Microbial Communities and Environmental Factors Interact to Regulate Soil Respiration Under Nitrogen Addition Conditions in Alpine Meadows in Northwest China.

ABSTRACT: Alpine meadow ecosystems are highly sensitive to global change, yet the response mechanisms of soil respiration (Rs) to nitrogen deposition remain unclear. This research employed a gradient nitrogen addition experiment (0, 5, 10, 15, 20 g·m^-2·a^-1) in an alpine meadow ecosystem in Northwest China to determine the major factors regulating soil respiration responses. High nitrogen inputs (N15 and N20) significantly elevated Rs by 31.96% and 29.21% relative to the control (p < 0.05). Nitrogen addition significantly increased soil ammonium nitrogen (NH₄⁺-N) content, as well as the activities of cellobiohydrolase (CBH) and peroxidase (POD). Microbial community structure shifted with nitrogen addition, showing increased relative abundance of Acti

SUBMITTER: Cao X 

PROVIDER: S-EPMC12472389 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature