Sandra J Bucci

Sandra J Bucci
Institute of Biosciences of the Patagonia (INBIOP) National University of Patagonia San Juan Bosco (UNPSJB) - National Scientific and Technical Research Council (CONICET)

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81
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Publications

Publications (81)
Article
Full-text available
Purpose Soil respiration and N-mineralization are key processes in C and N cycling of terrestrial ecosystems. Both processes are limited by soil temperature, moisture and nutrient content in arid and cold ecosystems, but how soil nutrient addition interacts with increased precipitation requires further investigation. Methods The experiment consist...
Article
Full-text available
Stem capacitance and water storage are known to play an important role in the water economy of trees by acting as an intermediate water source for transpiring leaves. The bark, in addition to be involved in protection and mechanical support of the trees, can also serve as a water reservoir. We examined the relationship between inner bark and sapwoo...
Article
Background and aims: The eco-hydrological significance of leaf wetting due to atmospheric water in arid and semiarid ecosystems is not well understood. In these environments, the inputs of precipitation or dew formation resulting in leaf wetting have positive effects on plant functioning. However, its impact on plant water relations may depend on...
Article
Land use changes due to forestry activities can alter forest carbon (C) sequestration capacity by modifying vegetation structure and ecosystem functioning. The main objective of this study was to analyze aboveground net primary productivity (aNPP), through stem growth and litterfall production, and their feedback on soil C and nutrient contents, wi...
Preprint
Full-text available
Aims: Soil respiration and N-mineralization are key processes in C and N cycling of terrestrial ecosystems. Both processes are limited by soil temperature, moisture and nutrient content in arid and cold ecosystems, but how nutrient addition interacts with water addition requires further investigation. This study addresses the effects of water and N...
Preprint
Stored water in inner tissues can affect plant water balance and its freezing resistance. We studied the water storages in the inner bark and sapwood of Araucaria araucana, a species with thick inner bark. Specifically, we analyzed its daily behavior, the driving force to radial water movement and its freezing resistance. The whole-stem water conte...
Article
Full-text available
Brazilian savanna is a seasonally dry biome, highly diverse and distributed mainly on nutrient-limited soils. Interactions between water stress and nutrient availability are important evolutionary filters in these environments. Previous evidence indicated that reducing the nutritional limitation increases growth rate, optimizes water transport and...
Article
Full-text available
Low temperatures and drought are the main environmental factors affecting plant growth and productivity across most of the terrestrial biomes. The objective of this study was to analyze the effects of water deficits before the onset of low temperatures in winter to enhance freezing resistance in olive trees. The study was carried out near the coast...
Article
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Land-use changes in forest ecosystems may alter the amount of carbon sequestration. The main objective of this study was to characterize the impact of different land-use practices on structure and functioning of humid subtropical forests that are under severe threat. We emphasize the characterization of canopy photosynthetic activity, assessed by t...
Article
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Aims Sand-fixing shrub Salix gordejevii plays an important role in sand dune stabilization but often shows severe decline and mortality on the windward slopes of active dunes. The objective of this study was to explore the environmental drivers and physiological mechanisms behind its decline and mortality on the windward slopes of active sand dunes...
Article
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Plants require mechanisms of defense to limit the amount of damage by herbivores. Calcium oxalate crystals (COC) in the leaves can serve as inducible defenses against chewing insects, such as Caliroa cerasi larvae. We studied the relationship between leaf COC from Prunus avium and herbivory by C. cerasi larvae, to assess the defensive role of induc...
Article
Foliar water uptake (FWU) could be relevant for plants, allowing them to use alternative water sources than the primary one that is soil water uptake and thus prevent dehydration especially during the dry season in arid/semiarid ecosystems characterized by small and erratic water pulses. The main objective of this study was to evaluate the effects...
Article
Full-text available
Foliar water uptake (FWU) has been reported for different species across several ecosystems types. However, little attention has been given to arid ecosystems, where FWU during dew formation or small rain events could ameliorate water deficits. FWU and their effects on leaf water potential (ΨLeaf) were evaluated in grasses and shrubs exploring diff...
