Journal
FORESTS
Volume 13, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/f13060897
Keywords
litter humification; humus accumulation; reduced snow cover; alpine forest
Categories
Funding
- National Natural Science Foundation of China [32001965, 41971261]
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This study assessed humus accumulations in five foliar litters during decomposition and found that fresh litter had a high humus content, which consistently increased during decomposition. The accumulation of humic acid played a key role in this process. Additionally, the study found that reduced snow cover affected humus accumulation differently at different stages of decomposition, suggesting the sensitivity of this process to changing climate in seasonally snow-covered ecosystems.
While carbon loss from plant litter is well understood, the mechanisms by which this carbon is sequestered in the decomposing litter substrate remains unclear. Here we assessed humus accumulations in five foliar litters during four years of decomposition and their responses to reduced snow cover in an alpine forest. In contrast to the traditional understanding (i.e., the three-stage model), we found that fresh litter had a high humus content (8-13% across species), which consistently increased during litter decomposition and such an increase primarily depended on the accumulation of humic acid. Further, reduced snow cover decreased humus accumulation at early stages but increased it at late stages. These results suggested that humification simultaneously occurred with decomposition during early litter decay, but this process was more sensitive to the changing climate in seasonally snow-covered ecosystems, as previously expected.
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