Table 3.
Mean ± standard error (spatial replication) of measured transparent (net ecosystem exchange, NEE) and dark (ecosystem respiration, R eco) fluxes and estimated budgets of gross primary production (GPP), R eco and NEE during June–August 2008–2014 in Kobbefjord. Superscript letters for the budgets columns, derived from a Tukey’s HSD multiple comparison, indicate significant differences among years. Numbers in parentheses reflect sample size (i.e. number of plots)
| Year | Measurements (mg CO2 m−2 h−1) | Budgets (g C m−2) | |||
|---|---|---|---|---|---|
| NEE | R eco | GPP | R eco | NEE | |
| 2008 | −358 ± 81 | 262 ± 12 | – ± – | – ± – | – ± – |
| 2009 | −497 ± 88 | 216 ± 13 | −252 ± 39abc (14) | 100 ± 5a (16) | −150 ± 40abc (12) |
| 2010 | −496 ± 77 | 288 ± 14 | −244 ± 21ab (18) | 150 ± 7b (18) | −94 ± 17ab (18) |
| 2011 | −86 ± 32 | 236 ± 9 | −104 ± 14a (10) | 110 ± 3a (17) | 7 ± 16a (10) |
| 2012 | −1023 ± 143 | 406 ± 21 | −399 ± 49bcd (13) | 200 ± 10 cd (18) | −216 ± 44bc (13) |
| 2013 | −1164 ± 178 | 425 ± 27 | −424 ± 44 cd (18) | 182 ± 10bc (18) | −242 ± 37bc (18) |
| 2014 | −1119 ± 160 | 479 ± 28 | −505 ± 65d (18) | 231 ± 13d (18) | −274 ± 54c (18) |