A vegetation ecological study for the restoration and rehabilitation of green environment based on the creation of environmental protection forests in Japanese archipelago.

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The creation of environmental protection forests, which were planted by native tree species in potential natural vegetation with dense plantation (1-3 individuals par square meters), became 1-24 years old since 1972. This project from 1994 to 1996 based on Grand-In-Aid for Scientific Research were summarized in following :(1)Analyzing the growth data in 1994-1996, (2)Comparing environmental dynamics, (3)Comparing the restoration of species diversity, (4)Comparing with rehabilitation of natural forests and species diversity, and succession speed, (5)Establishing the methodology and theory of rehabilitation and restoration of the environmental protection forests and species diversity.(1)The growth rate showed that seedlings of canopy species of the evergreen broad-leaved forests grow 1m par year in first ten years and then make stems thick after ten years. Growth rates of planted seedlings on the slope are better than flat areas. And it was proved that the age of trees cannot be decided regularly from their height and diameters. The each individuals showed different growth rate within same age.(2)The methodological data was discused based on data. The environmental dynamics are small in forests, and big outside of forests (on the bare land).(3)In species diversity (richness), plants by ornithocory could get in planted forests easily. After dens plantation over ten species germinated from 4-5 years after plantation. Seedlings of Fagaceae species occurred in forests after eight years (from the example of environmental protection forests in Yokohama National University).(4)The plantation method, with dens plantation of potted seedlings from canopy species in potential natural forests, can be grow 50-80 years faster than natural succession.