Abstract:

In this paper, 195 dominanting stem-analysis data of Robinia pseudoacacia were used to construct single-form and multiple form site index chart, Richard function H=a(1 —e^{- bA})^c was taken for dominant height growth model of Robinia pseudoacacia in Liaoning province. On the basis of analizing the characteristics of dominant height growth, 5 index classes were divided out within 5～15m (baseline age was 12 years, and the interval of site index class was 2m), and single form site index table was constructed after derived curve was expanded by differential method. The optimum multiple form site index curve was fitted by means of the adjusted stem-analysis data and the problem that site index curve did not pass the index point has been solved, multiple form site index curve was constructed. The examination results indicated that: the accuracy of single form and multiple form site index tables were very high; however, the accuracy of multiple form site index table was higher than that of the single-form site index table and the table was more practical, which whowed that the dominant height growth was multiple formed. The paper also evaluated productivity of Robinia pseudoacacia plantation in Liaoning Province.

Key words: Robinia pseudoacacia, Single form site index table, Multiple form site index table, Productivity