explain why there is a decease in gross productivity as the woodland matures?
You have no idea whatsoever?
Think about it. At the peak of gross productivity, you have the climax species which is usually large trees.
However, climax community hasn't reached yet. You've got all these large trees that have finally grown. What's going to happen to all those littler plants and shrubs at the forest floor?
Think about it. At the peak of gross productivity, you have the climax species which is usually large trees.
However, climax community hasn't reached yet. You've got all these large trees that have finally grown. What's going to happen to all those littler plants and shrubs at the forest floor?