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In resprouting species, fire-induced topkill causes a reduction in height and leaf area without a comparable reduction in the size of the root system, which should lead to an increase in the efficiency of water transport after fire. However, large plants undergo a greater relative reduction in size, compared with small plants, so we hypothesized that this enhancement in hydraulic efficiency would be greatest among large growth forms. In the ecotone between long-leaf pine ( Pinus palustris  Mill.) savannas and wetlands, we measured stomatal conductance ( g  s ), mid-day leaf water potential ( Ψ  leaf ), leaf-specific whole-plant hydraulic conductance ( K  L.p ), leaf area and height of 10 species covering a range of growth forms in burned and unburned sites. As predicted,  K  L.p  was higher in post-fire resprouts than in unburned plants, and the post-fire increase in  K  L.p  was positively related to plant size. Specifically, large-statured species tended to undergo the greatest relative reductions in leaf area and height, and correspondingly experienced the greatest increases in  K  L.p . The post-fire increase in  K  L.p  was smaller than expected, however, due to a decrease in absolute root hydraulic conductance (i.e., not scaled to leaf area). The higher  K  L.p  in burned sites was manifested as an increase in  g  s  rather than an increase in  Ψ  leaf . Post-fire increases in  g  s  should promote high rates of photosynthesis for recovery of carbohydrate reserves and aboveground biomass, which is particularly important for large-statured species that require more time to recover their pre-fire size.

Size-dependent enhancement of water relations during post-fire resprouting