Figure legends
FIGURE 1 (a ) Location of the study site in
Jianfengling Nature Reserve (18°53′N, 108°43′E) on Hainan Island, China.
(b ) Field experiment set up showing an open-top chamber (OTC)
and the treatment layout within an OTC. The experimental unit consisted
of two columns of six 40×40 cm quadrats. One column was randomly
selected to spray pesticides (Celest Gold and Ridomil Gold) for
inhibiting soil-borne pathogens that cause seedling damping-off. The
other column was sprayed with the same volume of distilled water. Tree
species marked with “**” were the two focal species, Ormosia
semicastrata f. litchiifolia and Cyclobalanopsis
patelliormis . Their respective congeneric species, O. pinnataand C. hui , were used to test the host specificity of soil-borne
pathogens. (c ) Warming magnitude of the OTCs (monthly mean
temperatures with 95% bootstrapped confidence intervals), indicating
the difference between the soil temperature in the OTCs and the soil
temperature in the paired control plots. The horizontal dotted line
denotes mean value of the OTC warming magnitude over the three-year
field experiment (0.89 °C).
FIGURE 2 Hazard ratios (relative risk) of seedling mortality ofOrmosia semicastrata f. litchiifolia (a ) andCyclobalanopsis patelliformis (b ). The effects of three
factors (distance to the parent tree, with pesticides versuswithout pesticides, and OTC warming versus control) on seedling
mortality were based on hazard models for modelling seedling survival
times by the end of the three-year field experiment. A hazard ratio
larger than one indicates an increased hazard of seedling mortality
under a treatment versus control (i.e., the baseline reference).n is the number of seedlings per treatment.