白羊草无性系构件的结构及生长规律

Structure and growth regulation of Bothriochloa ischaemum clone modules

本研究采用大样本随机挖取单个无性系株丛的方法在伊犁河谷特克斯县境内的典型白羊草(Bothriochloaischaemum)草地进行取样,并定量分析了白羊草无性系构件结构及其生长规律。结果表明,在籽实成熟期,白羊草无性系的平均丛径为13.5cm。在无性系中,生殖分株与营养分株分别占总分株的27.9%和72.1%,而生殖分株与营养分株的生物量则分别是无性系总生物量的50.6%和49.4%。随着丛径的增加,白羊草无性系不同构件数量和生物量及总分株数量和分株总生物量均呈指数函数关系的异速增长。营养分株数量和生物量与总分株数量及总生物量之间呈幂函数关系,而生殖分株数量和生物量与总分株数量及分株总生物量之间均呈线性相关关系。

Large samples of Bothriochloa ischaemum clones were collected from the mountain grassland in Tekesi County of Yili River Valley to quantitatively analyze the structure and growth patterns of their modules, by randomly digging up whole ramet tuft. The results showed that the average tuft size of clones during its growth stopping period was 13.5 cm, the individuals of reproductive and vegetative tillers occu- pied 27.9% and 72. 1% of total respectively, and at the same time, the biomass of reproductive and vege- tative tillers occupied 50.6% and 49.4% of total, respectively. With the increasing of tuft size, number and biomass of different tillers, number of total tillers and biomass of tillers of B. ischaernurn clones were in exponential allometry growth, number and biomass of vegetative tillers were in a positively power func- tional retationshiped with the number and biomass of total tillers, and number and biomass of reproductive tillers were positively correlated with either number or biomass of total tillers.