Review test

What is the globally common, best climatic correlate with treeline position?

List at least 3 examples of factors which can locally overrun the global treeline determinant.

Imagine a bright midsummer day. Which experiences warmer climate? A tree at the treeline or alpine grassland 200 m above the treeline?

Do you think treelines would be found at higher elevations than they are if leaf photosynthesis were more intensive?

Can you imagine experimental ways of testing the current theory of treeline formation as presented here?