Resources Science ›› 2016, Vol. 38 ›› Issue (4): 758-767.doi: 10.18402/resci.2016.04.17

• Orginal Article • Previous Articles     Next Articles

Trends in the tree growing season throughout the Hebei and Shanxi mountainous region and Loess Plateau of North China from 1961 to 2013

GUO Yuanyuan1(), JIANG Yuan1,2(), DONG Manyu1, WEN Yan1, WANG Mingchang1, JIAO Liang1   

  1. 1. College of Resources Science and Technology,Beijing Normal University,Beijing 100875,China
    2. State Key Laboratory of Earth Surface Process and Resource Ecology,Beijing Normal University,Beijing 100875,China
  • Received:2015-02-04 Revised:2016-01-27 Online:2016-04-25 Published:2016-04-25

Abstract:

Based on daily mean temperature measurements at 44 meteorological stations throughout the Hebei Shanxi mountainous region and Loess Plateau region,Northern China from 1961 to 2013,trends in the tree growing season were analyzed in two regions (humid and subhumid). The growing season was defined as the last day of the first 5-day period with a daily mean temperature greater than 5℃ to the last day of the first 5-day period with a mean temperature of less than 5℃. We found that over the last 50 years,the commencement of the tree growing season has increased at a rate of -1.7d/10a,-2.1d/10 and -1.9d/10a,throughout the Hebei Shanxi mountainous region,Loess Plateau region and the whole study area,respectively. The end of the tree growing season has decreased at a rate of 0.9d/10a,1.1d/10a and 1.0d/10a in the three areas,respectively. The length of the tree growing season in the study area increased from 1961 to 2013 at a rate of 2.6d/10a (13.3 days),3.1d/10a (16.4 days)and 2.9d/10a (14.8 days)in the three study areas respectively. Elevation had a strong impact on the tree growing season indices (growing season start,end and length),except for a little effect on commencement of the tree growing season in the Hebei Shanxi mountainous region. Tree growing season indices (start,end and length of the growing season)were associated with spring and autumn temperatures. The spatial distribution of the trend in the commencement of the tree growing season showed a decreasing trend. The end point and length of the tree growing season has increased.

Key words: Hebei Shanxi mountainous region, Loess Plateau, tree growing season, elevation, temperature, trends