摘要
为了了解人工栽培条件下象草分株构件生物量及其分配的动态变化规律,以华南象草(Pennisetum purpureum cv.Huanan)为材料,分别在2009年6月和12月,对其分株构件生物量数据进行了测量分析。结果表明:在分株生长过程中,叶片生物量呈线性增长,相关性模型确定系数R2为0.209～0.784;茎秆生物量呈线性或幂函数规律增长,相关性模型确定系数较高,R2为0.687～0.989,茎秆生物量增长规律更为稳定。随着分株总生物量的增长,营养生长期叶片生物量增长速率是生殖生长期的3.39倍;而生殖生长期茎秆生物量增长速率是营养生长期的1.13倍。枯叶生物量在生殖生长期有着较为稳定的线性增长规律,相关性模型确定系数R2为0.471～0.676。花序生物量相关性模型均未达显著水平(P>0.05),花序生物量分配率呈幂值为-1.037的幂函数降低规律。在生殖生长期,叶片和茎秆生物量分配率呈现幂值分别为-0.387和0.093的幂函数变化规律。
In order to understand the variation patterns of Pennisetum purpureum ramets modular growth and biomass allocation under conditions of cultivation, an analysis was made on the modular biomass of P. purpureum ev. Huanan tamers measured in June and December 2009. During the growth process of the ramets, the leaf biomass increased in linear pattern, with the determination coefficient R2 ranged from 0. 209 to 0. 784, and the culm biomass increased in linear or power pattern, with the R2 ranged from 0. 687 to 0. 989, suggesting that the increasing pattern of the culm biomass was much steadier than that of the leaf biomass. With the increase of ramet total biomass, the increasing rate of the leaf biomass in vegetative period was 3.39 times of that in reproductive period. However, the increasing rate of the culm biomass in reproductive period was 1.13 times of that in vegetative period. In reproductive period, the dead leaf biomass increased steadily in a linear pattern, with the determination coefficient R^2 ranged from 0.471 to 0. 676. The correlation models of the inflorescence biomass were all non-significant （P〉0.05） , and the allocation ratio of the inflorescence biomass decreased in a power pattern, with a power value of -1. 037. The allocation ratios of the leaf and culm biomass in reproductive period changed in power pattern, with the power values of -0. 387 and 0. 091, respectively.
出处
《生态学杂志》
CAS
CSCD
北大核心
2011年第9期1875-1880,共6页
Chinese Journal of Ecology
基金
国家自然科学基金项目(30972138和30671489)资助
关键词
象草
分株
构件
生物量分配
相关性模型
Pennisetum purpureum
ramet
module
biomass allocation
correlation model
