Chronosequence study on organic carbon accumulation rate of forest soils in Japan

研究了大气火山灰沉积物和岩屑崩落沉积物森林土壤有机碳储量，以评价森林土壤近期碳积累速率。大气火山灰沉积物土壤的累积速率为0.01 ~ 0.05kgC·m ~（-1）·<-2>y ~（-1<-1>），泥石流沉积物土壤的累积速率为0.003 ~ 0.004kgC·m ~（-1）·<-2>y ~（-1）<-1>。前者的速率明显大于Schlesinger（1990）的速率，后者在北方、温带和热带森林中的范围为0.001 - 0.01 kgC m^<-2>y^<-1>。这些积累率之间的土壤差异是由于土壤质地，强烈影响了植物入侵和森林再生;火山灰沉积物具有较细的土壤质地比碎片雪崩沉积物。

Soil organic carbon stocks in forest soils derived from air-fall tephra deposits and debris avalanche deposits were studied to evaluate the recent soil carbon accumulation rate. The accumulation rates of soil derived from air-fall tephra deposits ranged from 0.01 to 0.05kgC m^<-2>y^<-1> and the rate of the soil derived from debris avalanche deposits ranged from 0.003 to 0.004kgC m^<-2>y^<-1>, respectively. The former rates were remarkably larger than the rates reviewed by Schlesinger(1990), which ranged from 0.001 to 0.01kgC m^<-2>y^<-1> at boreal, temperate and tropical forests. Difference of these accumulation rates between the soils was due to soil textures which strongly affected a plant invasion and forest regeneration ; the tephra deposits had finer soil texture than the debris avalanche deposits.