Water status, drought responses, and growth of Prosopis flexuosa trees with different access to the water table in a warm South American desert

Giordano, Carla Valeria; Boccalandro, Hernán E.; Sartor, Carmen Elena; Villagra, Pablo E.

doi:10.1007/s11258-010-9892-9

Cited by 27 publications

(36 citation statements)

References 37 publications

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“…The phenotypic plasticity and the ecophysiological responses of P . flexuosa result from the combination of phreatophytism and drought tolerance (Guevara et al ., ; Giordano et al ., ). Measurements of leaf water potential, osmotic potential and turgor potential indicated that growth of P .…”

Section: Introductionmentioning

confidence: 84%

“…flexuosa trees. Individuals of this species are able to survive and grow in this arid ecosystem because of their physiological plasticity that allows them to exploit different water and nutrient reservoirs (Guevara et al ., ; Villagra et al ., ; Giordano et al ., ). P .…”

Section: Discussionmentioning

confidence: 99%

“…We sampled mature leaves at two sampling times each growing season, trying to obtain two different leaf cohorts, representing different environmental conditions as in Giordano et al . (). The first sampling of each growing season (December) generally represents carbon fixed during dry periods, before the onset of the seasonal rains, while the second cohort (February–March) represents carbon fixed under more humid conditions.…”

Section: Methodsmentioning

confidence: 97%

“…Measurements of leaf water potential, osmotic potential and turgor potential indicated that growth of P . flexuosa trees in the Ñacuñán Biosphere Reserve (Cavagnaro and Passera, ) and the interdune valleys of the Telteca Natural Reserve (Giordano et al ., ) was relatively independent of the amount of summer rainfall. In contrast, growth of adult individuals in dune flanks, disconnected from groundwater, was strongly dependent on summer rainfall (Villagra et al ., ; Giordano et al ., ).…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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

2015

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“…However, the groundwater was not a stable water source for the 38-year-old trees, because the groundwater level declined at 0.1 m per year from 1954 to 2009 in the study area . Thus, the decline of the groundwater level, especially in extremely low rainfall years, would negatively affect the survival of the 38-yearold trees (Giordano et al 2011). Secondly, the 38-year-old trees consumed a higher amount of water than the 18-yearold trees (Meizner 2003), due to the larger DBH and leaf area index of the 38-year-old trees (Table 1), as also indicated by a lower iWUE and higher specific leaf area in the dry year (Fig.…”

Section: Discussionmentioning

confidence: 99%

Intrinsic water use efficiency in wet and dry years at young and old plantations of Pinus sylvestris var. mongolica in semiarid China

Song

Zhu

et al. 2015

Journal of Forest Research

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Rainfall is the most important factor influencing the growth and survival of Mongolian pine (Pinus sylvestris var. mongolica), but the responses of these trees to extremes of rainfall are still poorly understood. Intrinsic water use efficiency (iWUE, as proxied by d 13 C), specific leaf area, dry matter content, soil water content and groundwater level were measured in 18-year-old and 38-year-old Mongolian pine stands (young and old) during two conservative years with extreme rainfalls (280 mm, 2009; and 580 mm, 2010). The results indicated that young trees displayed higher d 13 C values of current-year-old needles in 2009 than in 2010, but no difference was detected in old trees. For both age groups of trees, no significant differences were observed in the specific leaf area and dry matter content of current-year-old needles between the two years. These results suggested that the iWUE of young trees was more sensitive to the extreme rainfall than that of the old trees. The groundwater level remained within vertical root distributions for old trees. In 2009, the mean d 13 C value of the current-year-old needles was higher in young trees than in old trees, but this pattern was reversed in 2010. In conclusion, young trees improved iWUE to acclimate to extremely low rainfall, whereas old trees maintained a lower iWUE, possibly because of the uptake of groundwater.

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Dendroecology of Prosopis Species in the World: Secular Traces of Natural and Anthropic Events and Their Effects on Prosopis Growth

Cangiano

Cendoya

Risio-Allione

et al. 2020

Latin American Dendroecology

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Water status, drought responses, and growth of Prosopis flexuosa trees with different access to the water table in a warm South American desert

Cited by 27 publications

References 37 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?

Intrinsic water use efficiency in wet and dry years at young and old plantations of Pinus sylvestris var. mongolica in semiarid China

Dendroecology of Prosopis Species in the World: Secular Traces of Natural and Anthropic Events and Their Effects on Prosopis Growth

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