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Analysis of Precipitation Characteristics during 1957-2012 in the Semi-Arid Loess Plateau, China

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  • Weijun Zhao
  • Xinyang Yu
  • Huan Ma
  • Qingke Zhu
  • Yan Zhang
  • Wei Qin
  • Ning Ai
  • Yu Wang

Abstract

Precipitation is the only water supply and most important factor affecting vegetation growth on the slopes of semi-arid Loess Plateau of China. Based on precipitation data from 7 synoptic stations in the study area over the period 1957–2012, the trends of precipitation and standardized precipitation index (SPI) were analyzed by using linear regression, Mann−Kendall, and Spearman’s Rho tests at the 5% significance level. The results show that (1) the precipitation fluctuation of monthly precipitation was intense (coefficients of variation> 100%), and the drier years were recorded as 1965 and 1995 at all stations. (2) The significant change trend of different stations varied on different time scales: the Changwu station had a significant decreasing trend in April (−0.488 mm/year) and November (−0.249 mm/year), while Luochuan station was in April (−0.457 mm/year); Changwu station displayed a significant increasing trends in winter (0.220 mm/year) and a significant decreasing trends in spring (−0.770 mm/year). The significant decreasing trends in annual precipitation were detected at the Suide (−2.034 mm/year) and Yan’an (–2.129 mm/year) stations. (3) The SPI−12 series analysis suggests that the drought degree of Yulin and Changwu was the lowest and that of Hengshan was the highest among the 7 synoptic stations.

Suggested Citation

  • Weijun Zhao & Xinyang Yu & Huan Ma & Qingke Zhu & Yan Zhang & Wei Qin & Ning Ai & Yu Wang, 2015. "Analysis of Precipitation Characteristics during 1957-2012 in the Semi-Arid Loess Plateau, China," PLOS ONE, Public Library of Science, vol. 10(11), pages 1-13, November.
    • Handle: RePEc:plo:pone00:0141662
    DOI: 10.1371/journal.pone.0141662
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    References listed on IDEAS

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    1. Ana Paulo & Luis Pereira, 2008. "Stochastic Prediction of Drought Class Transitions," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 22(9), pages 1277-1296, September.
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    Cited by:

    1. Xingkai Zhao & Zengyao Li & Qingke Zhu & Danhong Zhu & Huifang Liu, 2017. "Climatic and drought characteristics in the loess hilly-gully region of China from 1957 to 2014," PLOS ONE, Public Library of Science, vol. 12(6), pages 1-28, June.

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