shoreward zonation

The former one which is called sourceward zonation which is related with erosional datum plane of river, while the latter one called shoreward zonation which reflects the interrelation between vegetations and the moisture.
前者與河流的侵蝕基準麪有關，稱爲“溯源成帶性”；後者則反映植被與水分的關系，稱爲“岸帶成帶性”。