2011 Volume 79 Issue 6 Pages 449-455
In the cold Tokachi region of Hokkaido there is little snow accumulation, and the soil freezes or suffers from frost heaving. We planted a cut slope there with four indigenous herbaceous species and three indigenous woody species. The test started in September 2005. Thereafter, we maintained a follow-up survey on the percentage of vegetational cover and growth in the plant communities and the change in the composition of plant species until October 2009. The result of the survey shows that every year when the average daytime temperature is more than 5 ºC, indigenous herbaceous plants start budding and sprouting, and extend very rapidly showing more than 80 % of vegetational cover in July. As for the composition of plant species, we recognized mostly 2 species at the beginning. However, many species increased. We recognized this as a successional process. In October 2009 the existing ground coverage was 519-645 g·m-2.