白羊草种群繁殖的数量特征  

Quantitative Characters of Vegetative Multiplication of Bothriochloa ischaemum Populations

作　　者：董宽虎[1] 米佳[1] 

机构地区：[1]山西农业大学动物科技学院,山西太谷030801

出　　处：《草地学报》2006年第3期210-213,共4页Acta Agrestia Sinica

基　　金：山西省自然科学基金(971093)

摘　　要：于抽穗-开花期测定分析白羊草(Bothrioch loaischaemum)株丛的繁殖数量特征。结果表明:丛茎枝数、丛地上生物量和丛生殖枝数分别随丛径呈指数函数增加,丛生殖枝重随丛径呈幂函数增加,丛地上生物量与丛茎枝数,以及丛生殖枝重与丛生殖枝数之间均呈线性增加,生殖枝数和营养枝数比值随株丛高度和丛径均呈二次曲线变化。Bothriochloa ischaemum is a perennial grass species. In the Shanxi rangelands, the population reproduction is mainly by vegetative multiplication. Tuft size is a decisive factor that determines many of the quantitative characters of population reproduction. The values of the grass quantitative characters have high pertinence with the tuft size. Through investigation and measurement of many samples from independent tufts and random samples from normal spikes in a single dominant community, the quantitative characters of sexual reproduction and vegetative multiplication of Bothriochloa ischaernum populations in Shanxi rangelands were analyzed. The results show that there was an obvious regularity with the quantitative characters of vegetative multiplication of the Bothriochloa ischaemum populations. The tiller number, aboveground biomass, and number of reproductive tillers of the tuft increased exponentially with its expanding size. The weight of reproductive tillers of the tuft rose with its spreading size power-functionally. There existed a significant positive linear correlation between the tuft aboveground biomass and its tiller number, and that between the number and the weight of reproductive tillers. The ratio between the number of reproductive and of vegetative tillers of the tuft changed conically with the tuft mean height and size.

关 键 词：白羊草 种群 繁殖 数量特征 

分 类 号：S543.9[农业科学—作物学] S812