3.1 Soil microclimate and soil N availability
Averaged across the three consecutive years, experimental warming by
OTCs significantly increased upper (0-10 cm) soil temperature by 1.1
oC, increased soil inorganic N by 10.% (Fig. 1), and
significantly decreased soil volumetric moisture by 2.8% unit. The
interactive effects of warming and year on soil temperature and soil
inorganic N were not statistically significant (Table S2). However, the
warming effects on soil volumetric moisture differed significantly among
years, with warming-induced decreases in soil volumetric moisture of
4.8, 2.6, and 1.2% unit in 2011, 2012, and 2013, respectively (Table
S2).