Article
Herbivores reduce plant productivity by removing part of the assimilation surface. Also, they can alter plant traits that affect plant–pollinator interactions and reproductive success. The objective of this study was to evaluate the impact of defoliation by sawfly (Caliroa cerasi) larvae on fruit production and quality in three cultivars of sweet c...
Article
Marginal populations are usually under stressful environmental conditions and may render novel phenotypes due to intense selection resulting from evolutionary and ecological changes. Thus the study of phenotypic variation under contrasting environments and their possible genetic basis is highly relevant particularly under changing climates. In Pata...
Article
Dominating sand-fixing shrubs play crucial roles in the stabilization and rehabilitation of sand dunes. Different sand-fixing shrub species often separate along the temporal-spatial environmental gradient during the sand dune stabilization process; however, the physiological mechanisms underlying such a separation remain poorly understood, which li...
Article
Full-text available
Aims Soil respiration is a major flux of CO2 to the atmosphere. Despite its significance there is a limited understanding of its magnitude, controlling factors and how it varies over time and space in arid ecosystems. We evaluated the temporal pattern of soil CO2 efflux and their response to rain pulses in a patagonian steppe, taking into account t...
Article
Differences in key physiological characteristics between plant species can result in their contrasting performances in vegetation restoration projects but ecophysiological comparative studies in close relation to ecological restoration projects are scarce. Hedysarum fruiticosum Pall. and Caragana microphylla Lam. are two leguminous shrub species wi...
Article
The hydraulic coordination along the water transport pathway helps trees provide adequate water supply to the canopy ensuring that water deficits are minimized and that stomata remain open for CO2 uptake. We evaluated the stem and leaf hydraulic coordination and the linkages between hydraulic traits and the timing of diurnal depression of photosynt...
Article
Full-text available
This study of animal–plant interaction focused on the impact of oviposition by an insect on the leaves of Prunus avium (cherries). We examined whether the oviposition by Caliroa cerasi affects leaf mechanical and spectral traits in P. avium. Three cultivars of P. avium were studied. Infested leaves had from 1 to 18 eggs and exhibited higher leaf dr...
Article
Herbivory can trigger physiological processes resulting in leaf and whole plant functional changes. The effects of chronic infestation by an insect on leaf traits related to carbon and nitrogen economy in three Prunus avium cultivars were assessed. Leaves from non-infested trees (control) and damaged leaves from infested trees were selected. The in...
Article
Full-text available
Stems and leaves of Olea europaea L. (olive) avoid freezing damage by substantial supercooling during the winter season. Physiological changes during acclimation to low temperatures were studied in five olive cultivars. Water relations and hydraulic traits, ice nucleation temperature (INT) and temperatures resulting in 50% damage (LT50) were determ...
Article
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Grazing is the predominant land use practice in arid environments; however, there are relatively few studies of grazing effects on ecosystem functioning. We assessed the impact of grazing on soil moisture, evapotranspiration (ET), canopy conductance (Gc), and root water uptake in the patagonian steppe. Studies were done in three sites along a gradi...
Article
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Accurate estimates of seasonal evapotranspiration (ET) at different temporal and spatial scales are essential for understanding the biological and environmental determinants of ecosystem water balance in arid regions and the patterns of water utilization by the vegetation. For this purpose, remote sensing ET estimates of a Patagonian desert in Sout...
Article
Freezing resistance through avoidance or tolerance of extracellular ice nucleation is important for plant survival in habitats with frequent subzero temperatures. However, the role of cell walls in leaf freezing resistance and the coordination between leaf and stem physiological processes under subzero temperatures are not well understood. We studi...
Chapter
Results from water relations and hydraulic architecture studies of trees from tropical savannas and humid tropical and subtropical forests were reanalyzed in view of paradigms related to the (i) physiological significance of hydraulic segmentation across trees with different life history traits and habitats, (ii) determinants of massive tree mortal...
