth of new leaves (foliar area) and the length of young branches were higher in the first season for both land uses, but branch length was higher in livestock stations. This is consistent with the idea that vegetation removal and nutrient contribution of settlement activities improved water and nutrient status of remaining vegetation, and modified the relative importance of factors controlling ecophysiological processes. We concluded that physiological responses and vegetative growth of P. flexuosa were not only affected by meteorological conditions (rainfalls, vapour pressure deficit), but also by the ecohydrological changes caused by changes in land use.

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Section: Discussionmentioning

confidence: 97%

Does land use change alter water and nutrient dynamics of phreatophytic trees in the Central Monte desert?

2015

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“…It has an extended root system which acquires water from deep groundwater resources (Alvarez and Villagra et al, 2009), and dominates the tree layer in inter-dune valleys of the Telteca reserve. Plant species and life forms differ in dune flanks, interdunes, and old riverbeds, with a higher vegetation cover in inter-dune valleys than in the other landforms (Aranibar et al, 2014). Generally, as in other deserts, vascular plants form patches of several species, in a matrix of bare soil or annual grasses and herbs.…”

Section: Study Areamentioning

confidence: 99%

Multiscale effects on biological soil crusts cover and spatial distribution in the Monte Desert

2015

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“…A nivel ecológico, al ajustar el grado de resolución de los recursos vegetales en el área de la LBB, el género Prosopis (algarrobo) se destaca como uno de los componentes clave del hábitat, localizándose en lugares con una provisión extra de agua, como márgenes de ríos o bordes de paleocauces (e.g., localidad de Puesto Cuello-Cueva Yagui). Como especies freatófitas, la disponibilidad hídrica condiciona la distribución de los algarrobales, que puede ser fragmentada y heterogénea (Aranibar et al 2014). Esta característica potencia los espacios intermedios, por ser una zona donde el agua es un recurso de fácil acceso anual y los algarrobos crecen como parches en el paisaje estableciendo formaciones edáficas azonales (Figura 2b).…”

Section: Movilidad Y Uso Humano Del Espacio En Un Paisaje De Transiciunclassified

Arqueología distribucional y biogeografía humana en un paisaje andino-patagónico

Rughini¹,

Villanueva²,

Ferreyra³

et al. 2020

Latin Am. antiq.

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Nuestro objetivo es estudiar las estrategias de uso del espacio por parte de sociedades humanas móviles en un paisaje andino de Patagonia caracterizado por una marcada heterogeneidad topográfica, climática y ecológica (localidad de Barrancas-Buta Ranquil, provincia del Neuquén, Argentina). Inicialmente, se analiza la estructura del paisaje desde una perspectiva biogeográfica, desarrollando un modelo de estacionalidad mediante sistemas de información geográfica. Nuestro enfoque distribucional combina una prospección sistemática para caracterizar la estructura espacial del registro en superficie y evidencias que han sido obtenidas bajo otras estrategias de muestreo. Sobre la base de la distribución de artefactos líticos y cerámicos y de motivos rupestres, se evalúan patrones de intensidad ocupacional, diversidad funcional y circulación de información en sectores del espacio con propiedades biogeográficas diferentes. Los resultados sugieren una delimitación funcional del espacio en escala temporal promediada, en la cual los espacios intermedios habrían funcionado como lugares centrales desde donde se articulan movimientos logísticos hacia otros sectores del paisaje. Dado que la unidad de muestreo captura variación biogeográfica que se expresa en forma regional más amplia, el modelo de uso del espacio propuesto es relevante para la comprensión de la arqueología del noroeste de Patagonia en general.

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Carbon and nitrogen dynamics in a sandy groundwater-coupled ecosystem in the Monte Desert, indicated by plant stable isotopes

Cited by 13 publications

References 55 publications

Does land use change alter water and nutrient dynamics of phreatophytic trees in the Central Monte desert?

Does land use change alter water and nutrient dynamics of phreatophytic trees in the Central Monte desert?

Multiscale effects on biological soil crusts cover and spatial distribution in the Monte Desert

Arqueología distribucional y biogeografía humana en un paisaje andino-patagónico

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