在高寒地区，通过建植多年生禾草混播草地来提高草地生产力的生产模式是可行且有效的。
In alpine region, it is feasible and effective to improve the productivity by establishing mixed artificial perennial grassland.
结果表明：1.在高寒地区，通过建植多年生混播禾草人工草地可达到提高草地生产力的目的。
The results indicate: 1. In alpine region, the productivity of the grassland can be improved by establishing mixture grassland of cultivated perennial grasses.
植硅体组合在4个主要的火山灰层都发生了明显的变化，表现在树木和灌木的急剧下降及禾草类和莎草科的繁盛。
Significant changes in phytolith assemblages occur at the same depth as four major tephra. indicating a sharp decline in trees and shrubs and a surge in grass and Cyperaceae.
植硅体组合在4个主要的火山灰层都发生了明显的变化，表现在树木和灌木的急剧下降及禾草类和莎草科的繁盛。
Significant changes in phytolith assemblages occur at the same depth as four major tephra. indicating a sharp decline in trees and shrubs and a surge in grass and Cyperaceae.
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