太白山佛爷池剖面的全新世环境变化信息

太白山佛爷池海拔3410m,是一个发育在古冰斗中的冰蚀湖。自湖中210cm沉积剖面进行沉积物粒度、孢粉和测年采样分析,表明自8200aBP以来的环境经历了明显的冷暖干湿变化。8200~6800aBP温暖湿润,在7200aBP出现明显增温;6800~5900aBP气候开始波动,大约在6300aBP有一次短暂的变冷,在6000aBP前后出现明显暖期;5900~4800aBP气温下降,大约在5200aBP达到最低,然后气温缓慢回升;4800~2600aBP气候较为温暖湿润,大约在3000aBP达到最高;2600~900aBP气候变冷湿,大约1500aBP达到最低;900aBP~现代变好。 

INFORMATION OF HOLOCENE ENVIRONMENTAL CHANGE FROM LACUSTRIAN DEPOSITS OF THE FOYECHI LAKE SECTION,TAIBAI MOUNTAIN

Foyechi Lake,located at an elevation of 3300 m above sea level,near the summit of Taibai Mountain(3767 m), is an alpine ice-scour lake developed in a bergschrund.A section of 210 cm thick lacustrian deposits in the lake was measured. Analyses of the grain size,sporo-pollen and samples for dating show the climate has undergone marked cold-warm and dry-wel changes since 8200 a BP in the Holocene.The 8200-6800 a BP interval was a warm and humid phase,with temperature increasing significantly at 7200 a BP.The climate fluctuated at 6800-5900 a BP,with a short cooling phase at 6300 a BP,and a significant warming phase at about 6000 a BP.Temperature and precipitation decreased at 5900 a BP,which ended at 5200 a BP with the lowest values.Then the temperatures rose slowly and became warm and humid at 4800-2600 a BP.It is believed that the climate was warmest around 3000 a BP.The climate became cold and wet again at 2600-900 a BP,with the temperatures and precipitation reaching their the lowest values at 1500 a BP.The climate becomes better since 900 a BP.