The bark and branching resemble a mulberry, but the wood color is a bit off. Since that area appears decayed, I'm not certain what it might be. Mulberry leaves are yellow when they fall, so your background might match the leaf color too. I seldom see a broken mulberry, so that doesn't bode well for my diagnosis.
Are you able to scrounge around in the leaves and come up with some good samples? That is a lot more reliable than a picture of a tree trunk.