Stable isotopes in tropical tree rings: theory, methods and applications

Sleen, Peter van der; Zuidema, Pieter A.; Pons, Thijs L.

doi:10.1111/1365-2435.12889

Cited by 63 publications

(39 citation statements)

References 143 publications

(347 reference statements)

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“…Nonetheless, rainfall is a strong predictor of dW/dc a across long-term studies (e.g., Fig. 1), as well as within shorter-term and individual studies 41 of tropical forests.…”

Section: Discussionmentioning

confidence: 90%

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Rainfall drives variation in rates of change in intrinsic water use efficiency of tropical forests

2019

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Rates of change in intrinsic water use efficiency ( W ) of trees relative to those in atmospheric [CO 2 ] ( c a ) have been mostly assessed via short-term studies (e.g., leaf analysis, flux analysis) and/or step increases in c a (e.g., FACE studies). Here we use compiled data for abundances of carbon isotopes in tree stems to show that on decadal scales, rates of change ( dW/dc a ) vary with location and rainfall within the global tropics. For the period 1915–1995, and including corrections for mesophyll conductance and photorespiration, dW/dc a for drier tropical forests (receiving ~ 1000 mm rainfall) were at least twice that of the wettest (receiving ~ 4000 mm). The data also empirically confirm theorized roles of tropical forests in changes in atmospheric 13 C/ 12 C ratios (the 13 C Suess Effect). Further formal analysis of geographic variation in decade-to-century scale dW/dc a will be needed to refine current models that predict increases in carbon uptake by forests without hydrological cost.

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“…Nonetheless, rainfall is a strong predictor of dW/dc a across long-term studies (e.g., Fig. 1), as well as within shorter-term and individual studies 41 of tropical forests.…”

Section: Discussionmentioning

confidence: 90%

“…30–38 ), as well as leaf-level studies 14,15 strongly support shown long-term patterns (including the influence of rainfall; see ref. 41 for a summary of effects of rainfall on W within individual studies of both ring-forming and ringless trees).…”

Section: Discussionmentioning

confidence: 99%

Rainfall drives variation in rates of change in intrinsic water use efficiency of tropical forests

2019

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“…By contrast, long‐WUE was increased significantly under N addition (Figure 3). The long‐WUE captures variability in availability of other resources such as light, nutrients, and water, which is not the case for the instantaneous measure (Farquhar et al, 1989; van der Sleen, Zuidema, & Pons, 2017). Nonetheless, long‐WUE was enhanced slightly by 2.5%, indicating a minor if any impact of N addition on plant carbon–water relations.…”

Section: Discussionmentioning

confidence: 99%

Global response patterns of plant photosynthesis to nitrogen addition: A meta‐analysis

Liang

Zhang

et al. 2020

Global Change Biology

186

129

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A mechanistic understanding of plant photosynthetic response is needed to reliably predict changes in terrestrial carbon (C) gain under conditions of chronically elevated atmospheric nitrogen (N) deposition. Here, using 2,683 observations from 240 journal articles, we conducted a global meta-analysis to reveal effects of N addition on 14 photosynthesis-related traits and affecting moderators. We found that across 320 terrestrial plant species, leaf N was enhanced comparably on mass basis (N mass , +18.4%) and area basis (N area , +14.3%), with no changes in specific leaf area or leaf mass per area. Total leaf area (TLA) was increased significantly, as indicated by the increases in total leaf biomass (+46.5%), leaf area per plant (+29.7%), and leaf area index (LAI, +24.4%). To a lesser extent than for TLA, N addition significantly enhanced leaf photosynthetic rate per area (A area , +12.6%), stomatal conductance (g s , +7.5%), and transpiration rate (E, +10.5%). The responses of A area were positively related with that of g s , with no changes in instantaneous water-use efficiency and only slight increases in long-term water-use efficiency (+2.5%) inferred from 13 C composition. The responses of traits depended on biological, experimental, and environmental moderators. As experimental duration and N load increased, the responses of LAI and A area diminished while that of E increased significantly. The observed patterns of increases in both TLA and E indicate that N deposition will increase the amount of water used by plants. Taken together, N deposition will enhance gross photosynthetic C gain of the terrestrial plants while increasing their water loss to the atmosphere, but the S U PP O RTI N G I N FO R M ATI O N Additional supporting information may be found online in the Supporting Information section. How to cite this article: Liang X, Zhang T, Lu X, et al. Global response patterns of plant photosynthesis to nitrogen addition: A meta-analysis. Glob Change Biol. 2020;26:3585-3600. https://doi.

