Abstract:
On June 5th, 2019, experiments were condcut on interplanting Tephrosia candida and Sesbania cannabina under Eucalyptus urophylla×E. grandis plantation in Dongmen Forest Farm of Guangxi. On May 15th, 2020 determinations were implemented on soil nutrient content, tree growth. The results showed that interplanting T. candida and S. cannabina increased soil organic matter by 9.66% and 18.44%, as well as soil available nitrogen, phosphorus and potassium (P<0.05), unit area timber volume increased by 46.81% and 35.47%, compared with that of the control. Using the Integrated fertility index (IFI) was evaluated by fuzzy mathematics method. Results suggested that IFI was followed by interplanting S. cannabina> T. candida>CK. Regression analysis indicated that the tree height had significantly positive relation with IFI (P<0.01).