关键词: 艾比湖, 胡杨, 树轮年表, 环境意义

Abstract:

Tree-ring samples of Populus euphraticawere collected from three sites at the east of Aibi Lake. Tree-ring width chronologies (STD, RES and ARS)of Aibihua and Dongdaqiao sampling sites were developed, and the features of the chronologies were also analyzed. The chronology spans were 1811—2006 and 1797—2006 respectively. The correlation analysis between standardized width chronologies and temperature and precipitation of Jinghe weather station shows that the correlation is not remarkable. The temperature and precipitation is not the main limiting factor to tree-ring radial growth. Lake level and tree-ring width index show an opposite trend, however, the relation between the chronologies and sandstormdays is remarkable positive. The coefficient between the sandstorm days and the chronologiesof t, t+1, and t+2 reaches 0.31, 0.61 and 0.57, which shows they were controlled by common factors. The groundwater table is about 1.5 to 3 m high and enough to be used by Populus euphratica. On the contrary, at the high lake level period, the groundwater level is accordinglyhigh, which limit the tree growth. When the climate becomeswarm and dry, sandstormis frequent, lake level and groundwater level decrease, and trees grow faster.

Key words: Aibi Lake, Populus euphratica, tree-ring chronology, environmental significance