Abstract:

Three dominant forest types include native oak,slow-growing broad leaved forest and broadleaved forest at medium growing rate were chosen from forest resources investigation classes of Hongshi Forestry Bureau.Four forest growth models up to the "S" growth curve were constructed,and the three dominant forest growth regularities were studied based on the forest resources investigation classes.The results were as follows:The test accuracy of forest growth models was greater than 98%,it presented better fitting effect.The Model(4)for native oak and the booad leaved forest at medium growing rate was best,and the Model(2)for the slow-growing broad leaved forest was best.The first one reached the maximum continuous annual growth and the average growth was the booad leaved forest at medium growing rate,followed by the slow-growing broad leaved forest,and the last one was the native oak,slow-growing broad leaved forest and the forest with the mature age was 50a,56a and 64a respectively.The growth periods of native oak,the slow-growing broad leaved forest and the booad leaved forest at medium growing rate were 27a-70a,24a-64a and 24a-54a respectively.

Key words: forest, growth regularities, growth model, continuous annual growth, average growth