Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
Comment
. 2016 Jun 28;113(26):E3594-5.
doi: 10.1073/pnas.1607543113. Epub 2016 Jun 15.

Rise and fall of nitrogen deposition in the United States

Enzai Du  1
Affiliations
Comment

Rise and fall of nitrogen deposition in the United States

Enzai Du. Proc Natl Acad Sci U S A. .
No abstract available

PubMed Disclaimer

Conflict of interest statement

The author declares no conflict of interest.

Figures

Fig. 1.
Fig. 1.
Changes in national mean wet deposition (unit: kg N ha−1 yr−1) of (A) total inorganic N (TIN), (B) ammonium (NH4+), (C) nitrate (NO3−), and (D) ammonium percentage of wet inorganic N deposition in the United States between 1985 and 2012. Observed data of wet deposition were available from National Atmospheric Deposition Program (nadp.sws.uiuc.edu/). Sites were excluded if data were missing for 1 or more years and totally 151 sites were used in this analysis. The piecewise linear regression analysis was conducted by using the “segmented” package (5) for R software.
See this image and copyright information in PMC

Comment on

References

    1. Li Y, et al. Increasing importance of deposition of reduced nitrogen in the United States. Proc Natl Acad Sci USA. 2016;113(21):5874–5879. - PMC - PubMed
    1. Du EZ, de Vries W, Galloway JN, Hu X, Fang J. Changes in wet nitrogen deposition in the United States between 1985 and 2012. Environ Res Lett. 2014;9(9):095004.
    1. Houlton BZ, et al. Intentional versus unintentional nitrogen use in the US: Trends, efficiency and implications. Biogeochemistry. 2013;114(1):11–23.
    1. Davidson EA, et al. Excess nitrogen in the U.S. environment: Trends, risks, and solutions. Issues in Ecology. 2012;15:1–16.
    1. Muggeo VM. Segmented: An R package to fit regression models with broken-line relationships. R News. 2008;8(1):20–25.

LinkOut - more resources