适于金沙江干热河谷造林用的6个树种的育苗施肥试验

对适于金沙江干热河谷造林用的川楝、墨西哥柏、圆柏、新银合欢、苏门答腊金合欢、山合欢等6个树种进行了育苗施肥试验。结果表明:复合肥能明显提高各树种苗木的株高、地径和生物量,其中以施用1%复合肥的效果最佳,一般以施用0.5%~1.0%为宜;尿素对这些树种苗木的生长也有促进作用,尤其是对川楝、新银合欢、苏门答腊金合欢苗木的增长效果更为显著,生产中用量以0.3%~0.5%为宜;过磷酸钙在这些树种的育苗生产中以1%的用量更为适合。试验结果还表明,育苗期间采用1%的过磷酸钙 1%的复合肥 0.5%的尿素,是此6个树种苗期施肥的最佳组合。合理施肥能缩短苗木出圃的时间,墨西哥柏、圆柏2个树种一般可提前1~2个月出圃,而对于川楝、新银合欢、苏门答腊金合欢3个树种可培育出优质苗木。

Seedling Fertilization Experiments on Six Species Suitable for Reforestation at Dry and Hot Valley of Jinsha River

Seedling fertilization experiments were carried out on six species suitable for the reforestation at dry and hot valley of Jinsha River,namely Melia toosendan,Cupressus lusitanica,Cupressus duclouxiana,Leucaena leucocephala cv.Salvador,Acacia glauca and Albiza kalkora.The experimental results showed that compound fertilizer could significantly increase the height,basal diameter and biomass of seedling,and 1 % compound fertilizer with the best effect.Carbamide can also promote the growth of these species,especially for Melia toosendan,Leucaena leucocephala cv.Salvador,Acacia glauca,the suggested amount is 0.3 % ~ 0.5 %.Calcium superphosphate of 1 % is quite proper for the seedling raising of these species.The experimental results also indicated that in seedling raising of these six species,the most optimum fertilizer combination is 1 % Calcium superphosphate,1 % compound fertilizer and 0.5 % carbamide.Proper fertilization can shorten the time of seedling raising,the seedling raising time of Cupressus lusitanica and Cupressus duclouxiana can be shortened by one to two months.Treated with fertilizers properly,the vigorous seedlings of Melia toosendan,Leucaena leucocephala cv.Salvador,Acacia glauca can be cultivated.