Table 4. The effects of different N supplies on integrated carbon gain, potential carbon gain, and carbon loss.

Treatments	Integrated carbon gain (μmol m−2)	Potential carbon gain (μmol m−2)	Carbon loss (%)
High N	42 498 ± 1666 a	57 104 ± 101 a	25.58 ± 2.82 b
Low N	24 938 ± 6507 b	42 574 ± 367 b	41.46 ± 15.03 a

Note: Data are presented as means ± SD with three replications; data followed by different letters are significant at the P < 0.05 level.