The LAP activities of SOM3, SOM5, and SOM9 showed a trend of “decreasing-increasing-decreasing” with the increase of the number of FTC at the freeze-thaw temperatures of − 18 to 5 °C, and their activities reached the peak in the complete cycle at the 9th FTC.
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Soil nitrogen-hydrolyzing enzyme activities respond differently to the freeze-thaw temperature and number of cycles.
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