Stability of tropical forest tree carbon‐water relations in a rainfall exclusion treatment through shifts in effective water uptake depth

Pivovaroff, Alexandria L.; McDowell, Nate G.; Rodrigues, Tayana Barrozo; Brodribb, Timothy J.; Cernusak, Lucas A.; Choat, Brendan; Grossiord, Charlotte; Ishida, Yoko; Jardine, Kolby; Laurance, Susan G.; Leff, Riley; Li, Weibin; Liddell, Michael J.; Mackay, D. S.; Pacheco, Heather; Peters, Jennifer M R; Filho, Israel De Jesus Sampaio; Souza, Daisy C.; Wang, Wenzhi; Zhang, Peipei; Chambers, J. Q.

doi:10.1111/gcb.15869

Cited by 25 publications

(15 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, Mu et al (2021) showed that incorporating a groundwater scheme into CABLE (without plant hydraulics) increased transpiration by c. 100 mm yr −1 during the 2017-2019 drought, predominantly by reducing vertical drainage. Future model developments that link improvements in plant hydraulics to improvements in subsurface hydrology, including the role of deeper root water access (via tap roots, but please refer to Pivovaroff et al, 2021), are needed.…”

Section: Stomatal Controlmentioning

confidence: 99%

Towards species‐level forecasts of drought‐induced tree mortality risk

et al. 2022

Self Cite

View full text Add to dashboard Cite

Predicting species-level responses to drought at the landscape scale is critical to reducing uncertainty in future terrestrial carbon and water cycle projections.We embedded a stomatal optimisation model in the Community Atmosphere Biosphere Land Exchange (CABLE) land surface model and parameterised the model for 15 canopy dominant eucalypt tree species across South-Eastern Australia (mean annual precipitation range: 344-1424 mm yr −1 ). We conducted three experiments: applying CABLE to the 2017-2019 drought; a 20% drier drought; and a 20% drier drought with a doubling of atmospheric carbon dioxide (CO 2 ).The severity of the drought was highlighted as for at least 25% of their distribution ranges, 60% of species experienced leaf water potentials beyond the water potential at which 50% of hydraulic conductivity is lost due to embolism. We identified areas of severe hydraulic stress within-species' ranges, but we also pinpointed resilience in species found in predominantly semiarid areas. The importance of the role of CO 2 in ameliorating drought stress was consistent across species.Our results represent an important advance in our capacity to forecast the resilience of individual tree species, providing an evidence base for decision-making around the resilience of restoration plantings or net-zero emission strategies.

show abstract

Section: Stomatal Controlmentioning

confidence: 99%

Towards species‐level forecasts of drought‐induced tree mortality risk

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…The model was forced with hourly meteorological observations during the growing seasondetermined with the approach in Sperry et al (2019)including precipitation, air temperature, solar radiation, atmospheric VPD, and wind speed, and parameterized with stand, soil, plant, photosynthetic, atmospheric, and embolism vulnerability curve measurements (Table S1). The original model code was compiled to interface with R language and run using the EZSPERRY package (Leff, 2020;Pivovaroff et al, 2021) in R 4.0.4 (R Development Core Team, 2020).…”

Section: Soil Porewater Salinity Measurements and Modelingmentioning

confidence: 99%

The influence of increasing atmospheric CO₂, temperature, and vapor pressure deficit on seawater‐induced tree mortality

McDowell

Zhang

et al. 2022

New Phytologist

Self Cite

View full text Add to dashboard Cite

Increasing seawater exposure is killing coastal trees globally, with expectations of accelerating mortality with rising sea levels. However, the impact of concomitant changes in atmospheric CO 2 concentration, temperature, and vapor pressure deficit (VPD) on seawater-induced tree mortality is uncertain.We examined the mechanisms of seawater-induced mortality under varying climate scenarios using a photosynthetic gain and hydraulic cost optimization model validated against observations in a mature stand of Sitka spruce (Picea sitchensis) trees in the Pacific Northwest, USA, that were dying from recent seawater exposure.The simulations matched well with observations of photosynthesis, transpiration, nonstructural carbohydrates concentrations, leaf water potential, the percentage loss of xylem conductivity, and stand-level mortality rates. The simulations suggest that seawater-induced mortality could decrease by c. 16.7% with increasing atmospheric CO 2 levels due to reduced risk of carbon starvation. Conversely, rising VPD could increase mortality by c. 5.6% because of increasing risk of hydraulic failure.Across all scenarios, seawater-induced mortality was driven by hydraulic failure in the first 2 yr after seawater exposure began, with carbon starvation becoming more important in subsequent years. Changing CO 2 and climate appear unlikely to have a significant impact on coastal tree mortality under rising sea levels.

