To investigate this effect, Clements and his team placed screens over small segments of a dozen mountain streams to block ultraviolet light, and left them there for 60 days.

Under the effect of regional tectonics there develop many raws drape anticline and active fault in the front of mountain and they have especial motion fashion.

All of the differences were results of vegetational and climatic differences determined by the topography of the Ailao Mountain and the effect of the southwest monsoon.