The Loess Plateau is known as a famous climate-sensitive zone and a fragile ecological environmental belt in China. A variety of environmental factors, such as soil type, geographic location, climate, etc. , constrain the accumulation of soil organic matter in this region. Thus, quantifying the spatial distribution of soil organic carbon (SOC) and its fraction is significant for better understanding on soil carbon cycle across the Loess Plateau region. Soil humus, as the major soil organic matter component, is a key indicator for the soil quality and fertility. Yet, the distribution characteristics of soil humus and its fractions across the Loess Plateau have been paid little attention and still remain big uncertainty. In this study, we characterized the vertical distribution of humus and its fractions including Humic Acid (HA) and Fulvic Acid (FA) in the 0-200 cm soil profile along south-north gradient in the Loess Plateau. Then, we further explored the correlations among soil humus, HA, FA, soil total nitrogen, and soil particle composition. An intensive field campaign was

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