Altitudinal variation of soil extracellular enzyme activity in a subtropical evergreen broad-leaved forest.

At higher altitudes, there was an increasing trend in soil nutrients due to lower biological diversity that reducing nutrient competition, and those areas experienced less external disturbance, further enhancing soil microbial activities.

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But our result was inconsistent with two previous studies, one that reported a decreasing trend [ 31 ] with the other showing no significant changes along an altitude gradient [ 37 ].

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