【摘要】 试验运用对比方法,对西藏高寒地区初步修复的草地进行放牧试验,调查统计草地杂草的密度、盖度、高度及盖度,分析不同措施下杂草多样性和地上生物量,以探讨其抗牧能力.结果表明:移栽处理植物总密度为405.78株/m~2,低于对照的总密度545.78株/m~2,处理间差异不显著(P>0.05;n=9);移栽处理总盖度为39.56%,是对照的1.41倍,二者差异不显著(P>0.05;n=9);移栽处理总生物量12.08 g/m~2,为对照的1.67倍,差异并不显著(P>0.05;n=9);移栽处理的Shannon-Wiener多样性指数是CK的1.03倍,Pielou均匀度指数是CK的85.33%,Margalef物种丰富度指数是CK的1.33倍,Simpaon多样性指数是CK的1.03倍,均无明显差异(P>0.05;n=9).因此退化草地经移栽封育短期恢复后,其抗牧能力并没有改观,西藏高寒地区重度退化草地应采取长期的恢复措施.更多还原

【Abstract】 The trial of grazing was carried out to explore the grazing resistance of alpine grassland after the short-term restoration in the Tibetan Autonomous Region in 2015. The density, coverage, height, coverage and aboveground biomass of weeds in the grassland were investigated in August of the same year, and the weed biodiversity changes and grassland resistance were analyzed under different treatments. Results showed that the total density of transplanted was 405.78 plants/m~2, which was not significantly different from the CK(P>0.05; n=9). The total coverage of transplant was 39.56 %, which was 1.41 times of the CK, and there was not significant difference from the CK(P> 0.05; n=9). The total biomass of transplanted was 12.08 g/m~2, which was 1.67 times of the CK, and there was not significant difference from the CK(P>0.05; n=9). With being transplanted, the Shannon-Wiener diversity index was 1.03 times of the CK, the Pielou evenness index was 85.33% of the CK, the Margalef species richness index was 1.33 times of the CK and the Simpaon diversity index was 1.03 times of the CK, which were not significantly different(P> 0.05; n=9). In conclusion, the grazing resistance of degraded grassland has not improved after short-term restoration of transplantation and enclosure, and long-term restoration measures should be taken for severely degraded grassland in alpine region of Tibet.更多还原