Bache Hill and the Whimble 1
Image by GLADMAN

ask a stupid question, it's not just to protect the barrow by stopping the tree growing into it (I can't quite work out how near it is), or to bring some sunlight to it, opening the canopy?

Cutting a cross into the stump would surely be to help it rot, I'm sure that's quite normal isn't it?

are they fir trees? I know in deciduous woods it's good to keep rotting wood piles for the benefit of Creatures, could that be the motivation?

sorry if this all sounds unlikely to you, it's only me making suggestions while not being able to visualise the scene so well.

From what I can gather the trees are quite a long way down from the barrows - if you look at the pictures the top of Bache Hill where the barrows are is open heath.

But also it sounds like the person doing the chopping isn't the landowner.