Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
How many tree species are there when the total plant species is 113?

### Inputs:
table_name: table, columns: ['Central Forest Reserve', 'Size in km²', 'Total plant species', 'Tree species', 'Endemic', 'Threatened (CR,VU,EN)']

### Response:
SELECT COUNT Tree species FROM table WHERE Total plant species = 113