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| Spatial Variations in Soil Organic Carbon Density Under Different Restoration Practices in Loess Hilly-gully Region |
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| KeyWord:soil organic carbon density; small watershed; spatial variation; conversion of cropland into grassland or woodland; loess hilly-gully region |
| Author Name | Affiliation | | LI Jun-chao | College of Resources and Environment, Northwest A&F University, Yangling 712100, China | | GUO Sheng-li | College of Resources and Environment, Northwest A&F University, Yangling 712100, China
Institute of Soil and Water Conservation, Northwest A&F University , Yangling 712100, China
Institute of Soil and Water Conservation, CAS & MWR, Yangling 712100, China | | DANG Ting-hui | College of Resources and Environment, Northwest A&F University, Yangling 712100, China
Institute of Soil and Water Conservation, Northwest A&F University , Yangling 712100, China
Institute of Soil and Water Conservation, CAS & MWR, Yangling 712100, China | | ZHANG Yan-jun | Institute of Soil and Water Conservation, Northwest A&F University , Yangling 712100, China | | LI Na-na | Institute of Soil and Water Conservation, Northwest A&F University , Yangling 712100, China |
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| Abstract: |
| Studying spatial variation of soil organic carbon density（SOCD） is helpful for exploring the mechanisms of carbon sequestration under different restoration practices in the Loess Plateau. Wufendigou, Zhuanyaogou, and Yangou watersheds were selected across the hilly-gully region of Loess Plateau from North to South. Changes in SOCD in these three watersheds were analyzed during conversion of cropland into grassland and woodland. In the same watershed, SOCD was higher in woodland and grassland than in sloping farmland, and greater in surface（0~10 cm） than in subsurface（10~20 cm）（P<0.05）. Under the same land use, SOCD showed significant spatial distribution（P<0.05） among three watersheds. From North to South, SOCD changed from 0.54 kg·m-2 to 0.56 kg·m-2, and to 0.61 kg·m-2 for sloping farmland, from 0.64 kg·m-2, to 0.90 kg·m-2 and to 1.05 kg·m-2 for woodland, and from 0.71 kg·m-2, to 0.67 kg·m-2 and to 0.73 kg·m-2 for grassland. Compared to the sloping farmland, percent increase in SOCD caused by converting cropland into woodland or grassland had spatial variations from North to South. In woodland, the percentage was 18.8% in Wufendigou watershed to 72.7% in Yangou watershed, whereas in grassland it ranged from 32.1%（North） to 20.1%（South）. Our results indicate that SOCD is closely related with climate conditions, biological factor（the fine-root biomass）, soil properties and soil erosion intensity in hilly-gully region of the Loess Plateau. |
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