Feng Li, Li Xin-Rong, Guo Qun, Zhang Jing-Guang, Zhang Zhi-Shan
Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China.
Ying Yong Sheng Tai Xue Bao. 2011 May;22(5):1114-20.
Aimed to examine the effects of highway on the vegetation species composition in arid desert area, forty-eight transects perpendicular to the provincial highway 201 from Shapotou to Jing-tai in the southeastern margin of Tengger Desert were installed, with the vegetation species distribution along a distance gradient from the road edge investigated. The results showed that with increasing distance from the road edge, the species number, coverage, biomass, and alpha-diversity of herbaceous plants declined, but had no significant differences with the control beyond 5 m. Within 0-6 m to the road edge, the herbaceous plant height was greater than that of the control, but their density had less change. Within 0-2 m to the road edge, the species turnover rate of herbaceous plants was lower; at 2-5m, this rate was the highest; while beyond 10 m, the species composition of herbaceous plants was similar to that of the control. The herbaceous plant community at the road edge was dominated by gramineous plants, with the disturbance-tolerant species Pennisetum centrasiaticum, Chloris virgata, and Agropyron cristatum accounting for 68.6% of the total. C. virgata beyond 1 m to the road edge had a rapid decrease in its individual number and presence frequency, P. centrasiaticum and A. cristatum beyond 2 m also showed a similar trend, while the composite plants Artemisia capillaris and A. frigida beyond 2 m from the road edge had a rapid increase in its individual number, accounting for 70% of the herbaceous plants. At the road edge, the coverage and density of shrubs were significantly lower than those of the control, but the species composition had no significant difference.
为研究公路对干旱沙漠地区植被物种组成的影响，在腾格里沙漠东南缘设置了48条垂直于省道201（从沙坡头至景泰段）的样带，调查了沿道路边缘距离梯度的植被物种分布。结果表明，随着距道路边缘距离的增加，草本植物的物种数、盖度、生物量和α多样性下降，但在距道路边缘5米以外与对照无显著差异。在距道路边缘0 - 6米范围内，草本植物高度高于对照，但其密度变化较小。在距道路边缘0 - 2米范围内，草本植物的物种周转率较低；在2 - 5米处，该周转率最高；而在10米以外，草本植物的物种组成与对照相似。道路边缘的草本植物群落以禾本科植物为主，耐干扰物种沙生冰草、虎尾草和披碱草占总数的68.6%。距道路边缘1米以外的虎尾草个体数和出现频率迅速下降，2米以外的沙生冰草和披碱草也呈现类似趋势，而距道路边缘2米以外的菊科植物茵陈蒿和冷蒿个体数迅速增加，占草本植物的70%。道路边缘灌木的盖度和密度显著低于对照，但物种组成无显著差异。
