title: Tree-ring hydrologic reconstructions for the Heihe River watershed, western China since AD 1430.
abstract: Based on the tree-ring-width analysis, the total precipitation from previous July to current June of the Qilian Mountains from 1634 to 2000 AD and the average runoff from previous September to current June in the middle section of the Heihe River from 1430 to 2007 have been reconstructed. This allowed detailed examination of the hydrologic history of the watershed of the Heihe River in western China. Precipitation, runoff and groundwater level were found to be significantly correlated with each other on the decadal scale. The three curves display quite synchronous trends of natural variation before AD 1940 to present before the onset of man-made disturbances. A remarkable period is AD 1925-1940 when the precipitation is low in the upper section, the runoff decreases in the middle section, and the groundwater level declines in the downstream section. After 1940, the groundwater level shows a lag effect, which may be a result of high water consumption in the middle and downstream sections. All three tree-ring based hydrologic indices commonly display the most significant periodicities around 80 (78-82), 50 (49-58) and 2 year. These cycles correspond to large-scale oscillation found in the climate system and appear mainly related to ocean-atmosphere interaction.
authors.affiliation: The State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China. liuyu@loess.llqg.ac.cn
authors.forename: Yu
authors.initials: Y
authors.lastname: Liu
authors.forename: Junyan
authors.initials: J
authors.lastname: Sun
authors.forename: Huiming
authors.initials: H
authors.lastname: Song
authors.forename: Qiufang
authors.initials: Q
authors.lastname: Cai
authors.forename: Guang
authors.initials: G
authors.lastname: Bao
authors.forename: Xuxiang
authors.initials: X
authors.lastname: Li
mesh_terms: D002681:China; D002980:Climate; D049668:History, 15th Century; D049669:History, 16th Century; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D049674:History, 21st Century; D011891:Rain; D045483:Rivers; D014197:Trees