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Effects of Long-Term Nitrogen Addition and Throughfall Reduction on Extracellular Enzyme Activity and Ecoenzymatic Stoichiometry in a Temperate Forest
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Effects of Long-Term Nitrogen Addition and Throughfall Reduction on Extracellular Enzyme Activity and Ecoenzymatic Stoichiometry in a Temperate Forest
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Effects of Long-Term Nitrogen Addition and Throughfall Reduction on Extracellular Enzyme Activity and Ecoenzymatic Stoichiometry in a Temperate Forest
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Journal Article
Effects of Long-Term Nitrogen Addition and Throughfall Reduction on Extracellular Enzyme Activity and Ecoenzymatic Stoichiometry in a Temperate Forest
2024
Overview
Soil extracellular enzymes can regulate the decomposition processes of soil organic carbon (SOC). Thus, understanding how extracellular enzyme activity (EEA) and ecoenzymatic stoichiometry respond to altered nitrogen (N) deposition and precipitation patterns may establish a link between changes in soil organic matter and microbial responses in the context of climate change. The long-term field simulation experiments including the control, N deposition (N50, 50 kg·ha
−1
·yr
−1
), throughfall reduction (TR, − 30%), and their interactions (TR + N50) were built in a temperate forest in 2009. N50 significantly increased all EEAs except leucine aminopeptidase (LAP) and acid phosphatase (ACP). In addition, TR significantly reduced other EEAs except for ACP and polyphenol oxidase (PPO). N50 mainly promotes EEAs by influenced pH, increased SOC, and microbial biomass carbon (MBC). TR inhibited EEAs mainly by reducing soil moisture content (SMC), SOC, and MBC. Furthermore, the positive effects of N50 on EEAs were offset by the negative effects of TR under the interactive of N deposition and penetration reduction. In the control, C acquisition enzyme (C-acq):N acquisition enzyme (N-acq):P acquisition enzyme (P-acq) ≈ 1:1:1, N50, and TR resulted in alterations in the ecoenzymatic stoichiometric equilibrium. Wherein, N50 reduced BG: NAG + LAP but increased BG:ACP and NAG + LAP:ACP. The effect of TR on the ecoenzymatic stoichiometric ratio showed completely opposite to N50. TR + N50 reduced all ecoenzymatic stoichiometric ratios. Our study suggests that pH, SMC, substrate quality, and microbial biomass may be the main drivers for changes in EEAs. Our results elucidate the response mechanism of extracellular enzyme activity to N deposition and precipitation reduction, providing insights into the dynamics of SOC pools in the context of global change. In addition, this study proves that N limitation rather than phosphorus limitation exists in northeast temperate forests, providing a theoretical basis for future forest management.
