Fig. 1
From: Responses of soil microbial communities to freeze–thaw cycles in a Chinese temperate forest
The variations of a air and soil temperature and b soil water content in the experimental site during the study period. Lowercase letters (a–h) and arrows along the timeline in figure a indicate the sampling time. Mar 12, Mar 25, and Apr 12 are three pivotal time for our study, which are called stage I, II, and III for short. The asterisks are used to label the date of the freeze–thaw cycles were detected in O horizon (red) and A horizon (blue) soil. Three snowfall events were recorded during the period indicated by the snowfall symbol. Lowercase letters in figure b indicate significant differences in soil water content among different sampling time for each soil layer (P < 0.05)