Mycorrhizal respiration （R_Myc） significantly affects the carbon cycling in terrestrial ecosystems， yet its contribution potential and main influencing factors remain unclear. In this study， a meta-analysis was conducted by using 105 datasets from 41 publications. By employing a mesh exclusion method to distinguish soil respiration components， we quantified the average contribution of R_Myc to soil autotrophic respiration （R_Auto） and total soil respiration （R_T）， and compared the differences between arbuscular mycorrhizal （AM） and ectomycorrhizal （ECM） contributions. The results showed that the average contribution rates of R_Myc to R_Auto and R_T were 38.55% and 16.87%， respectively. Specifically， the average contributions of AM and ECM to R_T were 16.78% （ranging from 2.48% to 32.00%） and 16.73% （ranging from 3.00% to 54.47%）， respectively. Correlation analysis indicated that the R_Myc rate was significantly negatively correlated with absolute longitude， mean annual precipitation， soil total nitrogen， and soil total phosphorus， while it was significantly positively correlated with soil pH and fine root biomass. Over all， R_Myc is an important component of soil respiration， and is affected by environmental factors， soil nutrient supply， and symbiotic relationships. This study revealed the contribution of mycorrhizal respiration to soil carbon fluxes at a global scale， providing a scientific basis for improving soil carbon cycle models.

Soil Respiration  /  Mycorrhiza Respiration  /  Grid Exclusion Method  /  Soil Properties  /  Ecosystem