Suitable trees are trees which provide heights and ages that can be validly used to estimate site index.
(Suitable trees; are; trees which provide heights and ages) (trees; provide; heights and ages that can be validly used to estimate site index) (heights and ages; can be validly used; to estimate site index)
Suitable trees trees heights and ages
are provide can be validly used
trees which provide heights and ages
heights and ages that can be validly used to estimate site index
to estimate site index