Arbuscular mycorrhizal fungi regulate soil respiration and its response to precipitation change in a semiarid steppe.

During the three growing seasons, water addition treatment decreased soil temperature by 2.7% with marginal significance ( P = 0.07; Table 1 and Fig. 3g–i ) and significantly enhanced soil moisture by 21% ( P < 0.01; Table 1 and Fig. 3j–l ).

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