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为掌握川西北高寒地区不同土壤类型碳储量的变化,选择了川西北红原县的3种典型土壤(亚高山草甸土、泥炭草甸土、冲积土)进行有机碳密度的垂直分布特征研究。结果表明:随土壤深度的增加,亚高山草甸土和冲积土的土壤有机碳密度降低;泥炭草甸土的有机碳密度在40～60 cm达到最大。整个土壤剖面(1 m)有机碳密度最高的是泥炭草甸土(72.06 kg/m~2),其次是冲积土(26.58 kg/m~2),最小的是亚高山草甸土(17.05 kg/m~2);冲积土、亚高山草甸土的表层土壤(0～20 cm)的有机碳密度分别占整个剖面的41%、58%,而泥炭草甸土的表层土壤(0～20 cm)的有机碳密度仅占整个剖面的15%。
In order to understand the changes of carbon storage in different soil types in the alpine region of northwest Sichuan, three typical soils (subalpine meadow soil, peat meadow soil and alluvial soil) in Hongyuan County, northwest of Sichuan Province were selected to study the vertical distribution of organic carbon density . The results showed that the soil organic carbon density of subalpine meadow soil and alluvial soil decreased with the increase of soil depth. The density of organic carbon in peat meadow soil reached the maximum at 40-60 cm. The highest organic carbon density in the soil profile was peat meadow soil (72.06 kg / m ~ 2), followed by alluvial soil (26.58 kg / m ~ 2) and the smallest was subalpine meadow soil (17.05 kg / m ~ 2). The organic carbon density of alluvial soil and subalpine meadow soil (0 ~ 20 cm) accounted for 41% and 58% of the total section, respectively, while that of peat meadow soil cm) has an organic carbon density of only 15% of the entire section.