Describe the relationship between bird species richness and tree species richness

Species richness is related to the number of species living in a particular community. More the number of species present in a community more will be its species richness.  

Trees provide the natural habitat for most of the birds living in this world so a higher tree species richness can provide a wide range of natural habitat for bird species.

Different species of birds rely on different source of food to reduce competition so a high species richness of trees can provide a different source of food which can support high species richness of birds.

Therefore there is a positive relationship between bird species richness and tree species richness.  

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