STUDY ON THE FLOWER MASS OF BLACK LOCUST AND MANAGEMENT OF NECTARIFEROUS FOREST IN TAI HANG MOUNTAIN
Bi Jun; Wang Zhenliang; Gao Hongzhen (He Bei Forestry Research Institute Shi Jiazhuang 050061)
The black locust (Robinia pseudoacacia L.) is one of most important nectariferous tree species. Most of black locust forests are not fit for timber production. They are suitable for managemnt as nectar source. Based on 490 sample trees and 81 plots, the flower mass of individual tree and stand of black locust were studied. The flower mass of individual tree is 0-5. 2kg per tree. It is determined by its genetic factor. The flower mass of stand hasclose links with age, G, D, H, M, Wt, Ws, Wb, W, Wl et al. After analysis regression step by step, the main factors that affect the flower mass of stand were screened and the multiple regression estimation model of flower mass of stand was established. The growth dynamics of stand flower mass fdllows the Logistic.The fastest growing point is at 8 years. Its rapid growth period is at 4-12 years. There are significant differences between flower mass dynamics and the growth rules of stem, branch, leaf and root at the late phase of stand growth- These results are useful for the management of nectarferous forest.