![[PukiWiki]](image/pukiwiki.png "[PukiWiki]")
In various regions in the world, forest decline has occurred; We have examined the causes of forest declining symptom. Recently, mountain birch (Betula ermanii) forest shows apparently decline symptoms at Lake Mashu in Hokkaido. In order to conserve the landscape of Lake Mashu, we should reveal the cause of forest decline of mountain birch forest. For this objective, we have been studying on the air quality at around Lake Mashu: i.e. acid mist and troposphere ozone condition. However, we did not examine the soil condition and differences of landform there in relation to forest decline. Therefore, I would like to reveal the relationship between declining birch trees and soil condition and/or difference in landform under changing climate condition.
