气候变化领域集成服务门户(CCPortal): The role of the understory in litter DOC and nutrient leaching in boreal forests

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DOI	10.1007/s10533-020-00668-5
	The role of the understory in litter DOC and nutrient leaching in boreal forests
	Hensgens G.; Laudon H.; Peichl M.; Gil I.A.; Zhou Q.; Berggren M.
发表日期	2020
ISSN	0168-2563
起始页码	87
结束页码	103
卷号	149 期号:1
英文摘要	Dissolved organic carbon (DOC) derived from plant litter plays an important role in the ecosystem carbon balance and soil biogeochemistry. However, in boreal coniferous forests no integrated understanding exists of how understory vegetation contributes to litter leaching of DOC, nitrogen (N) and phosphorus (P) with different bioavailability at the forest stand level. We characterized water extractable leachates from fresh and decayed litter of dominant canopy and understory sources in a boreal coniferous forest, in order to explore the contribution of understory vegetation as a source of both total and bioavailable forms of DOC, N and P. Recently produced litter from deciduous species (including Vaccinium myrtillus) yielded the highest amounts of DOC. However, this leaching potential decreased exponentially with mass loss through litter decay. The DOC lability generally showed little interspecific variation, although wood derived DOC was more recalcitrant. Lability decreased progressively with litter aging. Water extractable nutrients increased proportionally with DOC, and roughly a quarter (N) or half (P) had directly bioavailable inorganic forms. Scaled to annual litterfall at the forest stand, understory vegetation contributed ~ 80% of the water extractable DOC and nutrients from fresh litter, with > 60% coming from Vaccinium myrtillus alone. However, as litter decomposes, the data suggest a lower leaching potential is maintained with a larger contribution from needle, wood and moss litter. Our study shows that understory vegetation, especially V. myrtillus, is a key driver of litter DOC and nutrient leaching in boreal coniferous forests. © 2020, The Author(s).
英文关键词	Boreal forest; Dissolved organic carbon; Fennoscandia; Leaching; Litter; V. myrtillus
语种	英语
scopus关键词	bioavailability; boreal forest; carbon balance; coniferous forest; deciduous tree; dissolved organic carbon; leaching; litterfall; soil nutrient; understory; Bryophyta; Vaccinium myrtillus
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/153144
作者单位	Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden; Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden; Wageningen University, Wageningen, Netherlands
推荐引用方式 GB/T 7714	Hensgens G.,Laudon H.,Peichl M.,et al. The role of the understory in litter DOC and nutrient leaching in boreal forests[J],2020,149(1).
APA	Hensgens G.,Laudon H.,Peichl M.,Gil I.A.,Zhou Q.,&Berggren M..(2020).The role of the understory in litter DOC and nutrient leaching in boreal forests.Biogeochemistry,149(1).
MLA	Hensgens G.,et al."The role of the understory in litter DOC and nutrient leaching in boreal forests".Biogeochemistry 149.1(2020).