Table 42.--Average annual net change of sawtimber volume on timberland by species and component of change, Maryland, 1999 
  
                                                           (In thousands of board feet) 
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                                                                   Component of change                                                          
             Species       ____________________________________________________________________________________________________      Net  
                                                  Gross                Cull      Cull      Net     Harvest   Land use   Total      change       
                             Ingrowth Accretion   growth  Mortality decrement increment   growth   removals  removals  removals                 
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       White/red pine           5,025     6,960    11,986         0         0         0    11,986         0         0         0    11,986  
       Loblolly pine           37,703    21,278    58,981    -5,484         0         0    53,497   -44,809    -1,797   -46,606     6,891  
       Virginia pine            6,378    18,977    25,355    -6,774         0         0    18,581    -7,078    -4,018   -11,097     7,484  
       Other yellow pines         306       305       612         0         0         0       612         0      -897      -897      -285  
       Other softwoods          3,848         0     3,848    -1,012         0         0     2,836         0         0         0     2,836  
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         Total softwoods       53,260    47,521   100,782   -13,270         0         0    87,511   -51,887    -6,712   -58,600    28,912  
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       Red maple               25,377    24,680    50,057   -21,627       796    -5,233    23,993    -7,972   -45,106   -53,078   -29,085  
       Sugar maple                  0     2,441     2,441         0         0    -1,391     1,050    -9,259         0    -9,259    -8,209  
       Hickory                  6,110     1,106     7,216         0         0         0     7,216    -5,563         0    -5,563     1,654  
       Beech                    7,580       506     8,086         0         0         0     8,086    -6,387         0    -6,387     1,699  
       Sweetgum                28,016    18,083    46,099    -9,741       582         0    36,940         0      -686      -686    36,254  
       Yellow-poplar           46,352   114,216   160,568   -10,489         0         0   150,078   -24,332         0   -24,332   125,747  
       Blackgum                 4,458     5,583    10,041      -454         0         0     9,587         0         0         0     9,587  
       Ash-walnut-cherry       14,932      -275    14,656    -3,502         0    -2,912     8,242    -4,447         0    -4,447     3,795  
       Select white oaks       19,159    10,595    29,755   -11,753         0         0    18,002   -28,021    -8,221   -36,243   -18,241  
       Select red oaks          6,081       990     7,070    -2,753         0         0     4,317   -12,335    -2,374   -14,709   -10,392  
       Other white oaks        13,485    10,886    24,371    -2,696     2,968         0    24,644    -3,129   -17,331   -20,460     4,183  
       Other red oaks          18,212    22,833    41,045   -25,181         0         0    15,864   -16,401   -11,317   -27,718   -11,854  
       Black locust             3,689         0     3,689      -829     3,435         0     6,295         0         0         0     6,295  
       Other hardwoods         18,849     9,290    28,140    -1,408         0         0    26,731    -4,110    -7,064   -11,174    15,557  
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         Total hardwoods      212,299   220,935   433,235   -90,435     7,781    -9,536   341,045  -121,955   -92,101  -214,055   126,990  
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       All species            265,560   268,457   534,016  -103,705     7,781    -9,536   428,557  -173,842   -98,813  -272,655   155,901  
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