Increasing atmospheric humidity and CO2 concentration alleviate forest mortality risk

Liu, Yanlan; Parolari, Anthony J.; Kumar, Mukesh; Huang, Cheng-Wei; Katul, Gabriel G.; Porporato, Amilcare

doi:10.1073/pnas.1704811114

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Increasing atmospheric humidity and CO2 concentration alleviate forest mortality risk

2017
By Liu, Yanlan ; Parolari, Anthony J. ; Kumar, Mukesh ; ...
Source: PNAS 114 (37) 9918-9923; https://doi.org/10.1073/pnas.1704811114

[PDF-3.97 MB]

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Journal Title:

Proceedings of the National Academy of Sciences of the United States of America
Personal Author:

Liu, Yanlan ; Parolari, Anthony J. ; Kumar, Mukesh ; Huang, Cheng-Wei ; Katul, Gabriel G. ; ... More +

Liu, Yanlan ; Parolari, Anthony J. ; Kumar, Mukesh ; Huang, Cheng-Wei ; Katul, Gabriel G. ; Porporato, Amilcare Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; PSL (Physical Sciences Laboratory) ; NWS (National Weather Service) ; NCEP (National Centers for Environmental Prediction)

OAR (Oceanic and Atmospheric Research) ; ESRL (Earth System Research Laboratory) ; PSL (Physical Sciences Laboratory) ; NWS (National Weather Service) ; NCEP (National Centers for Environmental Prediction) Less -
Description:

Climate-induced forest mortality is being increasingly observed throughout the globe. Alarmingly, it is expected to exacerbate under climate change due to shifting precipitation patterns and rising air temperature. However, the impact of concomitant changes in atmospheric humidity and CO2 concentration through their influence on stomatal kinetics remains a subject of debate and inquiry. By using a dynamic soil-plant-atmosphere model, mortality risks associated with hydraulic failure and stomatal closure for 13 temperate and tropical forest biomes across the globe are analyzed. The mortality risk is evaluated in response to both individual and combined changes in precipitation amounts and their seasonal distribution, mean air temperature, specific humidity, and atmospheric CO2 concentration. Model results show that the risk is predicted to significantly increase due to changes in precipitation and air temperature regime for the period 2050-2069. However, this increase may largely get alleviated by concurrent increases in atmospheric specific humidity and CO2 concentration. The increase in mortality risk is expected to be higher for needle-leaf forests than for broadleaf forests, as a result of disparity in hydraulic traits. These findings will facilitate decisions about intervention and management of different forest types under changing climate.
Keywords:

[+]

Climate Change Closure Die-off Drought Enrichment Face Forest Mortality Hydraulic Failure Hydraulics Induced Tree Mortality Mechanisms Photosynthesis Responses Science Stomatal Stomatal Conductance Technology Water-use Efficiency
Source:

PNAS 114 (37) 9918-9923; https://doi.org/10.1073/pnas.1704811114
DOI:

https://doi.org/10.1073/pnas.1704811114
Pubmed ID:

28847949
Pubmed Central ID:

PMC5604008
Document Type:

Journal Article
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PMC
Main Document Checksum:

[+]

urn:sha256:4e23fd2bdfaea7184f1dcd0761bbf271b333763dbea493caf0f259d937236b41
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https://repository.library.noaa.gov/view/noaa/29223/noaa_29223_DS1.pdf
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Increasing atmospheric humidity and CO2 concentration alleviate forest mortality risk

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