A PRIMARY STUDY ON IONIC MATERIAL MOVEMENT WITH DIFFERENT VEGETATION ─With an Example of Niujiatong Small Catchment, Guangdong Province

Choosing three types of geo-ecosystem, forest slope, semi-forest slope and bare slope in a small catchment, an experimental study on ionic material movement is carried out. Results show that the loss of ionic material depends on flow dynamic characteristics and chemical properties of the land background. The weight of the former is more than that of the latter. The sequence of the loss amount of ionic material is the bare slope, the semi-forest slope and the forest slope.