Chapter
Most woody dominated tropical ecosystems are subjected to drought periods of different lengths, from few days or weeks in wet forests to several months in drought deciduous forests and savanna ecosystems. The roots during these low soil water availability periods may experience hydraulic and metabolic dysfunctions resulting not only in a substantia...
Article
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The evolution of lignified xylem allowed for the efficient transport of water under tension, but also exposed the vascular network to the risk of gas emboli and the spread of gas between xylem conduits, thus impeding sap transport to the leaves. A well-known hypothesis proposes that the safety of xylem (its ability to resist embolism formation and...
Article
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The area of tree plantations in the humid subtropical region of Northern Argentina has recently increased five folds. However, the impact of this land use change on evapotranspiration (ET), one of the main components of the hydrologic cycle, has not been evaluated. We studied the ET at tree and ecosystem levels for native forests and three tree pla...
Article
Full-text available
Plants can avoid freezing damage by preventing extracellular ice formation below the equilibrium freezing temperature (supercooling). We used Olea europaea cultivars to assess which traits contribute to avoid ice nucleation at subzero temperatures. Seasonal leaf water relations, non-structural carbohydrates, nitrogen and tissue damage and ice nucle...
Article
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Wood biophysical properties and the dynamics of water storage discharge and refilling were studied in the trunk of canopy tree species with diverse life history and functional traits in subtropical forests of northeast Argentina. Multiple techniques assessing capacitance and storage capacity were used simultaneously to improve our understanding of...
Article
Full-text available
Key message Total leaf hydraulic dysfunction during severe drought could lead to die-back in N. dombeyi , while hydraulic traits of A. chilensis allow it to operate far from the threshold of total hydraulic failure. Abstract Die-back was observed in South America temperate forests during one of the most severe droughts of the 20th century (1998–...
Conference Paper
Background/Question/Methods Droughts are expected to increase in the next 50 years in temperate areas of South America, particularly in the western slopes of the southern Andes covered by Nothofagus and conifers species and in the driest Patagonian ecosystems (steppes). Selective tree dieback has been observed in these temperate forests during on...
Conference Paper
Background/Question/Methods Temporal and spatial variation in water availability is one of the main drivers of ecological diversity in arid ecosystems. Leaf hydraulic conductance (Kleaf) is a key trait governing plant hydraulics, water use and gas exchange under water deficit conditions. As the transpiration stream in leaves occurs through vascul...
Article
Full-text available
Physio-anatomical traits of rootstock have been considered as determinants of vigor in grafted plants. We evaluated how hydraulic traits of three Prunus avium cultivars grown on the same rootstock are related to tree growth and patterns of biomass allocation between vegetative and reproductive parts as well as total water consumption to determine h...
Article
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Leaves can be both a hydraulic bottleneck and a safety valve against hydraulic catastrophic dysfunctions, and thus changes in traits related to water movement in leaves and associated costs may be critical for the success of plant growth. A 4-year fertilization experiment with nitrogen (N) and phosphorus (P) addition was done in a semideciduous Atl...
Article
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Hydraulic architecture was studied in shrub species differing in rooting depth in a cold desert in Southern Argentina. All species exhibited strong hydraulic segmentation between leaves, stems and roots with leaves being the most vulnerable part of the hydraulic pathway. Two types of safety margins describing the degree of conservation of the hydra...
Article
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Water storage in the trunks of large trees plays an important role in wholeplant water balance on both daily and seasonal bases. To investigate the dynamics of water storage and usage in tree trunks, diurnal changes in volumetric water content (VWC) of the sapwood and tree radius including the bark were monitored continuously using frequency domain...
Article
Full-text available
Phenotypic plasticity in morphophysiological leaf traits in response to wind was studied in two dominant shrub species of the Patagonian steppe, used as model systems for understanding effects of high wind speed on leaf water relations and hydraulic properties of small woody plants. Morpho-anatomical traits, hydraulic conductance and conductivity a...
Article
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Shifts in rainfall patterns and increasing temperatures associated with climate change are likely to cause widespread forest decline in regions where droughts are predicted to increase in duration and severity. One primary cause of productivity loss and plant mortality during drought is hydraulic failure. Drought stress creates trapped gas emboli i...
