No, I don't think Lightroom can. I used Paint Shop Pro X2, using the magic wand selection tool on the leaves on the color version, and copied that to the b&w version. It's tedious to do, but not difficult. There may be an easier way... some sort of automated process, but I don't know what that would be.

Maybe after selecting the leaves just reverse the selection or select the floor instead of leaves and then make it b&w? I do so in GIMP, it works fine, and you won't need to care about setting it in right place after copying.
And this is an awesome photo. Both this and original version.

siriwan, that would have been a good idea. I'll keep it in mind next time. Thanks for the suggestion, and I'm glad you like the photos. :)

Thanks, jeremy. I like this one better, too.