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| Establishment of Tree-ring Chronology and Response Analysis in Past 100 Years for Ejin Banner, Inner Mongolia |
| LIU Pu-xing1,2, CHEN Fa-hu1, GOU Xiao-hua1, PENG Jian-feng1, HUANG Xiao-zhong1 |
1. Center for Arid Environment and Paleoclimate Research, Key Laboratory of Western China Environment System under Ministry of Education, Lanzhou University, Lanzhou 730000, China;
2. College of Geography and Environment Sciences, Northwest Normal University, Lanzhou 730070, China |
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Abstract After sampling and finishing experimental work, we established the standardized chronology (STD) from tree-ring data of populus euphratica in northwest region of Ejin Banner in Inner Mongolia. The correlations of the tree-ring index with temperature, precipitation of Ejinaqi station and with streamflom of Zhengyixia station were analyzed. The results indicate that there is negative correlation between the tree-ring index and the streamflow of spring and annual, and the correlation coefficient R are 0.642 and 0.525, respectively. The annual precipitation of 37.9 mm is too small to benefit the plant growth in Ejin Banner. So the streamflow become a limiting factor of plant growth. The streamflow through the Zhengyixia gorge, which is large in cold season and small in warm season, does not match with plant growth season. But the streamflow of spring may meet the need of plant growth, although it is only 16.42 percent of the annual streamflow. Because the sampling site is close to riverbed and the level of groundwater is high, so the correlation is significant in biology. The result of response-function analysis between tree-ring index and streamflow indicated that the reconstructed sequence is similar to the observed sequence of streamflow at Zhengyixia station, which proved that the regression function is stabile and believable.
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Received: 13 May 2004
Published: 20 October 2005
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2005, Vol. 25 
