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March to June Runoff of Heihe River since {1 770} Reconstructed from Tree-Ring Data

WANG Ya-jun~1, CHEN Fa-hu~2, GOU Xiao-hua~2(1.Department of Resources Science, Hebei Institute of Architectural Science and Technology, Handan Hebei 056038, China;2.Department of Geography Science, Lanzhou University, Lanzhou Gansu 730000, China)  
In this paper, the relationship between tree-ring of %Picea Crassifolia% in the middle section of the Qilian Mountains and runoff of the Heihe River is studied. Tree-ring width correlates most significantly to March to June runoff.Using well-replicated tree-ring data from %Picea crassifolia% in the Qilian Mountains, March to June runoff of the Heihe River has been reconstructed for the period from 1770 to 1995.Cross-verification testing of the reconstruction passes significance tests. Sign tests of the reconstructed series and the observed series are made, and product mean and error reduction are calculated, which prove that the reconstruction is reliable.The reconstructed March to June runoff shows that the Heihe River has experienced obvious high and low water periods, mainly in a high water state, since 1770. Now, it is in a low water period and seems to be lower and lower. Moreover, the low water periods are well corresponding to the recorded drought disasters periods. Periods of 24 and 3 a have been seen in the reconstructed runoff series since 1770.
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