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为了研究气候变化对草地不同冠层植物的影响,试验对1997—2005年青海湖草甸化草原不同冠层三种禾本科植物(西北针茅、洽草、冷地早熟禾)的生育期物候和生产力数据进行分析。结果表明:不论是枯黄期还是生育期,草地上层植物的物候反应比下层明显。上层草地物候期的响应速率均大于下层植物;但生产力没有明显的变化趋势,下层植物的生产力呈现出增加趋势。说明物候期能够很好地指示生态系统对环境变化的响应,不同冠层植物的生产力对物候期的响应有所不同。
In order to study the effect of climate change on different canopy plants in grassland, the growth phenology of three gramineous plants (Stipa koreana, Sycamore shrub, and Poa pratensis) in different canopy layers of meadow grassland of Qinghai Lake from 1997 to 2005 was studied. And productivity data for analysis. The results showed that the phenological response of the upper grass plant was obviously lower than that of the lower layer, no matter in the period of yellowing or growth. The responses of the upper grassland phenophase were greater than that of the lower grasshopper. However, there was no obvious change in productivity and the productivity of the lower plants showed an increasing trend. It indicates that the phenology period can well indicate the response of the ecosystem to environmental changes. The productivity of different canopy plants responds differently to the phenophase.