气候变化领域集成服务门户(CCPortal): Growing season soil warming may counteract trend of nitrogen oligotrophication in a northern hardwood forest

CCPortal

DOI	10.1007/s10533-020-00717-z
	Growing season soil warming may counteract trend of nitrogen oligotrophication in a northern hardwood forest
	Harrison J.L.; Schultz K.; Blagden M.; Sanders-DeMott R.; Templer P.H.
发表日期	2020
ISSN	0168-2563
起始页码	139
结束页码	152
卷号	151 期号:2020-02-03
英文摘要	Over the next century, many mid and high latitude temperate ecosystems are projected to experience rising growing season temperatures and increased frequency of soil freeze/thaw cycles (FTCs) due to a reduction in the depth and duration of the winter snowpack. We conducted a manipulative field experiment in a northern hardwood forest at the Hubbard Brook Experimental Forest in New Hampshire to determine the interactive effects of climate change across seasons on rates of net N mineralization, foliar N, and natural abundance foliar 15N (δ15N) in red maple (Acer rubrum) trees. We warmed soils 5 °C above ambient temperatures and induced winter FTCs to simulate projected changes over the next century. Net N mineralization was dominated by ammonification and increased with warmer soil temperatures, but was not affected by soil FTCs in the previous winter. Similarly, warming led to increased foliar N concentrations and δ15N, with no effect of soil FTCs. Together, our results show that growing season soil warming increases soil N availability and N uptake by trees, which may offset the previously observed negative effects of a smaller snowpack and more frequent soil freezing on N cycling. We conclude that soil warming in the growing season may counteract the trend of reduced soil N availability relative to plant N demand (i.e. N oligotrophication) observed in northern hardwood forests. This research demonstrates that climate change across seasons affects N cycling in northern hardwood forests in ways that would have not been apparent from examining one season alone. © 2020, Springer Nature Switzerland AG.
英文关键词	Natural abundance foliar N isotopes; Net N mineralization; Nitrogen; Northern hardwood forest; Oligotrophication
语种	英语
scopus关键词	Acer rubrum
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/153092
作者单位	Department of Biology, Boston University, 5 Cummington Mall, Boston, MA 02215, United States; Earth Systems Research Center and Department of Natural Resources and Environment, 8 College Road, Durham, NH 03824, United States
推荐引用方式 GB/T 7714	Harrison J.L.,Schultz K.,Blagden M.,et al. Growing season soil warming may counteract trend of nitrogen oligotrophication in a northern hardwood forest[J],2020,151(2020-02-03).
APA	Harrison J.L.,Schultz K.,Blagden M.,Sanders-DeMott R.,&Templer P.H..(2020).Growing season soil warming may counteract trend of nitrogen oligotrophication in a northern hardwood forest.Biogeochemistry,151(2020-02-03).
MLA	Harrison J.L.,et al."Growing season soil warming may counteract trend of nitrogen oligotrophication in a northern hardwood forest".Biogeochemistry 151.2020-02-03(2020).