气候变化领域集成服务门户(CCPortal): Streamflow variability controls N and P export and speciation from Alaskan coastal temperate rainforest watersheds

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DOI	10.1007/s10533-020-00752-w
	Streamflow variability controls N and P export and speciation from Alaskan coastal temperate rainforest watersheds
	Fellman J.B.; Hood E.; D’Amore D.V.; Edwards R.T.
发表日期	2021
ISSN	1682563
起始页码	253
结束页码	270
卷号	152 期号:2021-02-03
英文摘要	The perhumid coastal temperate rainforest (PCTR) of northwestern North America is projected to become warmer and wetter in coming decades, with largely unquantified implications for the magnitude and speciation of riverine nitrogen (N) and phosphorus (P) export from PCTR ecosystems. We collected streamwater at weekly to monthly intervals for a year and intensively during two multi-day storms (one each in summer and the autumn rainy season) from streams draining three of the most common landcover types in southeast Alaska (poor fen, forested wetland and upland forest). Our goal was to investigate how seasonal and episodic (stormflows) changes in runoff influence the magnitude and species of dissolved N and P exported from PCTR watersheds. Riverine yields of total dissolved N and P ranged from 238 to 406 kg km2 year− 1 for N and 11 to 17 kg km2 year− 1 for P and were dominated by organic nutrient forms. Yields of N and P showed a varied response to runoff, with both hydrologic transport and source limitation of nutrient yields observed across the landcover types. During stormflows, log transformed ratios of dissolved inorganic N to soluble reactive P decreased from prestorm levels of ~ 1.0 to 1.5 to less than 0.3 during peak flow at all sites, illustrating that storms induce ephemeral changes in inorganic nutrient export and stoichiometry. Our findings highlight the pulsed nature of dissolved N and P export from PCTR watersheds suggesting that future changes in the seasonality and intensity of precipitation may influence the flow of terrestrial nutrients to marine ecosystems. © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG part of Springer Nature.
英文关键词	Biogeochemistry; Nutrients; Runoff; Stoichiometric ratio; Storm; Stream
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/184626
作者单位	Department of Natural Sciences and Alaska Coastal Rainforest Center, University of Alaska Southeast, Juneau, AK, United States; Forest Service, U.S. Department of Agriculture, Pacific Northwest Research Station, Juneau, AK, United States
推荐引用方式 GB/T 7714	Fellman J.B.,Hood E.,D’Amore D.V.,et al. Streamflow variability controls N and P export and speciation from Alaskan coastal temperate rainforest watersheds[J],2021,152(2021-02-03).
APA	Fellman J.B.,Hood E.,D’Amore D.V.,&Edwards R.T..(2021).Streamflow variability controls N and P export and speciation from Alaskan coastal temperate rainforest watersheds.Biogeochemistry,152(2021-02-03).
MLA	Fellman J.B.,et al."Streamflow variability controls N and P export and speciation from Alaskan coastal temperate rainforest watersheds".Biogeochemistry 152.2021-02-03(2021).