Analysis of changes of soil vertical zonaliy and dynamics of soil organic carbon with global warming

研究了北海道Rishiri岛Sasa kurilensis草原、Abies sachaliuensis森林和Pious pumila灌丛下的火山灰土壤。研究了气候和植被对土壤剖面特征和土壤化学性质的影响。黑龙土（安藤土）分布在莎莎草原下缓坡坡冲积扇上。在利实里山缓坡上，在矮松灌丛下发现了灰化土。峰顶缓坡上分布着阿尔卑斯岩石层。土壤样品的pH值随海拔升高而降低。这表明，在利尻山的高海拔地区，土壤有机碳几乎没有被分解。下层土壤样品中Alp与全碳的相关性高于表层土壤样品。这表明土壤有机碳不与铝或铁络合。

We investigated volcanic ash soils under the Sasa kurilensis grasslands, Abies sachaliuensis forests and Pious pumila scrubs at Rishiri Island, Hokkaido. And we examined the effects of climate and vegetation on the characteristics of soil profiles and chemical properties of soils.Kuroboku soils (Ando soils) were distributed on alluvial fan of gentle foot slope under the Sasa grassland. Under the Pinus pumila scrubs, Podzolized soils were observed on gentle mountain side slope at Mt. Rishiri. On gentle slope on summit at Mt. Rishiri, Alpine Lithosols were distributed.pH values of soil samples were decreased with elevation. It suggested that soil organic carbon was little decomposed under the high altitude site, at Mt. Rishiri. The correlation between Alp and total carbon in subsoil samples was higher than those in soil samples of surface horizons. These suggested that soil organic carbon didn't complex with alminum or iron.