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[1]JIA Song-wei.Soil Organic Carbon Loss Under Different Slope Gradients in Loess Hilly Region[J].Research of Soil and Water Conservation,2009,16(02):30-33.

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Soil Organic Carbon Loss Under Different Slope Gradients in Loess Hilly Region

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 16 Number of periods: 2009 02 Page number: 30-33 Column: Public date: 2009-04-20

Title:: Soil Organic Carbon Loss Under Different Slope Gradients in Loess Hilly Region

Author(s):: JIA Song-wei; Institute of Economic and Management, He’nan University of Science and Technology, Luoyang, He’nan, 471003, China

Keywords:: soil erosion; soil organic carbon loss; slope gradient; carbon cycle

CLC:: S157;S153.61

DOI:: -

Abstract:: Based on field runoff plots observation and sample analysis,the effect of slope gradient on soil organic carbon loss was studied under natural rainfall conditions in loess hilly region.The results showed that with slope gradient increasing(from 10°to 30°),the changing trend of soil erosion intensity(A) was A_20°>A_30°>A_15°>A_10°>A_25°,suggesting that slope gradient between 20° and 25° was a critical degree ranger to exist.Soil organic carbon loss was mainly influenced by soil erosion intensity,appearing the same trend as did soil erosion intensity with increasing slope gradient.Soil erosion results in organic carbon enrichment in sediment.Average enrichment ratios of five runoff plots varied from 2.27 to 3.74,and decreased with increasing erosion intensity and slope gradient.Soil organic carbon loss was a power function with rainfall erosiveness index(PI₃₀).The decrease of surface runoff and soil erosion is the key to reduce soil organic carbon loss.

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