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JOURNAL OF DESERT RESEARCH ›› 2016, Vol. 36 ›› Issue (1): 206-215.DOI: 10.7522/j.issn.1000-694X.2016.00006

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The Water Allocation History and Its Ecological Impacts Recorded in Populus euphratica Tree Ring in the Lower Reaches of the Heihe River around the 1940s

Peng Xiaomei1,2, Xiao Shengchun1, Cheng Guodong1, Xiao Honglang1, Tian Quanyan1,2   

  1. 1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2015-12-14 Revised:2016-01-04 Online:2016-01-20 Published:2016-01-20

Abstract: It is one of the most important events recorded in the historical documents that the water allocation between the West and East River in the lower reaches of the Heihe River around the 1940s. What is the impact of this event on the local riparian forest growth? In the present study, we developed 28 tree-ring chronologies of Populus euphratica in the Ejina Oasis to evaluate the oasis-scale poplar riparian forest growth variation influenced by this water allocation event. During 1945-1950, the overall radial growth along the East River decreased by 46%, and the growth along the West River increased by 16% compared with the average during 1954-1989. During 1900-2010, the minimum values of oasis-scale radial growth were 0.72 in 1948. Therefore, the oasis-scale poplar riparian forest growth could not benefit from the centralized water supply. In a hyper-arid riparian area, the stem radial growth of poplar trees in the oasis showed high spatial heterogeneity, because of heavy impact of human activity on the riparian forests and spatial heterogeneity of moisture limiting factor.

Key words: radial growth, riparian forest, Heihe River, dendrochronology

CLC Number: