期刊
NEW PHYTOLOGIST
卷 229, 期 5, 页码 2625-2636出版社
WILEY
DOI: 10.1111/nph.17022
关键词
biogeochemical cycle; functional traits; mesic ecosystems; model simulation; ultraviolet radiation
资金
- Japan Society for the Promotion of Science (JSPS), Japan
- KAKENHI [17F17403, 17H03736]
- Environment Research and Technology Development Fund of the Environmental Restoration and Conservation Agency of Japan [JPMEERF16S11506]
- CAS Young Talents Programme
- National Natural Science Foundation of China (NSFC) [41971148]
- CAS Youth Innovation Promotion Association [2019388]
- Yunnan Fundamental Research Projects of China [2018FB042]
- Academy of Finland [304519, 324555]
- Region 'Haute-Normandie' through the GRR-TERA SCALE (UFOSE Project)
- Grants-in-Aid for Scientific Research [17H03736, 17F17403] Funding Source: KAKEN
Sunlight plays a significant role in accelerating litter decomposition, with blue light contributing a large percentage to this process. Herbaceous and shrub litter decompose faster than tree litter, and the initial lignin and polyphenolic contents of the litter can predict the effects of blue light and ultraviolet B radiation on photodegradation.
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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