Changes in foliar carbon isotope composition and seasonal stomatal conductance reveal adaptive traits in Mediterranean coppices affected by drought

Matteo, G. Di; Perini, Luigi; Atzori, Paolo; Angelis, Paolo De; Mei, T. F.; Bertini, Giada; Fabbio, Gianfranco; Mugnozza, Giuseppe Scarascia

doi:10.1007/s11676-014-0532-4

Cited by 10 publications

(5 citation statements)

References 43 publications

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“…Our results suggest that MAP is the strongest predictor for leaf δ 13 C, in line with other observations [6,9]. The soil water content determines the leaf stomatal conductance and photosynthesis, and thereby the water use efficiency (WUE) of plants [39][40][41]. Environmentally induced increases in WUE, such as under drought, are expected to be accompanied by decreases in carbon isotope discrimination, because under drought, changes in pi/pa (ratio of intercellular to atmospheric partial pressures of CO2) and WUE will be largely due to stomatal closure [42].…”

Section: Mean Standard Error Maximum Minimum Coefficient Of Variation(%)supporting

confidence: 90%

Variation of Oriental Oak (Quercus variabilis) Leaf δ13C across Temperate and Subtropical China: Spatial Patterns and Sensitivity to Precipitation

Kang

Zhu

et al. 2015

Forests

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Abstract:The concentration of the carbon-13 isotope (leaf δ 13 C) in leaves is negatively correlated with the mean annual precipitation (MAP) at large geographical scales. In this paper, we explain the spatial pattern of leaf δ 13 C variation for deciduous oriental oak (Quercus variabilis Bl.) across temperate and subtropical biomes and its sensitivity to climate factors such as MAP. There was a 6‰ variation in the leaf δ 13 C values of oak with a significant positive correlation with latitude and negative correlations with the mean annual temperature (MAT) and MAP. There was no correlation between leaf δ 13 C and altitude or longitude. Stepwise multiple regression analyses showed that leaf δ 13 C decreased 0.3‰ per 100 mm increase in MAP. MAP alone could account for 68% of the observed variation in leaf δ 13 C. These results can be used to improve predictions for plant responses to climate change and particularly lower rainfall. OPEN ACCESSForests 2015, 6 2297

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Section: Mean Standard Error Maximum Minimum Coefficient Of Variation(%)supporting

confidence: 90%

Variation of Oriental Oak (Quercus variabilis) Leaf δ13C across Temperate and Subtropical China: Spatial Patterns and Sensitivity to Precipitation

Kang

Zhu

et al. 2015

Forests

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“…There are a number of studies that have investigated the relationship between climate and C isotopic composition of both tree-rings and foliage (e.g. Di Matteo et al 2014;Eilmann et al 2010). A number of studies have also used a dual-isotope approach based on both carbon (d 13 C) and oxygen (d 18 O) isotope ratios of tree-rings and foliage to better understand the physiological processes that alter isotopic compositions (Saurer and Siegwolf 2007;Scheidegger et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Can tree-ring δ15N be used as a proxy for foliar δ15N in European beech and Norway spruce?

Tomlinson

Buchmann

Siegwolf

et al. 2015

Trees

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Key message For long-term environmental investigations, tree-ring d 15 N values are inappropriate proxies for foliar d 15 N for both Fagus sylvatica and Picea abies under moderate N loads. Abstract Currently it is unclear whether stable nitrogen isotope signals of tree-rings are related to those in foliage, and whether they can be used to infer tree responses to environmental changes. We studied foliar and tree-ring nitrogen (d 15 N) and carbon (d 13 C) isotope ratios in European beech (Fagus sylvatica L.) and Norway spruce (Picea abies L.) from six long-term forest monitoring sites in Switzerland together with data on N deposition and soil N availability, as well as a drought response index over the last two decades. For both species, tree-ring d 15 N and d 13 C values were less negative compared to foliar d 15 N and d 13 C values, most likely due to recycling and reallocation of N within the tree and fractionation processes associated with the transport of sucrose and the formation of tree-rings, respectively. Temporal trends recorded in foliar d 15 N were not reflected in tree-ring d 15 N, with much higher variations in tree-rings compared to foliage. Soil N availability and N deposition were partially able to explain changes in foliar d 13 C, while there were no significant correlations between environmental variables and either tree-ring or foliar d 15 N. Our results suggest an uncoupling between the N isotopic composition of tree-rings and foliage. Consequently, treering d 15 N values are inappropriate proxies of foliar d 15 N values under low-to-moderate N deposition loads. Furthermore, at such low levels of deposition, tree-ring d 15 N values are not recommended as archives of tree responses to soil C/N or bulk N deposition.

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“…42 suggested that altitudinal variation in δ 13 C may be negative or unchanged for plants growing in arid and/or semiarid regions, and atmospheric pressure has a negative effect on plant δ 13 C. Di Matteo et al . 43 conducted a replicated field trial to characterize the interacting effects of aspect and intensifying drought on foliar δ 13 C and to quantify temporal variation in stomatal conductance. They found a significant reduction in stomatal conductance (p < 0.01) as the drought increased along a sunny slope, and foliar δ 13 C increased significantly (p < 0.01).…”

Section: Discussionmentioning

confidence: 99%

Responses of Intrinsic Water-use Efficiency and Tree Growth to Climate Change in Semi-Arid Areas of North China

WeiWei

Xinxiao

GuoDong

et al. 2018

Sci Rep

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Tree-level intrinsic water-use efficiency (iWUE) is derived from the tree-ring 13C isotope composition (δ13C) and is an important indicator of the adaptability for trees to climate change. However, there is still uncertainty regarding the relationship between long-term forest ecosystem carbon sequestration capacity and iWUE. To determine whether elevated atmospheric CO2 concentration (Ca) increase iWUE and tree growth (basal area increment, BAI), dendrochronological methods and stable isotope analyses were used to examine annual changes in the tree-ring width and carbon isotope composition (δ13C) of Platycladus orientalis in northern China. The iWUE derived from δ13C has increased significantly (p < 0.01). Long-term iWUE trend was largely and positively driven by the elevated atmospheric CO2 concentration and temperature. We observed a general increase in averaged BAI, which had significant positive correlation with iWUE (R2 = 0.3186, p < 0.01). Increases in iWUE indeed translated into enhanced P. orientalis growth in semi-arid areas of northern China. Elevated atmospheric CO2 concentration significantly (p < 0.01) stimulated P. orientalis biomass accumulation when Ca was less than approximately 320 ppm in the early phase; however, this effect was not pronounced when Ca exceeded 320 ppm.

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Changes in foliar carbon isotope composition and seasonal stomatal conductance reveal adaptive traits in Mediterranean coppices affected by drought

Cited by 10 publications

References 43 publications

Variation of Oriental Oak (Quercus variabilis) Leaf δ13C across Temperate and Subtropical China: Spatial Patterns and Sensitivity to Precipitation

Variation of Oriental Oak (Quercus variabilis) Leaf δ13C across Temperate and Subtropical China: Spatial Patterns and Sensitivity to Precipitation

Can tree-ring δ15N be used as a proxy for foliar δ15N in European beech and Norway spruce?

Responses of Intrinsic Water-use Efficiency and Tree Growth to Climate Change in Semi-Arid Areas of North China

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