Soil conditions at the start and end of the freeze/thaw incubation experiments: Average total nitrogen (TN) (a), Soil organic matter (SOM) (b), NH₄⁺ (c), NH₄⁺ content at different soil depths for M1 (d), and NO₃⁻ (e), NO₃⁻ content at different soil depths for SUG (f).

Abstract

<p>The vertical bars indicate standard errors of three replicates.</p