noaa-tree-15311 Mirror Lake, New Hampshire 170 Year Tree Ring Nitrogen Isotope Data McLauchlan, K.K.; Craine, J.M.; Oswald, W.; Leavitt, P.R.; Likens, G.E. Mirror Lake, New Hampshire 170 Year Tree Ring Nitrogen Isotope Data 2013-10-28 NCDC-Paleoclimatology ONLINE Files 10.25921/wdge-p784 https://www.ncdc.noaa.gov/paleo/study/15311 Investigator K.K. McLauchlan Investigator J.M. Craine Investigator W. Oswald Investigator P.R. Leavitt Investigator G.E. Likens earth science paleoclimate tree ring delta 15N,wood,null,per mil,null,tree ring,normalized,isotope ratio mass spectrometry,N,"Betula papyrifera, standardized to a mean of zero" earth science paleoclimate tree ring delta 15N,wood,null,per mil,null,tree ring,normalized,isotope ratio mass spectrometry,N,"Fagus grandifolia, standardized to a mean of zero" earth science paleoclimate tree ring delta 15N,wood,null,per mil,null,tree ring,normalized,isotope ratio mass spectrometry,N,"Tsuga canadensis, standardized to a mean of zero" earth science paleoclimate tree ring delta 15N,wood,null,per mil,null,tree ring,normalized,isotope ratio mass spectrometry,N,"Acer saccharum, standardized to a mean of zero" earth science paleoclimate tree ring age,null,null,year Common Era,null,tree ring,null,null,N,null earth science paleoclimate tree ring delta 15N,wood,null,per mil,null,tree ring,normalized,isotope ratio mass spectrometry,N,"Fraxinus americana, standardized to a mean of zero" earth science paleoclimate tree-ring width geoscientificInformation biogeochemical cycles ACSH Acer saccharum Marsh. sugar maple 1835 AD 2005 AD 115 cal yr BP -55 cal yr BP Complete 43.6167 43.6167 -71.25 -71.25 178 178 Continent North America United States Of America New Hampshire Mirror Lake>LATITUDE 43.6167>LONGITUDE -71.25 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Kendra K. McLauchlan, Joseph M. Craine, W. Wyatt Oswald, Peter R. Leavitt, and Gene E. Likens 2007 Proceedings of the National Academy of Sciences 104 18 7466-7470 10.1073/pnas.0610546104

Nitrogen (N) availability, defined here as the supply of N to terrestrial plants and soil microorganisms relative to their N demands, limits the productivity of many temperate zone forests and in part determines ecosystem carbon (C) content. Despite multidecadal monitoring of N in streams, the long-term record of N availability in forests of the northeastern United States is largely unknown. Therefore, although these forests have been receiving anthropogenic N deposition for the past few decades, it is still uncertain whether terrestrial N availability has changed during this time and, subsequently, whether forest ecosystems have responded to increased N deposition. Here, we used stable N isotopes in tree rings and lake sediments to demonstrate that N availability in a northeastern forest has declined over the past 75 years, likely because of ecosystem recovery from Euro-American land use. Forest N availability has only recently returned to levels forecast from presettlement trajectories, rendering the trajectory of future forest N cycling uncertain. Our results suggest that chronic disturbances caused by humans, especially logging and agriculture, are major drivers of terrestrial N cycling in forest ecosystems today, even a century after cessation. STUDY NOTES: Nitrogen isotopic data (d15N) for 5 tree species for the past 150 years, from cores collected near Mirror Lake, New Hampshire. Data from cores of Tsuga canadensis, Acer saccharum, Betula papyrifera, Fagus grandifolia, and Fraxinus americana are included. 5.15-mm diameter increment bores were acquired from 22 trees divided among the three subwatersheds of Mirror Lake. Each bore was cut into 30-mg sections with sections divided along boundaries between ring widths. On average, a section contained wood deposited during 2.75 years. The 15N:14N ratio of each section was determined at the University of California, Davis, on a PDZ Europa 20-20 isotope ratio mass spectrometer. IITRDB008

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/northamerica/usa/newhampshire/mirror2007tsca-d15n.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/northamerica/usa/newhampshire/mirror2007acsa-d15n.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/northamerica/usa/newhampshire/mirror2007bepa-d15n.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/northamerica/usa/newhampshire/mirror2007fagr-d15n.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/northamerica/usa/newhampshire/mirror2007fram-d15n.txt USA/NOAA DIF Version 9.8.4 2019-03-01 2019-03-01