Mr McReynolds made the comments as he hosted the launch of Woodland Trust's report into the role trees and woodland can play in nature's recovery.
The East Belfast MLA said trees and woodlands are "are essential components of our natural ecosystem" which create "nature-rich, resilient landscapes".
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In a statement, Mr McReynolds said:
"Our oldest trees are living legends and of incredible importance for wildlife, with each tree an ecosystem in its own right. But despite their importance, they are afforded less protection than our oldest buildings.
"That's why I have been working with the Woodland Trust to develop a PMB to strengthen protections for our existing trees and woodlands
"That will consist of a number of key areas, such as granting stronger legal protections for our oldest and most important trees, strengthening and enhancing tree protection orders, and protecting trees and ancient woodland from public and private bodies carrying out works under permitted development rights.
"If we don't protect trees, we are turning out backs on nature itself and the next generations coming after us. I hope my PMB will play a role in preventing that from happening."
