祁连山坡地垂直带三种牧草的生长试验

Growth Analysis of Three Representative Forages in Different Vertical Zones of the Southern Foot of East Qilian Mountains

通过盆栽试验,观测分析了祁连山东段南麓坡地3200m-3800m垂直带3种牧草的生长情况。结果表明:中华羊茅(Festuca sinen-sisKeng)仅在3400m处发芽、生长,其他高度上未发芽;垂穗披碱草(Elymus nutansG riseb)和冷地早熟禾(Poa crym ophilaKeng)在不同海拔高度均可发芽、生长。垂穗披碱草和冷地早熟禾地上、地下生物量沿海拔高度的升高而降低,且前者生物量大于后者;两者的植株高度和根系长度随海拔不同而不同,都在3400m处最大,前者大于后者。因此,垂穗披碱草和冷地早熟禾可以作为高寒草原地区推广种植的首选牧草,而中华羊茅生长所需环境相对苛刻,不易在同类环境下生长。

The potted planting experiments of three forages along the vertical zones of the southern foot of east Qilian Mountains were analyzed. The results showed that Festuca sinensis Keng could not germinate and grow at all of the altitudes except in 3400m, while both Elymus nutans Griseb and Poa crymophila Keng completed life history at the different altitudes. Moreover, the aboveground biomass, underground biomass and total biomass of Elymus nutans Grise and Poa crymophila Keng descended with altitudes ascended, and that the biomass of the former species was higher than the latter. Plant height and root length of two forages were different along altitudes ascended, which were highest for both forages in 3400m. Therefore, Elymus nutans Grise and Poa crymophila Keng were the selected as plating forages in the alpine steppes, while Festuca sinensis Keng required rigorous conditions for growth and was difficult to grow in the this area.