Skip to main content

Table 2 Summary of age scenarios.

From: Longevity and growth of Acacia tortilis; insights from 14C content and anatomy of wood

Core Scenario Date combinations Gompertz parameters Establ.
   I II III IV V VI a b c  
Umm Duhaysy a i - 1998.1 1956.5 1950    267.1 1.971 0.545 1948
Umm Duhaysy a ii - 1998.1 1956.5 1780    282.4 2.027 0.016 1719
Umm Duhaysy a iii - 1998.1 1956.5 1655    308.0 2.113 0.008 1528
Umm Duhaysy a iv - 1998.1 1956.5 1545    342.0 2.218 0.005 1346
Muwaylhah b i 1993.9 1990.2 1979.3 1865 1805   254.4 2.244 0.026 1772
Muwaylhah b ii 1993.9 1990.2 1979.3 1865 1750   282.6 2.346 0.012 1680
Muwaylhah b iii 1993.9 1990.2 1979.3 1865 1685   355.2 2.585 0.007 1561
Muwaylhah b iv 1993.9 1990.2 1979.3 1710 1685   249.9 2.254 0.065 1673
Hulus Upper b i* 1975.5 1940 1910 1770    253.8 1.638 0.021 1714
Hulus Upper b ii* 1975.5 1940 1910 1680    261.1 1.667 0.012 1579
Hulus Upper b iii 1975.5 1925 1805 1770    247.1 1.612 0.097 1759
Hulus Upper b iv 1975.5 1925 1750 1680    247.1 1.612 0.049 1656
Hulus Upper b v 1975.5 1855 1805 1770    247.2 1.612 0.097 1759
Hulus Upper b vi 1975.5 1855 1805 1680    249.1 1.618 0.026 1634
Hulus Upper b vii 1975.5 1855 1750 1680    247.1 1.612 0.049 1656
Hulus Upper b viii 1975.5 1810 1805 1770    249.9 1.623 0.094 1758
Hulus Upper b ix 1975.5 1810 1805 1680    250.0 1.624 0.027 1637
Hulus Upper b x 1975.5 1810 1750 1680    247.5 1.613 0.048 1636
Jimal a i 1998.2 1996.8 1992.8 1991.3 1971.0 1945 235.7 2.915 0.086 1939
Jimal a ii** 1998.2 1996.8 1992.8 1991.3 1971.0 1930 252.1 3.024 0.051 1920
Jimal a iii 1998.2 1996.8 1992.8 1991.3 1971.0 1770 4761.0 6.052 0.003 1661
Jimal a iv 1998.2 1996.8 1992.8 1991.3 1971.0 1660 319.4 595.300 0.022 -
Jimal a v 1998.2 1996.8 1992.8 1991.3 1971.0 1535 - - - -
Jimal a via 1998.2 1996.8 1992.8 1991.3 1963.0 1945 227.8 2.937 0.134 1942
Jimal a vii**a 1998.2 1996.8 1992.8 1991.3 1963.0 1930 234.4 2.923 0.069 1922
Jimal a viiia 1998.2 1996.8 1992.8 1991.3 1963.0 1770 954.8 4.417 0.005 1683
Jimal a ixa 1998.2 1996.8 1992.8 1991.3 1963.0 1660 719500.0 11.050 0.001 1448
Jimal a xa 1998.2 1996.8 1992.8 1991.3 1963.0 1535 - - - -
  1. Date combinations are based on calibrated calendar dates (midpoints of 1 sigma ranges) of 14C dated samples. Some scenarios use other estimates: '*' lower (sample III) and upper (sample II) 1 sigma range, '**' lower 1 sigma range (sample VI). 'a' indicates that the alternative date for sample V is used (see Table 1). Gompertz parameters in italics are not significant (p > 0.05). '-' indicates parameters that couldn't be estimated. Establishment date (Establ.) is defined as the year in which cumulative radial growth was at least 1 mm (Fig. 5).