气候变化领域集成服务门户(CCPortal): Signatures of an abiotic decomposition pathway in temperate forest leaf litter

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DOI	10.1007/s10533-021-00777-9
	Signatures of an abiotic decomposition pathway in temperate forest leaf litter
	Keiser A.D.; Warren R.; Filley T.; Bradford M.A.
发表日期	2021
ISSN	1682563
起始页码	177
结束页码	190
卷号	153 期号:2
英文摘要	Photodegradation helps explain why leaf litter mass loss rates are comparable between mesic environments and drylands, despite water availability limiting decomposer activity in drylands. With photodegradation, light energy directly mineralizes photoreactive organic molecules such as lignin, which contrasts with biotically-driven decomposition where lignin persists in decomposing leaf litter relative to other compounds. Photodegradation of leaf litter has largely been studied in dryland systems, but whether it occurs in mesic, deciduous forest systems is uncertain. As such, we examined potential photodegradation in maple and oak litter in the Southern Appalachian Mountains (USA) during the non-growing season, when newly fallen leaves are exposed to maximum solar radiation without deciduous canopies. The proportion of oxidized lignin in the leaf litter relative to other carbon compounds decreased with maximum solar radiation during the non-growing season. With a closed canopy, however, the proportion of total lignin relative to other compounds in the leaves increased. This pattern was particularly strong for the syringyl- S6 and guaiacyl-G6 lignin monomers. The relative proportion of S6 and G6 in the litters was reduced by 10–65% in the first 5 months. The largest reductions in lignin occurred on south-facing mountain slopes where solar radiation was highest (relative to north-facing slopes) in the Northern Hemisphere. Overall, however, the changes in lignin did not alter cumulative litter mass lost. Our results suggest that photodegradation promotes the transformation and relative loss of lignin in the early stages of litter decomposition in mesic deciduous forests. © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG.
英文关键词	Abiotic decomposition; Decomposition; Leaf litter; Lignin; Photodegradation; Temperate forest
语种	英语
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184614
作者单位	Stockbridge School of Agriculture, Paige Lab Room 311, University of Massachusetts, 161 Holdsworth Way, Amherst, MA 01003, United States; Department of Biology, Buffalo State College, Buffalo, NY 14222, United States; Department of Earth, Atmospheric and Planetary Sciences, Purdue University, West Lafayette, IN 47907, United States; School of Forests, Yale School of the Environment, Yale University, New Haven, CT 06511, United States
推荐引用方式 GB/T 7714	Keiser A.D.,Warren R.,Filley T.,et al. Signatures of an abiotic decomposition pathway in temperate forest leaf litter[J],2021,153(2).
APA	Keiser A.D.,Warren R.,Filley T.,&Bradford M.A..(2021).Signatures of an abiotic decomposition pathway in temperate forest leaf litter.Biogeochemistry,153(2).
MLA	Keiser A.D.,et al."Signatures of an abiotic decomposition pathway in temperate forest leaf litter".Biogeochemistry 153.2(2021).