# Mirror Lake, New Hampshire 170 Year Tree Ring Nitrogen Isotope Data #----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. # If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. # # # Online_Resource: http://hurricane.ncdc.noaa.gov/pls/paleox/f?p=519:1:::::P1_STUDY_ID:15311 # # Original_Source_URL: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/treering/isotope/northamerica/usa/newhampshire/mirror2007tsca-d15n.txt # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Tree Rings #-------------------- # Contribution_Date # Date: 2013-10-28 #-------------------- # Title # Study_Name: Mirror Lake, New Hampshire 170 Year Tree Ring Nitrogen Isotope Data #-------------------- # Investigators # Investigators: McLauchlan, K.K.; Craine, J.M.; Oswald, W.W.; Leavitt, P.R.; Likens, G.E. #-------------------- # Description_and_Notes # Description: 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. Physical cores are located in the Paleoenvironmental # Lab at Kansas State University, contact Dr. Kendra McLauchlan for availability. # # #-------------------- # Publication # Authors: Kendra K. McLauchlan, Joseph M. Craine, W. Wyatt Oswald, Peter R. Leavitt, and Gene E. Likens # Published_Date_or_Year: 2007-05-01 # Published_Title: Changes in nitrogen cycling during the past century in a northern hardwood forest # Journal_Name: Proceedings of the National Academy of Sciences # Volume: 104 # Edition: # Issue: 18 # Pages: 7466-7470 # DOI: 10.1073/pnas.0610546104 # Online_Resource: http://www.pnas.org/content/104/18/7466.abstract # Full_Citation: # Abstract: 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. #------------------ # Funding_Agency # Funding_Agency_Name: Henry Luce Foundation # Grant: #------------------ # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: #------------------ # Funding_Agency # Funding_Agency_Name: The Andrew W. Mellon Foundation # Grant: #------------------ # Funding_Agency # Funding_Agency_Name: Natural Sciences and Engineering Research Council # Grant: #------------------ # Funding_Agency # Funding_Agency_Name: Canada Research Chair # Grant: #------------------ # Site_Information # Site_Name: Mirror Lake # Location: North America>United States Of America>New Hampshire # Country: United States Of America # Northernmost_Latitude: 43.6167 # Southernmost_Latitude: 43.6167 # Easternmost_Longitude: -71.25 # Westernmost_Longitude: -71.25 # Elevation: 178 m #------------------ # Data_Collection # Collection_Name: Mirror2007TSCAd15N # Earliest_Year: 1835 # Most_Recent_Year: 2005 # Time_Unit: AD # Core_Length: m # Notes: #------------------ # Chronology: # # # # # #---------------- # Variables # # Data variables follow (have no #) # Data line variables format: Variables list, one per line, shortname-tab-longname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) # d15N of Hemlock samples 1023, 1029, 1032, 1034, 1037, 1038, 1045, 1047, 1050, 1101, 1109, 1110 age_AD age, , , Year AD, , , , ,N d15N delta N15, , , per mil VPDB, , , , ,N d15N delta N15, , , per mil VPDB, , , , ,N d15N delta N15, , , per mil VPDB, , , , ,N d15N delta N15, , , per mil VPDB, , , , ,N d15N delta N15, , , per mil VPDB, , , , ,N d15N delta N15, , , per mil VPDB, , , , ,N d15N delta N15, , , per mil VPDB, , , , ,N d15N delta N15, , , per mil VPDB, , , , ,N d15N delta N15, , , per mil VPDB, , , , ,N d15N delta N15, , , per mil VPDB, , , , ,N d15N delta N15, , , per mil VPDB, , , , ,N d15N delta N15, , , per mil VPDB, , , , ,N #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: age_AD d15N Hemlock 1023 d15N Hemlock 1029 d15N Hemlock 1032 d15N Hemlock 1034 d15N Hemlock 1037 d15N Hemlock 1038 d15N Hemlock 1045 d15N Hemlock 1047 d15N Hemlock 1050 d15N Hemlock 1101 d15N Hemlock 1109 d15N Hemlock 