Quantitative evaluation of the early humification processes of plant litters on Japanese forest floors.

点击翻译按钮获取中文摘要

To quantitatively clarify the organic carbon accumulation processes on the forest floor during an early stage of humification in various forests, solid-state^<13>C cross polarization magic angle spinning nuclear magnetic resonance (CPMAS NMR) signals were monitored for phased-humified litters of 6-species and soil surface horizons at 6 forest sites, determined the compositional changes during litter decomposition, and compared decomposition rates 'k (year-1)' of the respective carbons with whole litters. The k values of litter mass were quite constant (0.41±0.03), but the k values of carbon components, especially aliphatics and aromatics, varied among species. Namely, the present results suggested that processes of increment of litter recalcitrant might differ among the forest types although mass loss rate of whole litter mass with the humification did not differed among the forest types. These findings are helpful for detecting the influence of prospective global climate change in detrial carbon stocks in soils throughout Japan.