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“…These residual correlations most likely reflect higher-frequency effects, such as the common utilization of stored carbohydrate pools or stored soil water pools within the same year. The common use of resources would introduce interseasonal lags in the influence of climate on observed patterns in iWUE, g s and A (Helle & Schleser, 2004;Kimak & Leuenberger, 2015;Kress et al, 2009;Labotka et al, 2016;Leavitt, 2010;Sargeant & Singer, 2016;Vaganov et al, 2009). The linear regression approach that we applied to the EW1 and LW time series was effective in distinguishing sites that show clear evidence of seasonal dependence of isotope ratios on climate.…”

Section: Seasonal Relationships Obscured By Seasonal Lagsmentioning

confidence: 99%

“…Most often, tree-ring stable-isotope analysis is used to study interannual and decadal scale relationships between climate and carbon/water cycling (Bale et al, 2011;Leavitt, 2002;Roden & Ehleringer, 2007;Treydte et al, 2007;Wright & Leavitt, 2006). However, more finely resolved temporal-scale analyses, such as those utilizing the earlywood (EW) and latewood (LW) portions of annual rings, have also been used Fritts, 1976;Griffin et al, 2013;Kerhoulas, Kolb, & Koch, 2017;Labotka, Grissino-Mayer, Mora, & Johnson, 2016;Leavitt, 2002;Meko & Baisan, 2001;Ogée et al, 2009;Pellizzari, Camarero, Gazol, Sangüesa-Barreda, & Carrer, 2016;Sargeant & Singer, 2016;Szejner et al, 2016;Vaganov et al, 2009;Walcroft, Silvester, Whitehead, & Kelliher, 1997). At the onset of the growing season, cambial activity in conifer stems initiates xylogenesis forming earlywood (EW), which is usually characterized by large-diameter tracheids.…”

Section: Introductionmentioning

confidence: 99%

Disentangling seasonal and interannual legacies from inferred patterns of forest water and carbon cycling using tree‐ring stable isotopes

Szejner

Wright

Belmecheri

et al. 2018

Global Change Biology

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Tree-ring carbon and oxygen isotope ratios have been used to understand past dynamics in forest carbon and water cycling. Recently, this has been possible for different parts of single growing seasons by isolating anatomical sections within individual annual rings. Uncertainties in this approach are associated with correlated climate legacies that can occur at a higher frequency, such as across successive seasons, or a lower frequency, such as across years. The objective of this study was to gain insight into how legacies affect cross-correlation in the δ C and δ O isotope ratios in the earlywood (EW) and latewood (LW) fractions of Pinus ponderosa trees at thirteen sites across a latitudinal gradient influenced by the North American Monsoon (NAM) climate system. We observed that δ C from EW and LW has significant positive cross-correlations at most sites, whereas EW and LW δ O values were cross-correlated at about half the sites. Using combined statistical and mechanistic models, we show that cross-correlations in both δ C and δ O can be largely explained by a low-frequency (multiple-year) mode that may be associated with long-term climate change. We isolated, and statistically removed, the low-frequency correlation, which resulted in greater geographical differentiation of the EW and LW isotope signals. The remaining higher-frequency (seasonal) cross-correlations between EW and LW isotope ratios were explored using a mechanistic isotope fractionation-climate model. This showed that lower atmospheric vapor pressure deficits associated with monsoon rain increase the EW-LW differentiation for both δ C and δ O at southern sites, compared to northern sites. Our results support the hypothesis that dominantly unimodal precipitation regimes, such as near the northern boundary of the NAM, are more likely to foster cross-correlations in the isotope signals of EW and LW, potentially due to greater sharing of common carbohydrate and soil water resource pools, compared to southerly sites with bimodal precipitation regimes.

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Stable isotopes in tropical tree rings: theory, methods and applications

Cited by 63 publications

References 143 publications

Rainfall drives variation in rates of change in intrinsic water use efficiency of tropical forests

Rainfall drives variation in rates of change in intrinsic water use efficiency of tropical forests

Global response patterns of plant photosynthesis to nitrogen addition: A meta‐analysis

Disentangling seasonal and interannual legacies from inferred patterns of forest water and carbon cycling using tree‐ring stable isotopes

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