The trust commissioned the study to gauge whether it should be doing more to protect green places from development. The findings show that many people are missing regular contact with the natural world in their daily lives, it said.
"The public has told us that the trust should work with communities to protect and look after their green spaces," said chairman Sir William Proby.
"They also want us to share our experience with councils and other partners to improve the quality of green places on people's doorsteps. This will be the approach we take."