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.
前者与河流的侵蚀基准面有关，称为“溯源成带性”；后者则反映植被与水分的关系，称为“岸带成带性”。