Active soil organic matter (ASOM) is an important soil component, influencing dissolved organic carbon (DOC), microbial biomass (MB), and light fraction organic matter (LOM). In particular, soil organic matter (SOM) affects short-term nutrient turnover and is responsible for temporary stability of soil structure. ASOM is a major component of biochemical cycles of nutrient elements such as N, P, S, and both its quality and quantity reflect and control primary productivity. ASOM has been proposed as a sensiti...