《Table 2 Differences of the mean and maximum values for combinations of starting indices at stations

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

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Note:For the mean differences，the positive and the negative values are counted together；and for the maximum differences，they are counted separately.The negative values in parentheses represent the former index is less than the latter index at some statio

For the five ending indices of the growing season，EI 3（10d<5°C）had the earliest end，and EI 2（>5d<5°C）had the latest end of the growing season，with the difference of 9.4 days for the mean values during the period 1961–2015（Table 3）.Meanwhile，EI 2 had a later end of 1.8 days than EI 1（=5d<5°C），and EI 1 had a later end of 7.6 days than EI 3 averagely.The difference between EI 4（Fr or=5d<5°C）and EI 5（Fr or>5d<5°C）was relatively low（1.1 days）.Two indices including the frost criteria，i.e.，EI 5 and EI 4 had earlier end of the growing season than EI 2 and EI 1，with the differences of 1.3 and 2.0 days for the mean values，respectively（Fig.3）.Therefore，indices including the frost criterion or not can also cause smaller differences than those from the different lengths of the spells in the definition of the ending date of the growing season.