Article
Full-text available
Hydraulic traits were studied for six Nothofagus species from South America (Argentina and Chile), and for three of these species two populations were studied. The main goal was to determine if properties of the water conductive pathway in stems and leaves are functionally coordinated and to assess if leaves are more vulnerable to cavitation than s...
Article
Full-text available
Physiological adjustments to enhance tolerance or avoidance of summer drought and winter freezing were studied in shallow- to deep-rooted Patagonian cold desert shrubs. We measured leaf water potential (ΨL), osmotic potential, tissue elasticity, stem hydraulic characteristics, and stomatal conductance (g S) across species throughout the year, and a...
Article
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Aim This study was aimed to assess the role that leaf litter play in nutrient cycling, nutrient soil availability and ecosystem processes in an oligotrophic tropical savanna. Methods A four year experiment was performed in a Neotropical savanna from the Brazilian plateau (cerrado), in which litter levels were modified, and the resulting changes in...
Chapter
Full-text available
Components of the tree water transport pathway; roots, trunks, branches and leaves; can also serve as water storage compartments and therefore act transiently as intermediate sources of water for transpiring leaves. However, most previous work has focused on gradual depletion and recharge of tree internal water reserves as soil water availability v...
Article
Full-text available
The vegetation of the Patagonian steppe is exposed to low soil water and nutrient availability, low temperatures and strong and frequent winds. These factors determine the structure and functioning of the steppe and influence the morpho-physiological traits of species. This review emphasizes the effects of soil water spatial-temporal dynamics on pl...
Conference Paper
Background/Question/Methods Patagonian steppe plants grow under a combination of factors conducing to a similar number of stresses: low water and nutrient availability, low temperature, high grazing pressure and strong and highly frequent wind. Under these factors plants can adapt at physiological, morphological and/or biochemical level. Previous...
Article
Full-text available
The objective of this study was to assess the magnitude of hydraulic lift in Brazilian savannas (Cerrado) and to test the hypothesis that hydraulic lift by herbaceous plants contributes substantially to slowing the decline of water potential and water storage in the upper soil layers during the dry season. To this effect, field observations of soil...
Article
Tropical savannas including those of central Brazil (Cerrado) serve as an important regulator of energy and mass exchange with the atmosphere. However, the effects of interactions between grasses and deeply rooted trees and shrubs on energy and water fluxes of savannas are not well understood. In this study, eddy-covariance measurements were used t...
Article
Size-related changes in hydraulic architecture, carbon allocation and gas exchange of Sclerolobium paniculatum (Leguminosae), a dominant tree species in Neotropical savannas of central Brazil (Cerrado), were investigated to assess their potential role in the dieback of tall individuals. Trees greater than approximately 6-m-tall exhibited more branc...
Article
Rhizophora mangle L. trees of Biscayne National Park (Florida, USA) have two distinct growth forms: tall trees (5-10 m) growing along the coast and dwarf trees (1 m or less) growing in the adjacent inland zone. Sharp decreases in salinity and thus increases in soil water potential from surface soil to about a depth of 1 m were found at the dwarf ma...
Article
Full-text available
Adaptations of species to capture limiting resources is central for understanding structure and function of ecosystems. We studied the water economy of nine woody species differing in rooting depth in a Patagonian shrub steppe from southern Argentina to understand how soil water availability and rooting depth determine their hydraulic architecture....
Article
Full-text available
Sap flow sensors are uniquely able to continuously monitor whole tree physiology. Recently, Burgess and Dawson (Burgess SSO, Dawson TE, Plant Soil 305:5-13, 2008) urged caution in using sap flow probes to estimate water storage use in trees. Here we respond to three criticisms raised there: (1) Sampling: that tree water storage, estimated from bran...
Article
1. Ecological and physiological characteristics of vascular plants may facilitate or constrain hydraulic lift. Studies of hydraulic lift typically include only one or few species, but in species-rich ecosystems a larger number of representative species needs to be studied. 2. Measurements of sap flow in tap roots, lateral roots and stems, as well...