# 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/mirror2007fagr-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: Mirror2007FAGRd15N # Earliest_Year: 1896 # 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 Beech samples 1049, 1102, 1113, 1115 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 #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: age_AD d15N Beech 1049 d15N Beech 1102 d15N Beech 1113 d15N Beech 1115 1896 0.56 1896.5 1897 0.63 1897.5 1898 0.21 1898.5 0.73 1899 1.23 1899.5 1900 -0.08 1900.5 1901 0.65 -1.24 1901.5 1902 1902.5 -0.01 1903 1903.5 1904 -0.21 1904.5 -0.06 1905 -1.34 1905.5 1906 0.64 1906.5 1907 0.53 1907.5 1908 0.5 1908.5 2.34 1909 0.19 1909.5 1910 0.71 1911 0.19 1.99 1911.5 0.56 1 1912 0.17 1.58 1913 -0.09 -0.16 1.21 1913.5 0.77 1914 0.17 -0.42 0.66 1914.5 1915 -0.24 1.16 1.62 1915.5 1.47 1916 0.83 1.88 1916.5 0.55 1917 0.45 1.25 2.71 1917.5 1918 0.85 -0.34 0.64 1918.5 1.27 1919 0.41 -0.16 0.89 1919.5 1920 -2.38 0.79 -0.21 1920.5 0.83 1921 -0.41 0.6 -1.75 1921.5 1922 1.15 0.12 1922.5 -1.28 -0.46 1923 -1.37 1923.5 1.2 1924 0.28 1924.5 1.11 0.63 1925 0.6 1925.5 1926 1.05 1926.5 0.79 1.04 1927 0.32 1927.5 0.64 1928 1.07 1928.5 0.98 0.98 1929 1.56 1929.5 1.9 1930 -0.08 1930.5 0.54 1931 0.71 0.91 1931.5 1932 1.11 1932.5 -0.32 1933 -0.4 1933.5 2.19 1934 1.59 1934.5 1.5 0.68 1935 1935.5 1936 1936.5 0.5 0.23 1937 0.95 1937.5 1938 1.77 1938.5 1939 0.02 1939.5 -0.23 0.67 1940 1940.5 1941 1941.5 1942 -0.86 0.5 0.03 1942.5 1943 1.24 1943.5 1944 1944.5 -0.38 1945 0.16 1945.5 1946 1946.5 -0.46 1947 1.72 1947.5 1948.5 -0.27 0.23 -2.06 1949 1949.5 1950 0.79 1950.5 0.5 1951 5.14 1951.5 1952 0.54 1952.5 -0.07 1.32 1953 1953.5 1954 0.76 1954.5 -2 -1.3 1955 0.39 1955.5 1956 1956.5 -0.88 0.94 1957 -0.27 1957.5 1958 1958.5 0.77 0.43 1959 -0.72 1959.5 1960 0.87 1960.5 -0.02 1961 1961.5 1962 0.38 -0.01 1962.5 -0.29 1963 1963.5 0.05 1964 1964.5 0.24 0.29 1965 1965.5 0.65 1966.5 0.1 1967 0.05 1967.5 1968 1968.5 -0.07 -0.46 1969 1969.5 -1.05 0.53 1970 1970.5 0.93 1971 1971.5 -0.7 1972 1972.5 -0.12 1973 1973.5 0.71 0.83 1974 1974.5 -0.17 1975 -0.03 1975.5 -0.03 1976 1976.5 -0.46 1977 0.22 1977.5 1978 -0.43 1978.5 0.29 1979 1979.5 1980 -0.06 -1.86 1980.5 0.29 1981 -0.88 1981.5 1982 1982.5 1983 0.06 1983.5 -0.31 -0.45 1984 -0.48 1984.5 1985 1985.5 1986 1986.5 -0.52 -0.28 1987 1987.5 1988 0.41 1988.5 -1.13 1989 1989.5 0.09 1990 -0.36 1990.5 -0.39 1991 1992 1992.5 1993 0.56 0.01 0.47 1993.5 1994 1994.5 1995 1995.5 1996 0.25 1996.5 1997.5 -0.93 1998 0.17 1998.5 1999 -0.97 1999.5 0.18 2000.5 2001 2001.5 -0.04 2002 2002.5 2003 -1.04 -0.98 2003.5 2004 -0.42 2005