ISWC OpenIR  > 水保所2018--届毕业生论文
Modeling Soil Organic Carbon Loss in Relation to Flow Velocity and Slope on the Loess Plateau of China
Li, Zhongwu1,2; Liu, Lin1; Nie, Xiaodong1,2; Chang, Xiaofeng1; Liu, Chun1,2; Xiao, Haibing1
2016-10
Source PublicationSoil Science Society of America Journal
ISSN0361-5995
Volume80Issue:5Pages:1341-1351
Abstract
Soil organic C (SOC) loss is usually estimated in relation to sediment loss in the long term and at a large scale. Further studies on building a simple SOC prediction model for individual rainfall events are thus needed. Simulated rainfall experiments were conducted under two rainfall intensities (90 and 120 mm h−1) and four typical slope gradients (10, 15, 20, and 25°). Two types of soils (Suide and Changwu) with different textures were selected. Results showed that total sediment loss and SOC loss are correlated and that this correlation is particularly significant under lower organic C content (P < 0.01). The SOC enrichment ratio was high under 90 mm h−1 rainfall intensity and increased further by a low slope under interrill erosion. The relationship between average flow velocity and average sediment concentration for the Suide soil could be regressed with a linear function (R2 > 0.94), and the relationship between slope and runoff could be modeled with a quadratic function (R2 > 0.94). For the Changwu soil, both sediment concentration and runoff showed significant relationships with slope (P < 0.05). Soil organic C loss can be predicted simply by flow velocity, slope, SOC content, and SOC enrichment ratio. The prediction accuracy of the model was improved when the rainfall intensity was low. The results of this study can serve as a reference in enhancing the accuracy of SOC loss prediction.
KeywordContour Ridging Systems Southern China Erosion Processes Water Erosion Land-use Simulated Rainfall Steep Slopes Rill Erosion Red Soil Runoff
DOI10.2136/sssaj2016.03.0092
Indexed BySCI
Funding OrganizationThis study was financially supported by the “Hundred-Talent Project” of the Chinese Academy of Sciences and the National Natural Science Foundation of China (41271294).
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Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8156
Collection水保所2018--届毕业生论文
Affiliation1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, CAS and MWR, Yangling, Shaanxi Province 712100, PR China
2.College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China
Recommended Citation
GB/T 7714
Li, Zhongwu,Liu, Lin,Nie, Xiaodong,et al. Modeling Soil Organic Carbon Loss in Relation to Flow Velocity and Slope on the Loess Plateau of China[J]. Soil Science Society of America Journal,2016,80(5):1341-1351.
APA Li, Zhongwu,Liu, Lin,Nie, Xiaodong,Chang, Xiaofeng,Liu, Chun,&Xiao, Haibing.(2016).Modeling Soil Organic Carbon Loss in Relation to Flow Velocity and Slope on the Loess Plateau of China.Soil Science Society of America Journal,80(5),1341-1351.
MLA Li, Zhongwu,et al."Modeling Soil Organic Carbon Loss in Relation to Flow Velocity and Slope on the Loess Plateau of China".Soil Science Society of America Journal 80.5(2016):1341-1351.
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