AI Article Synopsis
- - The study highlights the significant role of sunlight, particularly blue light, in accelerating litter decomposition in temperate deciduous forests, finding a 120% increase in decay rates when exposed to full sunlight.
- - Researchers discovered that photodegradation led to a 13% loss of carbon from leaf-litter in areas with about 20% sunlight gaps over one year, showcasing its substantial impact on carbon cycling.
- - The research also indicates that different types of litter (herbaceous and shrub) decompose faster than tree litter, with the composition of the litter itself influencing how effectively it is broken down by sunlight.
Article Abstract
Litter decomposition determines carbon (C) backflow to the atmosphere and ecosystem nutrient cycling. Although sunlight provides the indispensable energy for terrestrial biogeochemical processes, the role of photodegradation in decomposition has been relatively neglected in productive mesic ecosystems. To quantify the effects of this variation, we conducted a factorial experiment in the understorey of a temperate deciduous forest and an adjacent gap, using spectral-attenuation-filter treatments. Exposure to the full spectrum of sunlight increased decay rates by nearly 120% and the effect of blue light contributed 75% of this increase. Scaled-up to the whole forest ecosystem, this translates to 13% loss of leaf-litter C through photodegradation over the year of our study for a scenario of 20% gap. Irrespective of the spectral composition, herbaceous and shrub litter lost mass faster than tree litter, with photodegradation contributing the most to surface litter decomposition in forest canopy gaps. Across species, the initial litter lignin and polyphenolic contents predicted photodegradation by blue light and ultraviolet B (UV-B) radiation, respectively. We concluded that photodegradation, modulated by litter quality, is an important driver of decomposition, not just in arid areas, but also in mesic ecosystems such as temperate deciduous forests following gap opening.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7898645 | PMC |
| http://dx.doi.org/10.1111/nph.17022 | DOI Listing |
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