Paul Nolan received the award for services to forestry.
His work with the network, which Cheshire West and Chester Council created in partnership with several other local authorities, has seen almost 2.5 million trees planted across the county.
Mr Nolan said: “I’m starting to realise just how many people have been involved in the nomination process – and how well they’ve kept it a secret, including colleagues from Cheshire West and Chester Council!
“I’ve been really lucky to work with some fantastic people to help create The Mersey Forest.
“I am surprised and delighted. It’s great that the work of The Mersey Forest team and partners has been recognised in this way.”