Table 5.
Mean values (±SE) of dry mass of rhizomes, roots, and total below-ground biomass (TBB) under different amounts of precipitation (dry, ambient and wet treatments) recorded in five years (2006–2010): results of one-way ANOVA analysis (NS: not significant, *P < 0.05, **P < 0.01, ***P < 0.001). Different letters denote significantly different values for rhizomes, roots and total separately (Tukey HSD test (P < 0.05) after ANOVA).
| Year | Rhizomes | Roots | TBB | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry | Amb | Wet | P | Dry | Amb | Wet | P | Dry | Amb | Wet | P | |
| Lowland grassland | ||||||||||||
|
| ||||||||||||
| 2006 | 225 ± 33a | 219 ± 26a | 169 ± 26a | NS | 830 ± 34a | 732 ± 52a | 854 ± 81a | NS | 1056 ± 56a | 951 ± 56a | 1022 ± 99a | NS |
| 2007 | 165 ± 31a | 163 ± 23a | 186 ± 35a | NS | 654 ± 39a | 881 ± 75b | 919 ± 53b | ** | 818 ± 47a | 1045 ± 86b | 1104 ± 72b | * |
| 2008 | 142 ± 25a | 192 ± 44a | 349 ± 62b | * | 829 ± 54a | 917 ± 112a | 764 ± 41a | NS | 971 ± 40a | 1109 ± 118a | 1076 ± 72a | NS |
| 2009 | 192 ± 26a | 131 ± 29a | 180 ± 41a | NS | 725 ± 71a | 813 ± 68a | 679 ± 67a | NS | 917 ± 74a | 943 ± 71a | 859 ± 94a | NS |
| 2010 | 109 ± 20a | 166 ± 25a | 321 ± 122a | NS | 729 ± 115a | 1043 ± 103a | 953 ± 154a | NS | 928 ± 109a | 1208 ± 118a | 1294 ± 205a | NS |
|
| ||||||||||||
| Highland grassland | ||||||||||||
|
| ||||||||||||
| 2006 | 367 ± 57a | 464 ± 107a | 565 ± 82a | NS | 1549 ± 96a | 1609 ± 72ab | 1854 ± 94b | * | 1916 ± 124a | 2074 ± 171ab | 2419 ± 142b | * |
| 2007 | 236 ± 44a | 347 ± 48ab | 419 ± 72b | * | 961 ± 99a | 1282 ± 117b | 1360 ± 100b | * | 1197 ± 124a | 1629 ± 149b | 1779 ± 135b | * |
| 2008 | 300 ± 26a | 421 ± 98a | 989 ± 310b | * | 1009 ± 124a | 1403 ± 56b | 1368 ± 104b | * | 1309 ± 121a | 1824 ± 125b | 2357 ± 294b | ** |
| 2009 | 276 ± 55a | 754 ± 159b | 680 ± 166b | * | 1146 ± 131a | 1179 ± 86a | 1313 ± 129a | NS | 1422 ± 180a | 1932 ± 158ab | 1993 ± 205b | * |
| 2010 | 503 ± 148a | 449 ± 138a | 568 ± 108a | NS | 1185 ± 104a | 1198 ± 90a | 1651 ± 118b | ** | 1641 ± 215a | 1647 ± 194a | 2112 ± 218a | NS |
|
| ||||||||||||
| Mountain grassland | ||||||||||||
|
| ||||||||||||
| 2006 | 401 ± 102a | 499 ± 82a | 486 ± 76a | NS | 1365 ± 116a | 1519 ± 111a | 1568 ± 211a | NS | 1766 ± 151a | 2018 ± 94a | 2054 ± 184a | NS |
| 2007 | 422 ± 114a | 526 ± 76a | 511 ± 92a | NS | 982 ± 75a | 954 ± 70a | 1015 ± 125a | NS | 1404 ± 103a | 1479 ± 112a | 1526 ± 113a | NS |
| 2008 | 317 ± 97a | 434 ± 78a | 457 ± 68a | NS | 855 ± 82a | 947 ± 61ab | 1114 ± 56b | * | 1172 ± 96a | 1380 ± 134ab | 1571 ± 111b | * |
| 2009 | 330 ± 77a | 381 ± 92a | 383 ± 94a | NS | 888 ± 52a | 1167 ± 49b | 1154 ± 76b | ** | 1218 ± 105a | 1548 ± 121a | 1536 ± 157a | NS |
| 2010 | 227 ± 48a | 356 ± 61a | 322 ± 55a | NS | 1372 ± 91a | 1318 ± 90a | 1429 ± 53a | NS | 1599 ± 130a | 1674 ± 141a | 1751 ± 48a | NS |