干旱区生态环境知识资源中心(Arid): Quantifying atmospheric N deposition in dryland ecosystems: A test of the Integrated Total Nitrogen Input (ITNI) method

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DOI	10.1016/j.scitotenv.2018.07.320
	Quantifying atmospheric N deposition in dryland ecosystems: A test of the Integrated Total Nitrogen Input (ITNI) method
	Sickman, James O.1; James, Amanda E.1; Fenn, Mark E.2; Bytnerowicz, Andrzej 2; Lucero, Delores M.1; Homyak, Peter M.1
通讯作者	Sickman, James O.
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2019
卷号	646 页码:1253-1264
英文摘要	Estimating nitrogen (N) deposition to terrestrial ecosystems is complicated by the multiple forms and routes of N loading from the atmosphere. We used the integrated total nitrogen input (ITNI) method, which is based on the principle of isotope dilution within a plant-liquid-sand system, to quantify N inputs to coastal sage scrub ecosystems in Riverside, California. Using the ITNI method, we measured atmospheric N deposition of 29.3 kg N ha(-1) yr(-1) over a range of aboveground plant biomass of 228 to 424 g m(-2). From 85 to 96% of the atmospheric N inputs were taken up by plants in the ITNI modules with most of the assimilation mediated by, and stored in, aboveground biomass. Parallel measurements using conventional approaches yielded deposition rates of 25.2 kg N ha(-1) yr(-1) when using the inferential method and 4.8 kg N ha(-1) yr(-1) using throughfall collectors. The relatively low throughfall estimates were attributed to canopy retention of inorganic N, low rainfall, and to the fact that the throughfall flux data did not include organic N and stomatal uptake of N gases. Also, during dry periods, frequent watering of ITNI modules may have increased stomatal conductance and led to overestimates of N deposition. Across published studies that used the ITNI method, areal N deposition rates varied by similar to 40-fold, were positively correlated with plant biomass and 90% of the variability in measured deposition rates can be explained by plant biomass production. The ITNI method offers a holistic approach to measuring atmospheric N deposition in arid ecosystems, although more study is needed to understand how watering rates effect N deposition measurements. (C) 2018 Elsevier B.V. All rights reserved.
英文关键词	Total nitrogen deposition ITNI method Drylands Inferential method Throughfall
类型	Article
语种	英语
国家	USA
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000445164800122
WOS关键词	DRY DEPOSITION ; NITRIC-ACID ; FOREST ; CANOPY ; AMMONIA ; THROUGHFALL ; METABOLISM ; CALIFORNIA ; EMISSIONS ; EXCHANGE
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218577
作者单位	1.Univ Calif Riverside, Dept Environm Sci, Riverside, CA 92521 USA; 2.USFS, Pacific Southwest Res Stn, 4955 Canyon Crest Dr, Riverside, CA 92507 USA
推荐引用方式 GB/T 7714	Sickman, James O.,James, Amanda E.,Fenn, Mark E.,et al. Quantifying atmospheric N deposition in dryland ecosystems: A test of the Integrated Total Nitrogen Input (ITNI) method[J],2019,646:1253-1264.
APA	Sickman, James O.,James, Amanda E.,Fenn, Mark E.,Bytnerowicz, Andrzej,Lucero, Delores M.,&Homyak, Peter M..(2019).Quantifying atmospheric N deposition in dryland ecosystems: A test of the Integrated Total Nitrogen Input (ITNI) method.SCIENCE OF THE TOTAL ENVIRONMENT,646,1253-1264.
MLA	Sickman, James O.,et al."Quantifying atmospheric N deposition in dryland ecosystems: A test of the Integrated Total Nitrogen Input (ITNI) method".SCIENCE OF THE TOTAL ENVIRONMENT 646(2019):1253-1264.