Modeling the mechanisms of conifer mortality under seawater exposure.

Autor: Ding J; Biological Sciences Division, Pacific Northwest National Lab, PO Box 999, Richland, WA, 99352, USA., McDowell N; Biological Sciences Division, Pacific Northwest National Lab, PO Box 999, Richland, WA, 99352, USA.; School of Biological Sciences, Washington State University, PO Box 644236, Pullman, WA, 99164-4236, USA., Fang Y; Earth Systems Science Division, Pacific Northwest National Lab, Richland, WA, 99352, USA., Ward N; Marine and Coastal Research Laboratory, Pacific Northwest National Laboratory, Sequim, WA, 98382, USA., Kirwan ML; Virginia Institute of Marine Science, College of William and Mary, Gloucester Point, VA, 23062, USA., Regier P; Marine and Coastal Research Laboratory, Pacific Northwest National Laboratory, Sequim, WA, 98382, USA., Megonigal P; Smithsonian Environmental Research Center, Edgewater, MD, 21037, USA., Zhang P; CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China., Zhang H; Shapotou Desert Research and Experiment Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China., Wang W; The Key Laboratory of Mountain Environment Evolution and Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, 610041, China., Li W; State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, 730020, China., Pennington SC; Joint Global Change Research Institute, Pacific Northwest National Laboratory, College Park, MD, 20740, USA., Wilson SJ; Smithsonian Environmental Research Center, Edgewater, MD, 21037, USA., Stearns A; Smithsonian Environmental Research Center, Edgewater, MD, 21037, USA., Bailey V; Biological Sciences Division, Pacific Northwest National Lab, PO Box 999, Richland, WA, 99352, USA.
Jazyk: angličtina
Zdroj: The New phytologist [New Phytol] 2023 Sep; Vol. 239 (5), pp. 1679-1691. Date of Electronic Publication: 2023 Jun 27.
DOI: 10.1111/nph.19076
Abstrakt: Relative sea level rise (SLR) increasingly impacts coastal ecosystems through the formation of ghost forests. To predict the future of coastal ecosystems under SLR and changing climate, it is important to understand the physiological mechanisms underlying coastal tree mortality and to integrate this knowledge into dynamic vegetation models. We incorporate the physiological effect of salinity and hypoxia in a dynamic vegetation model in the Earth system land model, and used the model to investigate the mechanisms of mortality of conifer forests on the west and east coast sites of USA, where trees experience different form of sea water exposure. Simulations suggest similar physiological mechanisms can result in different mortality patterns. At the east coast site that experienced severe increases in seawater exposure, trees loose photosynthetic capacity and roots rapidly, and both storage carbon and hydraulic conductance decrease significantly within a year. Over time, further consumption of storage carbon that leads to carbon starvation dominates mortality. At the west coast site that gradually exposed to seawater through SLR, hydraulic failure dominates mortality because root loss impacts on conductance are greater than the degree of storage carbon depletion. Measurements and modeling focused on understanding the physiological mechanisms of mortality is critical to reducing predictive uncertainty.
(© 2023 The Authors. New Phytologist © 2023 New Phytologist Foundation.)
Databáze: MEDLINE
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