I've had a die off of the pinyon pine trees on my small lot, from bark beetles, and have lost about half of them. It's been a big job to clear them out. During that I've noticed that they are more likely to survive when closely paired with the other common tree in the area, a shaggy bark juniper. The junipers are resistant to the beetles and seem to bestow some of that on nearby pines.

It was 50/50 pine/juniper, now it's around 25/75, all due to loses in pine. Without the juniper the loss could have been another half as much pine. So my yard is an example of multiple species resulting in more carbon capture.