Abstract:
The resources which plant can absorb from environment is limited.To avoid be eaten,plant have evolved kinds of defense,include structural defense and chemical defense.So we wonder if there is some relations between these defenses.In this paper,we quantificational analyzed the characters of chemical and structural defense of 11 species in castanopsis, and we found that there is trade-offs between structural and chemical defense indeed.That means, while resources on chemical defense go up, the structural defense is decrease,and there is a negative correlation between them,the trade-offs do exist.On the other hand, different species choose different defense strategy.Some species choose structural defense,like castanopsis delav;other species choose chemical defense,like Castanopsis sclerophylla and Castanopsis fissa.According to this difference,we think that we should reconsider some species taxonomic categories in castanopsis.