Minjiang valley is a fragile area in natural geography environment and forest ecological ecosystem according tolots of data of meteorology

geology

soil and hydrology

huge drop in topography

strong precipitation

easily eroded soil growing from granite

fragility to defend erosion in red soil area

water system of long handle sector and alternate with arrange canyon and basin vale benefit for collection water

and go against drain. The ability decline of defending soil and sluicing water

and hinder flood and flood detention for the degeneration of forest ecosystem. In consequent activity of people pick up water and soil loss

riverbed drive up

embankment fragility

ability of store flood water and row flood reduce. All of them make it snatur alcalamity (especially floodw ater) frequent .