1110 1835.5 -0.69 1838 -0.58 1840.5 -1.96 1843 -1.09 1848.5 -1.34 1853.5 -1.72 1864.5 -1.79 1866 1868 1869 1870.5 1873 1875 1876 -2.42 1877 1878 1880.5 1882 1882.5 1883 0 1884.5 1885 0.67 1886.5 -0.07 1888 1888.5 1.24 1889.5 1891 -0.63 1891.5 -0.26 0.75 0.67 1893.5 1894.5 -0.66 0.27 -0.77 1895.5 -3.26 1896 1896.5 -0.46 0.64 0.09 1897 1897.5 1.21 1898 1898.5 0.08 1899 -1.63 1899.5 -1.25 -1.2 1900 1.11 1900.5 0.7 1901 1901.5 -1.43 1902 1902.5 -0.5 1903 -1.13 1903.5 -0.68 1.41 1904 -2.52 0.59 1904.5 0.01 1905 -1.3 1905.5 -0.63 1906 1906.5 2.06 1907 -1.24 1907.5 -0.19 1.34 0.4 1908 -2 -0.83 0.49 1908.5 1909 -0.07 0.46 1909.5 -0.03 1910 1.1 0.92 1911 -0.29 -0.33 -1.89 -1.04 1.85 0.43 1911.5 1912 0.22 -0.67 -0.15 0.39 1.25 1913 -2.87 0.32 -0.69 1913.5 0.51 1914 -1.22 -0.74 -0.28 -0.23 1914.5 -0.55 -0.88 -0.41 0.22 1915 0.39 0.24 1.01 0.8 1915.5 2.98 -0.28 1916 -0.19 1916.5 0.32 -0.78 0.15 1.01 0.33 1917 -0.6 1917.5 0.68 -0.62 0.22 1918 -0.27 3.53 1918.5 0.36 -2.75 -0.55 -0.49 -0.52 1919 -1.39 -1.64 -0.89 -0.33 1919.5 0.67 1920 -0.39 -1.05 0.85 0.26 1920.5 1921 1..36 -1.53 0.87 1921.5 0.03 0.6 -0.48 -1.88 1.33 1922 -0.75 1922.5 1.69 1923 -1.29 0.2 0.25 1923.5 0.47 -1.7 0.1 -0.79 1924 0.74 -0.24 -1.48 0.29 1924.5 -0.86 1.33 1925 -0.91 -0.34 1.45 1925.5 -0.66 -2.09 0.73 -1.26 1926 0.22 1.07 1926.5 -0.98 -0.07 1927 0.25 -0.96 -0.01 1927.5 -2.14 0.25 -1.65 0.39 1928 -1.75 1928.5 -0.12 0.63 0.46 1929 3.76 -1.86 1929.5 0.64 -1.89 -0.69 1930 -2.1 0.73 1930.5 0.49 -1.35 0.45 -0.34 1931 2.17 1931.5 0.34 -0.91 1932 0.29 1932.5 -1.06 -0.7 1933 -1.61 0.24 1933.5 0.97 -0.49 -0.69 2.03 1934 -1.18 1934.5 -0.03 -0.62 -1.12 1935 1935.5 -1.16 -1.13 -0.3 1936 -0.48 1936.5 0.38 -0.15 0.72 1937 1937.5 -0.51 1938 -0.65 0.04 -1.78 1938.5 -4.21 -0.44 1939 1939.5 -1.22 -2.56 0.31 1940 1940.5 -1.95 1941 -0.92 0 -1.82 1941.5 -0.76 -0.4 1942 -0.18 1942.5 -0.52 1943 -2.6 1943.5 -2.16 -1.46 -1.03 1944 -0.63 -1.84 -1.61 1944.5 -1.53 1945 -1.78 0.08 1945.5 -2.44 1946 -0.79 1946.5 0.36 0.31 1947 0.92 1947.5 -2.5 -2.48 0.06 0.2 1948.5 -1.89 0.49 1949 0.25 0.03 1949.5 -0.56 -2.85 1950 1.08 -0.75 1950.5 -1.71 1951 -0.85 0.37 1951.5 -2.9 -0.15 -0.91 1952 -1.39 1952.5 -1.62 -1.1 -1.18 -0.02 1953 -0.87 1953.5 1.06 1954 -0.22 1954.5 -1.47 -0.08 1955 -1.67 -1.83 -3.22 -0.17 1955.5 1956 1956.5 1.03 1957 -0.6 1.21 1957.5 -1.09 1958 -1.76 -1.22 -1.21 -1.33 1958.5 -1.84 -2.18 -0.72 1959 1959.5 -0.28 -1.9 1960 1960.5 -1.72 2.02 1961 1961.5 -1.37 -0.48 1962 1962.5 -0.87 -1.47 -1.24 0.42 1963 -1.25 0.48 1963.5 1964 -1.52 -2.53 1964.5 1965 -1.82 0.23 -0.61 1965.5 0.2 1966.5 -1.61 -0.96 -1.46 1967 1967.5 -1.21 -0.16 0.45 1968 -1.71 -2.09 -0.02 -0.48 1968.5 1969 -1.66 1969.5 -0.84 -2.09 1970 -1.33 1970.5 0.48 1971 0.46 1971.5 -0.85 -0.51 -0.95 1972 -1.53 -0.28 1972.5 -1.62 1973 0.99 -2.67 -0.94 1973.5 0.37 -0.61 1974 -1.68 0.74 1974.5 -1.98 -0.9 -1.29 1975 -0.85 1975.5 -1 -1.38 1976 1976.5 -1.84 -2.74 1977 -1.47 1977.5 -2.06 -1.79 1978 -2.92 1978.5 1979 -1.76 1979.5 -1.75 -2.21 -2.6 -1.31 1980 -1.79 -0.47 1980.5 -1.49 1981 -0.5 1981.5 -2.09 1982 -2.62 1982.5 -1.9 -2.87 -1.67 1983 -2.2 -1.83 1983.5 1984 -1.65 -1.09 1984.5 0.68 1985 -0.32 -2.19 1985.5 -2.88 -1.78 1986 -1.57 -1.81 -2.25 1986.5 1987 1.78 -2.14 1987.5 1988 -1.88 1988.5 -3.5 1989 -2.03 0.61 -0.73 1989.5 -1.07 -1.26 1990 -2.01 -2.42 -2.26 1990.5 -1.06 -1.51 1991 1992 -3.18 -4.02 -2.8 1992.5 -1.82 -1.66 1993 -2.17 -1.73 -1.9 1993.5 -2.45 -0.72 -0.55 1994 1994.5 -3.08 1995 -2.49 -1.33 1995.5 1996 -2.54 -0.27 -3.13 -2.82 -1.25 1996.5 -1.23 1997.5 -2.05 -2.48 -0.89 -2.79 -1.6 1998 -2.11 1998.5 -1.97 -1.52 1999 -2.28 -2.43 -0.3 1999.5 -2.57 2000.5 -2.13 -3.2 2001 -1.09 2001.5 -3.57 -1.96 -2.23 -1.97 -1.5 2002 -1.1 -2.19 2002.5 -1.86 -2.04 2003 -0.94 -4.19 2003.5 -1.37 -2.18 -0.67 -1.97 2004 2005