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Arid Land Geography ›› 2020, Vol. 43 ›› Issue (4): 955-966.doi: 10.12118/j.issn.1000-6060.2020.04.11

• Climatology and Hydrology • Previous Articles     Next Articles

Reconstruction of spring dry and wet changes in Taibai Mountain area based on tree ring width

QI Gui-zeng1,2, BAI Hong-ying1,2, MENG Qing1,2, ZHAO Ting1,2, GUO Shao-zhuang1,2   

  1. 1 College of Urban and Environmental Science,Northwest University,Xi’an 710127,Shaanxi,China;
    2 Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity,Xi’an 710127,Shaanxi,China
  • Received:2019-04-24 Revised:2020-06-06 Online:2020-07-25 Published:2020-11-18

Abstract: Qinling Mountains is considered the climatic boundary of China. It contains an important water source of the middle region of the south-to-north water diversion. Taibai Mountain is the highest peak in the region. Understanding the characteristics of past dry-wet changes in the Taibai Mountain area is of great importance for the study of the climate change mechanism and the sustainable use of water resources in the future. This study reconstructed the standardized precipitation evapotranspiration index (SPEI) value of the spring of 1852–2016 (3–5 months) based on the data retrieved from the Larix chinensis tree-ring widths in the Taibai Mountain area in the Qinling Mountains and the meteorological data (1959–2016) obtained from the nearby Baoji and Meixian meteorological stations. The results indicated as follows:(1) the radial growth of Larix chinensis in Taibai Mountain is mainly limited by spring climate change;as it exhibited the highest correlation with spring SPEI value,reaching–0.72 (P<0.01),and the reconstruction captured 51.8% (51.0% after adjusting the degree of freedom) of the SPEI variance. (2) Among the past 165 years,29 years were wet years and 23 years were drought years,accounting for 17.58% and 13.94%,respectively,of the total. The extreme drought years were identified to be 1892,1929,1945,and 2006 CE and the extreme wet years were 1881,1921,and 1990 CE. The driest and wettest years were 1892 CE (–1.73) and 1881 CE (1.53),respectively. (3) The reconstructed SPEI values was found to be in agreement with the reconstruction results of the wet and dry changes in the surrounding areas and with the historical records of the disasters. The dry and wet changes in Taibai Mountain can accurately characterize the dry and wet changes in large areas and show cyclical changes of 8.4,3.8,3.1,and 2.5 years. The SPEI in the Taibai Mountain area was found to be positively correlated with the western Pacific Sea surface temperatures and negatively correlation with those of the eastern Pacific. The dry and wet changes were found to be related to the El Niño-Southern Oscillation (ENSO) activities.

Key words: the Taibai Mountain, Larix chinensis, tree-rings width, spring, SPEI