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Table 4 Growing season sums of net ecosystem exchange (NEE), ecosystem respiration (ER) and gross primary productivity (GPP), NEEmax is the peak of NEE in the growing season, ERmax is the maximum value of ecosystem respiration in the growing season, GPPmax is the maximum value of GPP in the growing seasons

From: Drivers of carbon flux in drip irrigation maize fields in northwest China

Year Growing days NEE ER GPP NEEmax ERmax GPPmax
(Day) (g C m−2) (g C m−2) (g C m−2) (g C m−2) (g C m−2) (g C m−2)
2014 134 − 630.13 485.46 1115.54 − 14.32 7.6 20.83
2015 132 − 729.89 975.46 1705.3 − 18.69 14.67 26.79
2016 144 − 601.18 825.81 1427.05 − 13.67 9.98 21.31
2017 142 − 406.76 661.84 1068.63 − 10.98 8.77 18.99
2018 146 − 527.47 724.94 1252.35 − 11.42 9.14 17.94
Mean 139.6 − 579.09 734.7 1313.77 − 13.82 10.03 21.17
SD 5.57 107.89 163.58 232.07 2.75 2.44 3.06
CV 0.04 − 0.19 0.22 0.18 − 0.20 0.24 0.14
  1. SD standard deviation, CV coefficient of variation