Table 1 Differences (manipulation—control, given as mean ± standard deviation) in temperature and soil moisture during the different phases of the experiment
|  | Air temperature difference (°C) | Soil temperature difference (°C) | Soil moisture difference (%vol) | ||||||
|---|---|---|---|---|---|---|---|---|---|
SA | HD | SC | SA | HD | SC | SA | HD | SC | |
Period 1 | |||||||||
 2008 summer drought | 1.15 ± 2.179 | 0.32 ± 2.178 | 0.53 ± 2.433 | 0.84 ± 1.617 | −0.032 ± 0.494 | 0.075 ± 0.623 | −20.1 ± 6.53 | −9.3 ± 3.67 | −7.8 ± 2.40 |
 2009 spring warming | 0.69 ± 1.310 | 0.39 ± 0.607 | 0.36 ± 0.619 | 0.45 ± 0.818 | 0.30 ± 0.585 | 0.20 ± 0.464 | * | * | * |
Period 2 | |||||||||
 2009 summer drought | 0.62 ± 1.333 | 1.30 ± 2.694 | 0.64 ± 1.332 | −0.30 ± 0.601 | −0.50 ± 1.420 | −0.19 ± 0.452 | −20.0 ± 5.24 | −18.8 ± 12.48 | −7.5 ± 2.91 |
 2010 spring warming | 1.00 ± 1.474 | 0.47 ± 0.713 | 0.60 ± 0.866 | 0.68 ± 0.777 | 0.28 ± 0.235 | 0.39 ± 0.204 | * | * | * |