HUBEI AGRICULTURAL SCIENCES ›› 2020, Vol. 59 ›› Issue (14): 45-51.doi: 10.14088/j.cnki.issn0439-8114.2020.14.008

• Resource & Environment • Previous Articles     Next Articles

Analysis of the periodic change and trend of agro-climatic resources in Bei'an city based on Morlet wavelet

XU Ming-yuan1, WANG Hai-ning2, XU Wen-long3   

  1. 1. College of Land and Environment,Shenyang Agricultural University,Shenyang 110000,China;
    2. Tieli Meteorological Buearu, Tieli 152500,Heilongjiang,China;
    3. Bei'an Meteorological Buearu,Bei'an 164000,Heilongjiang,China
  • Received:2019-12-10 Online:2020-07-25 Published:2020-09-14

Abstract: Based on the 1959—2019 meteorological data of the national basic meteorological stations, farm meteorological stations and regional meteorological stations in Bei'an city, Heilongjiang province, using Matlab to make wavelet analysis chart for cycle analysis, using one-dimensional linear fitting and quadratic polynomial fitting for linear trend analysis, the agricultural climate resources affecting crop growth in Bei'an city for nearly 61 years were analyzed. The results showed that the temperature fluctuation in the growing season of crops in Bei'an city had shown an overall rising trend in recent 61 years, while the accumulated temperature had shown a significant upward trend, rising slowly at the rate of 70 (℃·d) every 10 years, which had been at a higher level since 2000,and the accumulated temperature increase made the heat resources showing an overall increasing trend. The precipitation showed no significant decreasing trend. The wavelet analysis showed periodic changes in monthly and total precipitation of the growing season, and the sunshine hours showed periodic changes, and the linear trend slightly decreased. The change trend of the first frost day was delayed year by year, and the change trend of the final frost day was advanced year by year. The number of frost-free days showed periodic changes, and the overall trend showed an increasing trend.

Key words: crop growth period, agroclimatic resources, wavelet analysis, trend analysis, Bei'an city

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