show abstract

“…Furthermore, sap flow measurements at lowland, midelevation, and high elevation sites in the Australian Wet Tropics indicated that transpiration at the tree level is largely unresponsive to seasonal variations in soil moisture (McJannet et al, 2007;Binks et al, 2022). At the Daintree Rainforest Observatory, a lowland site, a multi-year throughfall exclusion experiment resulted in no response of foliar δ 13 C in the treated plot compared to the control plot (Pivovaroff et al, 2021). Finally, mean foliar δ 13 C values in our study for the three species with broader elevation ranges were very similar in the glasshouse compared to the field (F. ifflana, -29.3 vs. -29.2 ; F. bourjotiana, -29.6 vs. -29.6 ; F. brayleyana, -30.7 vs. -30.5 ), as can also be seen in Figures 2, 4.…”

Section: Foliar δ 13 C and Elevationmentioning

confidence: 98%

Temperature, nutrient availability, and species traits interact to shape elevation responses of Australian tropical trees

Ramesh¹,

Cheesman²,

Flores‐Moreno³

et al. 2023

Front. For. Glob. Change

Self Cite

View full text Add to dashboard Cite

Elevation gradients provide natural laboratories for investigating tropical tree ecophysiology in the context of climate warming. Previously observed trends with increasing elevation include decreasing stem diameter growth rates (GR), increasing leaf mass per area (LMA), higher root-to-shoot ratios (R:S), increasing leaf δ13C, and decreasing leaf δ15N. These patterns could be driven by decreases in temperature, lower soil nutrient availability, changes in species composition, or a combination thereof. We investigated whether these patterns hold within the genus Flindersia (Rutaceae) along an elevation gradient (0–1,600 m) in the Australian Wet Tropics. Flindersia species are relatively abundant and are important contributors to biomass in these forests. Next, we conducted a glasshouse experiment to better understand the effects of temperature, soil nutrient availability, and species on growth, biomass allocation, and leaf isotopic composition. In the field, GR and δ15N decreased, whereas LMA and δ13C increased with elevation, consistent with observations on other continents. Soil C:N ratio also increased and soil δ15N decreased with increasing elevation, consistent with decreasing nutrient availability. In the glasshouse, relative growth rates (RGR) of the two lowland Flindersia species responded more strongly to temperature than did those of the two upland species. Interestingly, leaf δ13C displayed an opposite relationship with temperature in the glasshouse compared with that observed in the field, indicating the importance of covarying drivers in the field. Leaf δ15N increased in nutrient-rich compared to nutrient-poor soil in the glasshouse, like the trend in the field. There was a significant interaction for δ15N between temperature and species; upland species showed a steeper increase in leaf δ15N with temperature than lowland species. This could indicate more flexibility in nitrogen acquisition in lowland compared to upland species with warming. The distinguishing feature of a mountaintop restricted Flindersia species in the glasshouse was a very high R:S ratio in nutrient-poor soil at low temperatures, conditions approximating the mountaintop environment. Our results suggest that species traits interact with temperature and nutrient availability to drive observed elevation patterns. Capturing this complexity in models will be challenging but is important for making realistic predictions of tropical tree responses to global warming.

show abstract

Stability of tropical forest tree carbon‐water relations in a rainfall exclusion treatment through shifts in effective water uptake depth

Abstract: Article type : Primary Research Article Stability of tropical forest tree carbon-water relations in a rainfall exclusion treatment through shifts in effective water uptake depth

Cited by 25 publications

References 61 publications

Towards species‐level forecasts of drought‐induced tree mortality risk

Towards species‐level forecasts of drought‐induced tree mortality risk

The influence of increasing atmospheric CO₂, temperature, and vapor pressure deficit on seawater‐induced tree mortality

Temperature, nutrient availability, and species traits interact to shape elevation responses of Australian tropical trees

Contact Info

Product

Resources

About

Stability of tropical forest tree carbon‐water relations in a rainfall exclusion treatment through shifts in effective water uptake depth

Abstract: Article type : Primary Research Article Stability of tropical forest tree carbon-water relations in a rainfall exclusion treatment through shifts in effective water uptake depth

Cited by 25 publications

References 61 publications

Towards species‐level forecasts of drought‐induced tree mortality risk

Towards species‐level forecasts of drought‐induced tree mortality risk

The influence of increasing atmospheric CO2, temperature, and vapor pressure deficit on seawater‐induced tree mortality

Temperature, nutrient availability, and species traits interact to shape elevation responses of Australian tropical trees

Contact Info

Product

Resources

About

The influence of increasing atmospheric CO₂, temperature, and vapor pressure deficit on seawater‐induced tree mortality