【摘要】 <正> 1984年我们引进5种乔木型热带相思(Acacia spp.)的不同种源,分别在我国热带地区的海南岛琼海县白石岭林场和广东省遂溪县进行试验,现将3年种源试验初步结果简介如下。 一、试验点立地条件及试验设计更多还原

【Abstract】 5 tropical Acacias with different seed sources were introduced to China in 1984. Species and provenance tests have been carried out in the tropical region of China, i.e. at the Qionghai Forest Farm and the Suixi Forest Experiment Station. 1.SitesLocation Lat.(N) Long.(E) Elev.(m) MAT(℃) MAR(mm) Soil Suixi F.E.S. 21°25’ 110°20’ 40 22.8 1775 lateriteQionghai F.F. 19°14’ 110°28’ 20 23.9 2027 alluvial lateriteA randomized complete blot design with 4 replications was employed. Each plot contained 25 plants with spacing 3×3 m.2.Results:(1)A. crassicarpa -It is the fastest growing species among the 5 tropical Acacias. Seed source from PNG grows significantly faster than those from Queensland. Seedlots 13683 and 13682 from PNG are the most promising ones which grow fast and have a high percentage of straight stems.(2)A. auriculiformis - Seedlot 13686 (from PNG) and 13681 (from QLD) with 60 percentage of straight stems grow faster than the other seed sources.(3)A. aulacocarpa- Seedlot 13689 from PNG appears to be performing better than those from QLD, i.e. with fast growing and high percentage of straight stems.(4)A. leptocarpa - It starts fruiting. 70 percentage of stem are straight.(5)A. cincinnata - It is the slowest one among the 5 tropical acacias.更多还原