Table 34.  Average annual net change of sawtimber volume on timberland by species and component of change, Delaware, 1999 
  
                                                           (In thousands of board feet) 
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                                                                  Component of change                                                           
      Species group      ______________________________________________________________________________________________________         Net  
                                                       Gross                      Cull         Cull         Net                       change    
                            Ingrowth    Accretion      growth     Mortality    decrement    increment      growth      Removals                 
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    Loblolly pine              7,915        8,842       16,756       -6,348            0            0       10,409       -9,024        1,385  
    Virginia pine                457            0          457            0            0            0          457       -9,869       -9,412  
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      Total softwoods          8,371        8,842       17,213       -6,348            0            0       10,865      -18,893       -8,027  
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    Red maple                  5,413        8,349       13,763            0        1,037       -2,825       11,975            0       11,975  
    Beech                      1,209        3,387        4,595      -15,407            0            0      -10,811            0      -10,811  
    Sweetgum                   5,384        4,582        9,966       -1,941            0            0        8,025            0        8,025  
    Yellow-poplar              3,412        1,223        4,635            0            0            0        4,635      -18,317      -13,682  
    Blackgum                     969          476        1,445       -2,003            0            0         -558            0         -558  
    Ash-walnut-cherry          2,485       -1,046        1,439            0            0            0        1,439       -7,438       -5,999  
    Select white oaks          5,265        6,739       12,004       -3,213            0            0        8,792       -3,834        4,958  
    Select red oaks            1,801        1,086        2,887            0            0            0        2,887            0        2,887  
    Other red oaks             5,680       10,327       16,007         -627            0            0       15,380            0       15,380  
    Other hardwoods              861            0          861            0            0            0          861            0          861  
                         ____________________________________________________________________________________________________________________ 
      Total hardwoods         32,479       35,122       67,601      -23,190        1,037       -2,825       42,624      -29,589       13,035  
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    Total, all species        40,851       43,964       84,815      -29,538        1,037       -2,825       53,489      -48,482        5,007  
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