This paper studied the correlations among the main leaf functional traits in tree species in Davidia involucrate communities at the Houhe Nature Reserve in Hubei.The main leaf functional traits were compared between D.involucrata and other dominant trees by age classes [first class(dbh<2.5 cm),second class(dbh=2.5 22.5 cm)and third class(dbh>22.5 cm)].Results showed that specific leaf area(SLA) had significantly negative correlations with both the mass-based(CCm) and area-based(CCa) leaf construction cost(p<0.01).A higher SLA and mass-based leaf nitrogen concentration(Nmass) but lower CCm,CCa,and area-based leaf nitrogen concentration(Narea) were found in D.involucrate as compared with other tree species,suggesting a more efficient capture of limiting resources in D.involucrate than in other species.Maximum rate of photosynthesis(Amax),dark respiration rate(Rd),light compensation point(LCP),and light saturation point(LSP) were all ranked in the order of third class > second class > first class,but SLA showed a reverse sequence(p<0.05).Results in this study suggest that D.involucrata has a flexible light-adaptation strategy in its early growth phase as first class under the shade,but becomes shade-intolerant when growing into second class.Light limitation is likely one of the major constraints in population growth of D.involucrate.
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