Estimating soil organic carbon storage and distribution in a catchment of Loess Plateau, China

土壤碳 环境科学 林地 草原 风积作用 水文学(农业) 土壤科学 灌木 黄土 土壤水分 地质学 农学 地貌学 生态学 岩土工程 生物
作者
Fengpeng Han,Wei Hu,Jiyong Zheng,Feng Du,Xingchang Zhang
出处
期刊:Geoderma [Elsevier BV]
卷期号:154 (3-4): 261-266 被引量:111
标识
DOI:10.1016/j.geoderma.2009.10.011
摘要

Using soil as a carbon sink to sequester carbon dioxide has attracted much attention. But there is little research on soil organic carbon (SOC) in the Loess Plateau because of the extremely complex topography. In this study, SOC storage was estimated based on a soil survey of a small catchment in the Loess Plateau, northwest China. The SOC content of 169 profiles and the bulk density of 12 profiles were measured. The study area was classified into six different classes: farmland, grassland, shrub land, woodland, gully, Aeolian sandy soil. Results showed that the soil bulk density and SOC content are affected by land use and soil types, and the relationship between them could be expressed by a power function. Grassland had the highest SOC density, and next came farmland. Gully and Aeolian sandy soil had the lowest SOC density. The SOC content per area in the grassland and farmland was higher than the other classes and the shrub land was similar to the woodland while the Aeolian sandy soil and gully were the lowest. All of the changes in the cumulative SOC storage with the increasing depth follows a logarithmic model. The SOC storage in the catchment of farmland, grassland, shrub land, woodland, gully, and Aeolian sandy soil was estimated as 3.32 × 106 kg, 9.45 × 106 kg, 1.023 × 107 kg, 2.73 × 106 kg, 5.76 × 106 kg, and 2.94 × 106 kg, respectively. The total SOC storage of 100 cm depth in the catchment is 3.443 × 107 kg.
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