Table 3.
Weighted mean (±SE) cumulative microbial respiration (Rcum, Mmol C d−1) for US streams and rivers. Ecoregiona and stream size class sums for are also presented.
| Stream size class | CPL | NAP | SAP | NPL | SPL | TPL | UMW | WMT | XER | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Size class sums |
||||||||||||
| Rcum | Headwaters | 15.1 | 287 | 3.84 | 0.63 | 0.18 | 6.07 | 90.8 | 104 | 32.1 | 540 | |
| (7.47) | (84.6) | (0.74) | (---) | (0.19) | (1.12) | (72.6) | (44.0) | (17.4) | (228) | |||
| Streams | 473 | 93.5 | 9.60 | 6.57 | 1.55 | 11.3 | 19.1 | 5.45 | 18.5 | 639 | ||
| (131) | (70.6) | (4.03) | (2.67) | (1.06) | (4.91) | (9.78) | (2.84) | (7.88) | (233) | |||
| Small rivers | 10.8 | 25.4 | 10.1 | 3.82 | 4.24 | 13.9 | 55.3 | 130 | 70.3 | 324 | ||
| (6.39) | (9.14) | (2.50) | (1.28) | (1.80) | (6.40) | (14.4) | (102) | (40.8) | (183) | |||
| Big rivers | 7.95 | 13.5 | 36.1 | 22.7 | 2.28 | 110 | 6.74 | 18.3 | 14.3 | 232 | ||
| (3.33) | (5.53) | (11.0) | (6.80) | (0.65) | (55.6) | (2.66) | (5.09) | (5.98) | (96.6) | |||
| Great rivers | 19.9 | --- | 6.39 | 1.52 | 4.32 | 123 | 21.6 | 0.01 | 0.31 | 177 | ||
| (21.8) | (---) | (2.86) | (0.65) | (3.65) | (71.4) | (8.93) | (---) | (0.06) | (109) | |||
| Ecoregion sums | 527 | 419 | 66.0 | 35.2 | 12.6 | 264 | 194 | 258 | 136 | Gr. Sum | 1912 | |
| (170) | (170) | (21.1) | (11.4) | (7.35) | (135) | (108) | (154) | (72.1) | (849) | |||
a
Coastal Plains (CPL); Northern (NAP) and Southern (SAP) Appalachian Mountains; Northern (NPL), Southern (SPL), and Temperate (TPL) Plains; Upper Midwest (UMW); Western Mountains (WMT) and the Xeric west (XER).