This is an old tatami mat wrapped around a tree. Tatami or woven straw mats are used for flooring. The green silk "ribbon" was the border around the mat when it was on the floor. Straw mats are sold for garden purposes, but this farmer is recycling an old tatami mat.
I posted a picture last year of another tree with a garden mat around it. The farmers are trying to catch bugs. They will dispose of or burn the mat.
