Precision Analysis on Growth Rates Estimated by Integrated Whole Stand Growth and Yield Model

Integrated whole stand growth and yield model(ISGM)is such a model that its estimate of growth is compatible with the estimate of yield.Any model like this can be used to predict the growth rate of the stand.The nominal age method which is based on ISGM and Marsh hypothesis is a good method to predict the net growth rate of the stand.The calculation approach of this method is stated step by step in this paper. This method has been used to estimate the growth rates of two tree species in Daqingshan Experimental Bureau and the result is promising. This method can get unbiased estimate of growth rates. Accuracy of this method for one type of stands is equivalent to the accuracy for investigating 1～4 permanent plots. Therefore,this method is suitable for estimating general growth rate of many types of stands in an area.