摘要:在西藏措那湖沙害区采用不同物种搭配方式和混播比例对红豆草、紫花苜蓿（三得利）、披碱草、高羊茅进行播种，并在播种当年和第二年生长期结束后对生物量等特性进行分析，旨在找到适合在措那湖沙区植被恢复中可应用的适宜草种及最佳的种植方式。结果表明：1）播种当年混播方式对两种禾本科植物披碱草和高羊茅的株高、根长影响不显著，但会使两种豆科植物红豆草和紫花苜蓿的株高增加；2）混播方式对草地单位面积的生物量有明显的影响，豆禾草种混播处理中生物量会随着豆科植物比例的减小而增加，播种当年披碱草单播及披碱草+高羊茅（5：5）的混播处理有较高的生物量，分别为（756.33±96.29） g/m²、（720.25±35.63） g/m²，次年披碱草单播及披碱草＋高羊茅（7：3）的处理总生物量最高分别为（832.13±124.71） g/m²、（723.83±57.14） g/m²；3）披碱草+高羊茅3个混播比例的处理两年中均表现出较高的盖度，其中播种当年披碱草+高羊茅（5：5）的处理盖度最大为87%，次年盖度均达到60%以上；4）在高寒气候下的混播草种实验中，禾本科植物对草地恢复的贡献要明显大于豆科。



Abstract:This paper aimed to find the suitable herbaceous species and their planting modes for grassland restoration in the desertification area in Tibet. We conducted seeding experiments of four herbaceous species, i.e., Onobrychis viciifolia, Medicago sativa, Elymus dahuricus, and Festuca elata, with different mixing modes and mixing seed amount ratios in desertificated grassland around Cuona Lake, and measured some plant growth indices such as biomass per area for two consecutive years. Results showed that:1) effects of mixing modes on plant height and root length were not significant in the first year for two gramineous species, i.e., E. dahuricus and F. elata, however, plant height of two leguminous species, i.e., O. viciifolia and M. sativa, were significant higher in mixing-plots than in mono-plots. 2) Mixing modes significantly affected the biomass per area in the sowing plots, with biomass of mixing plots increased with decrease of the leguminous plants ratio. The biomass of the best sowing modes were (151.27±15.26) g/m² (E. dahuricus monoculture) and (144.05 ±7.13) g/m² (E. dahuricus+F. elata, 5:5) respectively for the first year, while (832.13±124.71) g/m² (E. dahuricus monoculture) and (723.83±57.14) g/m² (E. dahuricus+F. elata, 7:3) for the second year, respectively. 3) Plant coverage for mixing modes of the two gramineous species were consistently high during the two years, with the maximum coverage of 87% occurred in the first year and over 60% in the second year for E. dahuricus+F. elata (5:5). 4) Gramineous species contributed more biomass per area than leguminous species in grassland restoration under alpine climate.





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