截干及立地条件对牛角瓜幼林生长的影响研究

2014年在云南元江进行了牛角瓜不同截干方式和2种立地条件下的造林试验，通过测定分析。结果表明：截干与不截干造林当年生牛角瓜树高和地径的生长量差异极显著，冠幅（南北）、叶片数和花序的增长量差异显著，冠幅（东西）、萌蘖数的增长量差异不显著，截干、截干+除萌的果实增长量与对照差异极显著。截干造林明显优于不截干造林，且以截干造林后当年再除萌效果最好。牛角瓜生长对光照条件较敏感，在光照充足的立地条件下，能发挥其早期速生特性，因此，在营造牛角瓜林时，应选择光照条件相对较好的地块造林。

The Stem Cutting and Different Site Conditions for Afforestation on the Growth Effects of Calotropis gigantean

The different stem cutting mode and 2 site conditions for afforestation experiments on Calotropis gigantean were carried out in Yuanjiang, Yunnan 2014.The results show that cut or not had extremely significant difference on the tree height growth and diameter growth that very year, significant difference on crown width growth (North and South), number of leaves and inflorescence growth and had no significant difference on crown width growth (East and West), shoot number growth. Fruit growth under stem cutting and stem cutting＋ removal of sprouting, the control group were extremely significant different. The stem cutting a forestation was obviously better than not. And removal of sprouting after stem cutting in the same year had the best effect. Calotropis gigantean is sensitive to light conditions. Under the condition of sufficient sunlight, it can play a fast-growing characteristic in its early stage. To achieve adaptable tree for suitable place, it is recommended to choose light conditions are relatively good plot in the building of Calotropis gigantean.