Research advance in the effects of litter input on forest soil organic carbon transformation and stability

doi:10.13287/j.1001-9332.202409.033

Abstract

Abstract: The turnover and stabilization of soil organic carbon are tightly associated with the properties of litter input. Due to the complexity of litter decomposition and the high heterogeneity of forest soils, there are considerable uncertainties about how soil minerals, microorganisms, and environmental factors jointly regulate the transformation and stability of litter-derived soil organic carbon. Here, we present an overview of the “microbial efficiency-matrix stabilization” framework centered on microbial metabolism and organic carbon transformation, as well as the new “microbial carbon pump” and “mineral carbon pump” theories in forest soil organic carbon transformation and stabilization. We specifically highlighted a differential mechanism of “organo-organic interfaces” from the “organo-mineral interfaces” in the effects on soil organic carbon accumulation. We further expounded the transformation processes and stability of soil organic carbon based on the “carbon material cycling” and “energy fluxes”, aiming to provide theoretical support for the research on carbon sequestration in forest soils.

Key words: litter quality, litter quantity, root carbon, soil carbon fractions, litter derived carbon, microbe derived carbon, microbial carbon pump, mineral carbon pump

GUO Xiaowei, ZHANG Yuxue, YOU Yeming, SUN Jianxin. Research advance in the effects of litter input on forest soil organic carbon transformation and stability[J]. Chinese Journal of Applied Ecology, 2024, 35(9): 2352-2361.

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