粤西野生种香根草种群构件特征对密度的响应  

Responses of ramet characteristics of wild vetiver population to density in western Guandong of China

作　　者：彭雪梅[1,2] 刘金祥[2] 杨允菲[3] 

机构地区：[1]贵州师范学院实验教学管理中心,贵阳550018 [2]湛江师范学院热带草业科学研究所,广东湛江524048 [3]东北师范大学草地研究所植被生态科学教育部重点实验室,长春130024

出　　处：《生态学杂志》2014年第2期335-339,共5页Chinese Journal of Ecology

基　　金：国家级星火计划项目(2012GA780024);广东高校边缘热带特色植物资源开发中心项目(GCZX-B1002)资助

摘　　要：对试验田栽种的野生种香根草种群分蘖株各性状对密度的响应进行了统计。结果表明,试验田栽种的香根草在栽种50 d(10月下旬)和240 d(翌年5月)分蘖株数量迅速增加,栽种270 d时密度最大达到了821株·m-2,但并未对香根草数量增多有明显抑制作用。270 d时(6月初),密度处理为80株·m-2的小区未拔节、拔节和总分蘖株数量与其他密度处理小区差异极显著。各小区地上总生物量与单位面积分蘖株数量呈极显著线性相关。未拔节、拔节、生殖株、总分蘖株数量与初始密度呈极显著幂函数形式正相关。虽然栽种270 d时的密度并未对香根草生长产生制约,但分蘖株数量增长的速率已经显著下降。香根草的繁殖特性决定了其在密度很高的情况下仍能良好生长。A field experiment was conducted to study the responses of ramet characters of wild vetiver （ Vetiveria zizanioides） population to planting density in western Guandong of China. On the 50 d （late October） and 240 d （next May） after planting, the ramet number of the wild veti- ver population increased obviously. On the 270 d after planting, the ramet number under the highest planting density reached the maximum （821 ramets per square meter） , which however had no obvious inhibition effect on the increase of ramet number. On the 270 d （ the beginning of June） after planting, the plot with a planting density of 80 ramets per square meter had signifi- cant differences in the numbers of no-jointed ramet, jointed ramet, and total ramet with the other plots. There was a significant linear correlation between the total biomass and the ramet number per square meter in all plots. The numbers of no-jointed ramet, jointed ramet, sexual ramet, and total ramet had significant positive power function relationships with the initial planting density. Though the planting density did not restrict the vetiver growth on the 270 d after planting, the in- creasing rate of ramet number was decreased obviously. The reproductive characteristics of the vetiver decided that the vetiver could still grow well at high planting density.

关 键 词：香根草 构件 营养株 生殖株 生物量 密度 

分 类 号：Q948.1[生物学—植物学]