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 |