Seedling Experiments on Three Broadleaved Tree Species in Dry-hot Valley of the Jinshajiang River

The seeds of Leucaena leucoephala, Flemingia macrophylla and Trema laeuigata were treated with 2 measures, i.e., sulphuric acid erosion with 3 time treatments including 3 min, 6min and 12 min, and water soaking with 3 treatments including the soaking with cold water for 24 h, with 50℃ hot water for 24 h and with boiling water for 24 h. The laboratory and nursery germination results showed that acid erosion was applicable to all the 3 studied tree species. There was significant difference in germination rates among 3 acid erosion treatments and the effects ordered as 6 min > 12 min > 3 min. It was showed by the experiments that there was no significant difference in germination rates among the 3 water soaking treatments. The most effective treatment combinations for the 3 tree species Leucaena leucoephala; Flemingia macrophylla; Trema laeuigata; were A₁B₂C₂, A₂B₂C₃ and A₃B₂C₁ whose germination rates reached 90.0%, 84.3% and 76.4% respectively. It was indicated by growth of the seedlings bred from the treated seeds and by growth of the corresponding young plantation in the early stage that the above seed treatment did not have obvious side effects on the growth of seedlings and young plantation.