Chemical changes with water migration in a forest ecosystem

Summary

On the basis of the data observed in the Tsukuba experimental forest, this paper described the chemical change with the water migration and the element cycle in the forest ecosystem. With respect to the essential elements for the forest plant growth, an abundance of the elements is stocked in the forest soil, and to say about the nitrogen as an example the forest soil holds the amounts necessary to preserve the forest ecosystem as long as about seven hundred years.

Besides, more than 70% of the annual uptake amount by the plant turn back to the forest floor through the throughfall, stemflow and litterfall. This value counts for 5 times larger at least than the annual input by the rainfall. The considerable large amount of the elements cycling in the forest ecosystem results in changing the element content in the forest soil, and this element content in soil gives rise to the production of the vertical profile of the soilwater chemistry peculiar to the forest ecosystem.