Perhaps you should try some spelling variations:
decrease tree » decrease treg (Expand search), decrease the (Expand search), decrease their (Expand search)
decrease toc » decrease of (Expand search), decrease the (Expand search), decreased to (Expand search)
toc decrease » to decrease (Expand search), the decrease (Expand search), not decrease (Expand search)
decrease any » decrease and (Expand search), decreases and (Expand search), decreased and (Expand search)
any decrease » and decrease (Expand search), can decrease (Expand search), may decrease (Expand search)
tree effects » allee effects (Expand search), edge effects (Expand search), age effects (Expand search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: (( decrease toc decrease AND decrease ) OR ( decrease any decrease tree effects ))~.