拟建新街—恩格阿娄铁路沿线的植被特征

Characteristics of Vegetation along the Proposed Railway from Xinjie to Enge'alou

通过植被群落调查,发现拟建新街—恩格阿娄铁路沿线两侧200 m范围内有常见植物19种,分属8科和17属,主要是禾本科、豆科和菊科植物。沿线植被平均盖度为48%,平均高度58.2 cm,平均生物量为588g/m2。通过比较发现,沿线平原、丘陵干草原平均生物量值高于全市均值,低地盐化草甸平均生物量远低于全市均值,荒漠草原平均生物量与全市均值较为接近。油蒿和柠条是当地抗逆性强、适应性广的物种,在铁路建设的植被恢复过程中,可采用柠条+油蒿的灌草搭配模式进行绿化,来达到防沙固土、恢复和改善铁路沿线生态环境的目的。

The knowledge about present vegetation along the proposed railway is the fundamental step for our performing environmental impacts assessment. We found 19 common species which belong to 8 families and 17 genera, by investigating vegetation community in the two sides of the proposed railway within 200 m. Meanwhile, most of plants belong to Gramineae, Leguminosae and Compositae. The averaged coverage, height and biomass along the railway were 48 %, 58.2 cm and 588 g·m^-2, respectively. The averaged biomasses of the dry steppe in plain or hill, the lowland salinization meadow and the desert steppe were higher than, lower than and close to the averaged biomass value of corresponding grassland type across Ordos, respectively. Considering that ordos wormwood （Artemisia ordosica ） and korshinsk peashrub are widely distributed in local region, we suggested that the combined shrub-herb afforestation model by planting ordos wormwood and korshinsk peashrub together could be used to restore vegetation cover in afforesting area to block sand, conserve soil and improve the eco-environment equality along the railway in future.