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Ozone Susceptibility of Tropical Tree Species
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DOI：10.1111/pce.70777.png)
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Abstract
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Tropical forests account for approximately 60% of global terrestrial photosynthesis, yet their function into the future may be compromised by rising ground-level ozone (O3) pollution. Although O3 is known to impair plant productivity, the physiological mechanisms underlying interspecific variation in O3 susceptibility—especially among tropical trees—remain poorly resolved. Here we exposed 11 tropical tree species to a gradient of O3 concentrations using open-top chambers and quantified whole-plant biomass responses alongside key plant functional traits. Species varied markedly in O3 susceptibility, with relative growth reductions best explained by differences in plant mass per unit leaf area (PMA). Contrary to expectations, antioxidant capacity and leaf mass per area were not predictive of O3 susceptibility of tropical tree species. These findings indicate that fundamental structural traits may mediate tropical tree responses to O3, and that species with higher PMA exhibit greater resilience—within the experimental framework employed here. Our results help inform trait-based risk assessments and support the need for improved representation of O3 impacts in models of carbon cycling in tropical forests.
Keywords:
leaf mass per area (LMA)
O3-dose response functions
ozone (O3)
plant mass per unit leaf area (PMA)
total antioxidant capacity (TAC)
water-use efficiency (iWUE)
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