稀土对马占相思和大叶相思种子萌发和幼苗生长的影响  

Effects of Rare Earth on Seeds Germination and Seedlings Growth of Acacia angium and Acacia auriculiformis

作　　者：韦如萍[1,2] 薛立[2] 陈红跃[2] 胡德活[1] 谢腾芳[2] 王相娥[2] 

机构地区：[1]广东省林业科学研究院,广州510520 [2]华南农业大学林学院,广州510642

出　　处：《土壤通报》2009年第4期896-901,共6页Chinese Journal of Soil Science

基　　金：广东省林业局项目(4400-F02084;4400-F06051)资助

摘　　要：用适宜浓度的混合硝酸稀土对马占相思和大叶相思进行浸种处理可促进种子中内含物的转化,从而促进种子的萌发和幼苗生长,但同一稀土溶液对不同树种的适宜浸种浓度不同。总的来看,在低浓度(10～300mgL-1)范围内种子的发芽率、发芽势和幼苗的苗高、主根长、侧根数、茎叶干重、根干重和总干重均随稀土浓度的增加而呈增长趋势,到达最大值后,随着稀土浓度的增加而下降,而用高浓度(500～1500mgL-1)的稀土浸种则会对种子萌发和幼苗生长产生抑制作用。Acacia mangium willd, and Acacia auriculiformis A. Cunn. were treated with mixed nitric-acid rare earth solution by soaking seed. The results showed that soaking seeds treated with optimum concentration of rare earth solution promoted the transformation of internal substance and germination of seed. However, different species had different optimum concentration of the rare earth solution. Generally, low concentration of rare earth solution （10-300mg L-1） promoted seed germination and seedling growth, the indexes of germination and seedling height, taproot length, branch root number and seedling dry weight. Above indexes decreased after they reached the maximum value with increasing rare earth concentration. Seed germination and seedling growth were inhabited by rare earth of higher concentration （500-1500mg L-l）

关 键 词：稀土 浸种 种子萌发 幼苗生长 

分 类 号：O614.3[理学—无机化学] Q945[理学—化学]