Changes of Stream Water Chemistry After Clear Cutting Using Forest Rotation

It is well known that clear-cutting has a large impact on stream water chemistry. There are many studies about the influences of the clear-cutting. These results have showed that nitrate concentration increases, pH decreases and increases of peak drainage etc. These qualitative influences are common, but it is still unclear the quantitatively. Our watershed including more than 50 small watersheds, they are managed using forest rotation in a unit of watershed. It results that the watershed is useful for the chronosequence study. We introduce the preliminary results of stream water chemistry after clear-cutting until 87 years and discuss the qualitative repeatability of the influences.