气候变化领域集成服务门户(CCPortal): Watershed Alnus cover alters N:P stoichiometry and intensifies P limitation in subarctic streams

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DOI	10.1007/s10533-021-00776-w
	Watershed Alnus cover alters N:P stoichiometry and intensifies P limitation in subarctic streams
	Devotta D.A.; Fraterrigo J.M.; Walsh P.B.; Lowe S.; Sewell D.K.; Schindler D.E.; Hu F.S.
发表日期	2021
ISSN	1682563
起始页码	155
结束页码	176
卷号	153 期号:2
英文摘要	In many watersheds, nitrogen (N)-fixing alder (Alnus spp.) provides key nutrient subsidies to terrestrial and aquatic ecosystems. The importance of these subsidies may increase as alder cover expands under climate warming at high latitudes. We assessed how landscape features and meteorological conditions affect aquatic N and phosphorus (P) availability and stoichiometry in 26 streams across natural gradients of alder cover in southwestern Alaska over the spring and summer, covering 4 years. Analyses of resin lysimeter samples from select watersheds showed that annually, soils under alder leached almost three times more N, and two times more P than under non-alder vegetation. Stream NO3− concentrations displayed a non-linear relationship with alder cover; NO3− was low where alder cover was < 30%, but increased markedly where alder cover was > 30%. Watershed elevation was inversely related to alder cover, stream NO3− concentrations, and stream NO3− yields. Dissolved and particulate stream P were unrelated to alder cover, watershed elevation or discharge, highlighting decoupling of controls on P between terrestrial and aquatic ecosystems. Snowmelt-associated nutrient pulses and hydrology likely resulted in greater stream N and P in the spring, compared to the summer. However, weather parameters only impacted stream N via their interaction with alder. Stream DIN:TP increased with alder cover and decreased with elevation, suggesting that alder intensified P-limitation. Hence, aquatic P-limitation may become increasingly pronounced as climate-induced alder expansion continues. These results demonstrate that the elevational gradient in watershed alder cover determined spatial patterns in stream N availability and nutrient limitation. © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG.
英文关键词	Alaska; Alder; Nitrate; Phosphorus; Streams; Watershed biogeochemistry
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/184612
作者单位	Program in Ecology, Evolution, and Conservation Biology, University of Illinois, Urbana, IL 61801, United States; Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, IL 61801, United States; Togiak National Wildlife Refuge, U.S. Fish and Wildlife Service, Dillingham, AK 99576, United States; Eastern Shore of Virginia National Wildlife Refuge, U.S. Fish and Wildlife Service, Cape Charles, VA 23310, United States; College of Public Health, University of Iowa, Iowa City, IA 52246, United States; School of Aquatic and Fishery Sciences, University of Washington, Seattle, WA 98105, United States; Department of Plant Biology, Department of Geology, University of Illinois, Urbana, IL 61801, United States; Department of Biology, Washington University, St. Louis, MO 63130, United States; Department of Earth and Planetary Sciences, Washington University, St. Louis, MO 63130, United States
推荐引用方式 GB/T 7714	Devotta D.A.,Fraterrigo J.M.,Walsh P.B.,et al. Watershed Alnus cover alters N:P stoichiometry and intensifies P limitation in subarctic streams[J],2021,153(2).
APA	Devotta D.A..,Fraterrigo J.M..,Walsh P.B..,Lowe S..,Sewell D.K..,...&Hu F.S..(2021).Watershed Alnus cover alters N:P stoichiometry and intensifies P limitation in subarctic streams.Biogeochemistry,153(2).
MLA	Devotta D.A.,et al."Watershed Alnus cover alters N:P stoichiometry and intensifies P limitation in subarctic streams".Biogeochemistry 153.2(2021).