稀土对尾叶桉幼林生长及土壤化学性质的影响

通过对稀土不同施用方式(稀土加入基肥、稀土溶液浸根和稀土溶液叶面喷施)对尾叶桉幼林的影响研究,结果表明:3种使用方法都对2.5 a生尾叶按幼林的生长起促进作用,在稀土加入基肥中,使用7.5 g/株效果最好;在稀土溶液浸根中,使用500 mg/kg效果最好;在稀土溶液叶面喷施中,使用200 mg/kg效果最好.从1.5 a生桉树幼林的单株生物量看,稀土加入基肥、稀土溶液浸根和稀土溶液叶面喷施3种施用稀土方式均使桉树幼林生物量得到不同程度的提高.稀土的3种施用方式均能使桉树幼林林地土壤养分含量得到不同程度的提高.影响程度的大小顺序为稀土加入基肥>稀土溶液浸根>稀土溶液叶面喷施.

Effects of Rare Earth Element on Growth of Young Forest of Eucalyptus urophylla and Soil Chemical Properties

The experiment of rare earth elements applied in three methods in the young plantation of Eucalyptus urophylla located at Gaofeng farm was conducted in this study.The results indicated that the average diameter at breast height(DBH),height and volume of 2.5-years-old trees from the treatment of 7.5g/plant was 11.93 cm,15.30 m and 0.084 m3/tree respectively,significantly higher than the control,and was increased 23.89%,21.28% and 77.29% compared with the control when the rare earth elements were used as the base fertilizer.When the rare earth was applied in dipping the roots as a fertilizer,the average DBH,height and volume of 2.5-years-old trees from the treatment of 500 mg/kg was 12.94 cm,15.37 m and 0.097 m3/tree respectively,significantly greater than the control and other treatments,and was increased 31.61%,17.68% and 92.41% compared with the control.In foliar fertilization experiment,the average DBH,height and volume of 2.5-years-old trees from the treatment of 200 mg/kg was 11.43 cm,14.76 m and 0.075 m3/tree respectively and was increased 18.71%,16.99% and 58.40% compared with the control.