Abstract：[Background] Topsoil in the black soil region of Northeast China has become thinner since cultivation, soil degradation has become more and more serious and been causing soil organic matter content to decrease gradually. Soil erosion is the key contribution to soil degradation. The loss of organic carbon in the black soil region of Northeast China has not only been affected by water erosion, but also by tillage erosion. Further exploring the responses of soil organic carbon within different sizes of aggregates to two types of erosion, and determining the predominant type of erosion driving aggregates-associated organic carbon loss in the black soil region could provide evidences for mechanisms of soil erosion and soil loss and soil quality degradation in the black soil region.[Methods] Based on the surface soil of natural secondary forest which has not been undisturbed by reclamation in the northeastern China, the responses of aggregates-associated organic carbon were studied by simulated tillage erosion (in-situ disruption and tillage migration) and water erosion (raindrop splash and runoff scouring) with different interference intensities. The treatment intensities were 5, 10, 20, 30, 40 times for in-situ disruption; 5, 20, 30, 40 times for tillage migration; 40, 60, 80, 100, 120 mm/h for raindrop splash; as well as 2, 3, 4, 5, 6 L/min for runoff scouring respectively. After simulating, soils from the 0-1 cm surface were collected and incubated for 30 d. Soils after incubation were wet-sieved into >2 mm, 1-2 mm, 0.25-1 mm, 0.053-0.25 mm,<0.053 mm fractions, and then determined the organic carbon content.[Results] After in-situ disruption, soil organic carbon content of >0.25 mm and <0.25 mm aggregates increased and decreased with the increasing interference intensity, respectively. During tillage migration, the organic carbon content of >0.053 mm aggregates increased and <0.053 mm aggregates decreased, respectively. The impact of raindrop splash on organic carbon content of aggregates with different sizes showed a generally increasing trend; however, runoff scouring increased the organic carbon content of >0.25 mm aggregates and decreased the organic carbon content of <0.25 mm aggregates. The change rate of organic carbon content merely in >2 mm, 1-2 mm, 0.053-0.25 mm aggregates was negatively correlated with tillage erosion intensity.[Conclusions] Compared with water erosion, the response of aggregates-associated organic carbon to tillage erosion is more sensitive. Tillage erosion may predominate in the loss of soil organic carbon in the farmland of black soil region of Northeast China. The findings have confirmed the existence and significance of tillage erosion.
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YIN Shuang, LI Yiran, LI Lu, CAO Wei, WANG Enheng. Different responses of aggregates-associated organic carbon to tillage and water erosion in the black soil region. SSWC, 2020, 18(3): 67-73.
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2020, Vol. 18 
