Mycorrhizal fungi constitute a considerable sink for plant photo-assimilates, yet poor knowledge about mycorrhizal mycelial respiration (R_Myc) hinders the quantification of its role in belowground carbon cycling. We synthesized available field data of R_Myc, and found that R_Myc contributed 15% of soil respiration and 38% of autotrophic respiration (including R_Myc and root respiration, R_Root). We observed no significant differences of R_Myc between ectomycorrhiza and arbuscular mycorrhiza dominated ecosystems. Both R_Myc/R_Root and R_Myc/(R_Root + R_Myc) significantly decreased with increasing R_Root, and correlated with absolute latitude, mean annual temperature and precipitation. Collectively, R_Myc is a substantial component of soil respiration and exhibits divergent geographical pattern with that of R_Root, and should be considered separately in terrestrial carbon cycling models.

菌根真菌构成了植物光同化物的一个相当大的汇，但对菌根菌丝呼吸 (R _Myc ) 的了解不足阻碍了对其在地下碳循环中作用的量化。我们综合了 R _{Myc 的}可用田间数据，发现 R _Myc贡献了 15% 的土壤呼吸和 38% 的自养呼吸（包括 R _Myc和根呼吸，R _Root）。我们观察到外生菌根和丛枝菌根主导的生态系统之间R _Myc没有显着差异。R _Myc /R _Root和 R _Myc /(R _Root  + R _Myc) 随着 R _{Root 的}增加而显着降低，并与绝对纬度、年平均温度和降水量相关。总的来说，R _Myc是土壤呼吸的重要组成部分，与 R _Root表现出不同的地理模式，应在陆地碳循环模型中单独考虑。