中文摘要：

象草是华南地区优良牧草,是典型的无性系植物。以MT-1、Mott、Huanan、N51和Guimu No.1象草为试验材料,通过2007-2009年3年的刈割试验,对其构件生物量及分配动态变化进行了研究。结果表明,营养生长期,5个品种（系）茎秆生物量分配比重和叶片生物量分配比重为各构件比重中最高及次高,这与植株扩大叶片面积和增加叶片数量,增加光合产物有关。从营养生长期到生殖生长期,各象草品种（系）叶片生物量降低,枯叶生物量和茎秆生物量增加,呈现彼此消长的动态变化;基部3节生物量及其分配比重降低,茎秆生物量及其分配比重增加,二者亦出现彼此消长的变化。

英文摘要：

Elephant grass（Pennisetum purpureum）,a valuable forage in south China,is a typical clonal plant.Modular theory was used to analyze the characteristics and dynamics of modular biomass and its allocation ratio in five elephant grass cultivars（MT-1,Mott,Huanan,N51 and Guimu No.1） from 2007 to 2009,with six harvests.The allocation ratios of culm and leaf blade were the highest and second highest respectively of the modules which contributed to the accumulation of photosynthate in the vegetative growth period.From vegetative growth to reproductive growth,the leaf biomass diminished but dead leaf biomass and culm biomass increased.Similarly,the biomass of three internodes of the culm base and its allocation ratio reduced while the culm biomass and its allocation ratio increased.