• Davidson, Christopher B.
  Hardwood Research Cooperative; College of Forest Resources, Box 8002, North Carolina State University, Raleigh, NC
  
• Hafley, William L.
  Hardwood Research Cooperative; College of Forest Resources, Box 8002, North Carolina State University, Raleigh, NC
  
• Frederick, Douglas J.
  Hardwood Research Cooperative; College of Forest Resources, Box 8002, North Carolina State University, Raleigh, NC
  
• Mengel, Dennis L.
  Hardwood Research Cooperative; College of Forest Resources, Box 8002, North Carolina State University, Raleigh, NC
  

The North Carolina State Universlty Hardwood Research Cooperative has recently developed a growth model 'BYPS' for natural bottomland hardwood stands in the southeast. Ingrowth is a necessary component of growth models if stand dynamics are to be realistically simulated. The objective of this study was to develop an equation for the prediction of total stand ingrowth to be included as a sub-model within BYPS. Total stand ingrowth refers to those trees that are below 14.2 centimeters in diameter breast height at the beginning of the inventory period, but are greater than 14.2 centimeters at the end of the period. Length of the inventory period is five years. The preliminary assumption used is that the rate of total stand ingrowth is a function of stand density and can be quantified using basal area per hectare and number of trees per hectare. Permanent growth and yield plots were used to fit a nonlinear model of the form I- a e^*-d(G/N)).