气候变化对青藏高原高寒草甸优势植物物候期的影响

Effect of climate change on the phenophase of dominant plants in alpine meadow of Qinghai-Tibet plateau

为了探讨青藏高原草地对气候变化的响应,试验对1993—2005年青藏高原高寒草甸优势植物的物候期进行了分析。结果表明:高寒草甸4个优势种的返青期发生显著变化,主要受3月份气温和4月份日照时数的影响;枯黄期主要受8月份日照和气温、9月份日照和气温的影响。影响生育期的因子较多,主要受3,5,8月份平均气温和9月份平均降水量的影响。4种优势植物的返青期较接近,但是枯黄期和生育期相差较大。

To investigate the response of grassland of to climate change in the Qinghai - Tibet plateau, the phenophase of dominant plants in al- pine meadow of Qinghai - Tibet Plateau from 1993 to 2005 was analyzed. The results showed that four dominant plants in alpine meadow had a significant change in the regreening stage, which was mainly affected by the air temperature in March and sunshine duration in April. The turn- ing yellow stage of four dominant plants was mainly affected by sunshine duration and temperature in August and September. There were more factors affecting the growth period of four dominant plants, which was mainly affected by the average air temperature in March, May and August as well as the average precipitation in September. The regreening stage of four dominant plants was very close, while there were great difference in the turning yellow stage and growth period.