【摘要】 为了研究退牧还草项目中围栏封育和种子补播对退化高寒草甸(亚高山草甸和沼泽化草甸)的改良效果,选取"高寒1号"生态组合草种,在青藏高原东部的退化高寒草甸进行了封育和补播试验。对封育和补播后3年的草甸植被高度、盖度和地上生产力进行研究。与对照相比,封育3年的退化亚高山草甸和退化沼泽化草甸的平均植被高度提高49.57%和53.38%,盖度提高24.73%和25.25%,地上生产力提高16.40%和22.17%,物种数没有显著变化。封育后补播"高寒1号"生态组合草种,比封育具有更好的效果。在封育的基础上,补播进一步使两类退化草甸的植被高度分别提高17.64%和15.78%,盖度提高48.38%和50.50%,地上生产力提高3.24%和9.39%,且物种数有一定的增加。围栏封育和草种补播是改良退化高寒草甸的有效途径,封育后补播比只封育更能提高其改良效果。"高寒1号"生态组合草种在退化高寒草甸的补播改良中表现了良好的适应性和显著的效果。更多还原

【Abstract】 In order to study the improvement effects of enclosure and reseeding on degraded alpine meadows(subalpine meadows and swamp meadows), the tests of enclosure and reseeding ’alpine No#1’ ecological mixture grass in degraded alpine meadows of the eastern Qinghai-Tibetan Plateau was conducted. The mean vegetation height and coverage,aboveground productivity of enclosure and reseeding were monitored after three years.Results showed that enclosure significantly increased the average vegetation height(49.57% and 53.38%),coverage(24.73% and 25.25%) and aboveground productivity(16.40% and 22.17%) in degraded subalpine meadows and swamp meadows,but there was no significant difference for species richness compared with the control.Reseeding ’alpine No#1’ ecological mixture grass in fenced meadows had better effects,which could also significantly increased the mean vegetation height(17.64% and 15.78%),coverage(48.38% and 50.50%) and aboveground productivity(3.24% and 9.39%) in these two-type degraded meadows,respectively;an increase in species richness was observed.In conclusion,enclosure and reseeding were all effective improving measures for degraded alpine meadows,and their cooperation would be better than enclosure only.Additionally,the ’alpine No#1’ ecological mixture grass showed favorable adaptability and effect on reseeding and improving degraded alpine meadows.更多还原