尾叶桉萌芽性能差异及影响因素分析

Coppice Performance and analysis of the factors influencing for Eucalyptus urophylla

研究了尾叶桉萌芽性能差异及伐桩直径、高度对萌芽性能的影响。结果表明:尾叶桉萌芽点数、萌芽条数和萌芽条高度均服从低峰态正态分布,但萌芽点数和萌芽条数为正偏斜,萌芽条高度为负偏斜。从变异程度而言,三者均属中等变异。随着伐桩直径增大,萌芽点数和萌芽条数均随之增加;伐桩直径对萌芽条高度影响不大,仅对单桩最短萌条高有抑制作用。伐桩高度的影响复杂,当伐桩高度低于15 cm时,随着伐桩高度增大,萌芽点数、萌芽条数和萌芽条高度总体上均略有增加;但当伐桩高度超过15 cm时,随着伐桩高度增大,萌芽点数略有下降,萌芽条数和萌芽条高度均呈明显降低趋势。还发现,伐桩被土埋或被枯落物覆盖后其萌芽性能明显受到抑制,经过4种除草剂、"瑞莱特"催腐剂及人工劈除萌芽条的对比发现,2-2、3-2和4-1处理效果最佳,即8.01g/L95%草甘膦(可溶性粒剂+有机硅助剂)、7.5 mL/L克无踪(20%百草枯,水剂)和8.57 mL/L 2,4-甲氯钠等3种药剂处理效果最佳。

The effects of Eucalyptus urophylla coppice performance differences,stump diameter and stump height on germination performance were studied.The results show that the number of sprout spot,coppice number and height followed the Low-kurtosis normal distribution,but the number of sprout spot and coppice number were deflected from its course,the coppice height negative deflection.From mutation extent,all belong to the medium range.With stump diameter increased,the number of sprout spot and coppice number grew in number,but the lowest coppice height decreased.When the stump＇s height was15 cm below,as the stump height rised,the number of sprout spot,coppice number and height slightly increased;but when the stump was over 15 cm,rising stump height,the number of sprout spot slightly decreased,the coppice number and height obvious reduced.The study also found that when the stump was buried or covered by falling litters,the coppice performance was rennarkably inhibited by inflation.Furthermore,after contrast with four herbicides,＂the wright＂ withdrawal of the pedants and artificial split for budding,it was found that the best treatment efficiency was 2-2,3-2 and 4-1,which is 8.01 g/L glyphosate 95%（soluble granule＋ organic silicon assistant）,7.5 mL/L paraquat 20%（aqua） and 8.57 mL/L MCPA-Na.