《Table 5 Changes in the regional averaged growing season indices during the period 1961–2015 in nort

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《Variations of the thermal growing season during the period 1961–2015 in northern China》

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For all 877 stations，the averaged changes in four starting indices of the growing season ranged from–11.3 to–10.1 days during 1961–2015（Table 5）.Statistics showed that there were 608，602，586 and 576 stations with significant advancing rates of 1.0–5.5 days per decade for SI 1，SI 2，SI3 and SI 4，accounting for 69.3%，68.6%，66.8%and 65.7%of the total stations across northern China，respectively，of which there were 54.4%，56.0%，56.6%and 56.3%of stations with significant advancing rates of 1.0–3.0 days per decade，respectively.Areas with significant advance of the growing season reduced gradually from SI 1 to SI 4（Fig.5）.None of station had significant later onset of the growing season for all four indices.Indices including the frost criteria brought about changes of 1.0 day less than those disregarding frost criteria on average.