Why has the National Forest Commission of India recommended a relatively larger forest cover for hills than for plains?

In order to prevent soil erosion, to facilitate percolation and recharging of ground water, to maintain flora and fauna and to avoid landslides and other natural calamities, the National Forest Commission of India(1988) recommended a relatively larger forest cover for hills(67%) than for plains(33%).

Forests are very important for the survival of the mankind. It’s not only our moral duty but also the need of the hour to restore as much forests as we can, in order to survive and live a better life.