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Jill Butler, of the Woodland Trust, says the Olympics could damage the park without actually meaning to.
British Standards guidance recommends against any kind of construction, even tracks or paths, within up to 15 metres of a veteran tree.
"The majority of roots are in the top 30 centimetres of the soil," she said.
"Lots of horses going across them could cause significant change, and the older the tree, the less it may be able to respond."
The other difficulty with many of the trees is that even if their trunks are more than five metres apart, their branches are too low for a horse and rider to pass beneath.
Ms Jevans admitted some "pruning" would be needed With an old tree, according to Jill Butler, that is a potentially lethal operation.