Global biogeography of fungal and bacterial biomass carbon in topsoil
- San Diego State Univ., CA (United States)
- Univ. of California, Davis, CA (United States)
- Leiden Univ. (Netherlands). Inst. of Environmental Sciences, CML
- Lund Univ. (Sweden)
- Chinese Academy of Sciences (CAS), Changchun (China). Northeast Institute of Geography and Agroecology
- Univ. of Tartu, Tartu (Estonia). Institute of Ecology and Earth Sciences
- San Diego State Univ., CA (United States); Chinese Academy of Sciences (CAS), Shenyang (China). Shenyang Institute of Applied Ecology
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Bacteria and fungi, representing two major soil microorganism groups, play an important role in global nutrient biogeochemistry. Biogeographic patterns of bacterial and fungal biomass are of fundamental importance for mechanistically understanding nutrient cycling. We synthesized 1323 data points of phospholipid fatty acid-derived fungal biomass C (FBC), bacterial biomass C (BBC), and fungi:bacteria (F:B) ratio in topsoil, spanning 11 major biomes. The FBC, BBC, and F:B ratio display clear biogeographic patterns along latitude and environmental gradients including mean annual temperature, mean annual precipitation, net primary productivity, root C density, soil temperature, soil moisture, and edaphic factors. At the biome level, tundra has the highest FBC and BBC densities at 3684 (95% confidence interval: 1678–8084) mg kg-1 and 428 (237–774) mg kg-1, respectively; desert has the lowest FBC and BBC densities at 16.92 (14.4–19.89) mg kg-1 and 6.83 (6.1–7.65) mg kg-1, respectively. The F:B ratio varies dramatically, ranging from 1.8 (1.6–2.1) in savanna to 8.6 (6.7–11.0) in tundra. An empirical model was developed for the F:B ratio and it is combined with a global dataset of soil microbial biomass C to produce global maps for FBC and BBC in 0–30 cm topsoil. Across the globe, the highest FBC is found in boreal forest and tundra while the highest BBC is in boreal forest and tropical/subtropical forest, the lowest FBC and BBC are in shrub and desert. Global stocks of living microbial biomass C were estimated to be 12.6 (6.6–16.4) Pg C for FBC and 4.3 (0.5–10.3) Pg C for BBC in topsoil. These findings advance our understanding of the global distribution of fungal and bacterial biomass, which facilitates the incorporation of fungi and bacteria into Earth system models. The global maps of bacterial and fungal biomass serve as a benchmark for validating microbial models in simulating the global C cycle under a changing climate.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Biological and Environmental Research (BER); Chinese Academy of Sciences; National Natural Science Foundation of China (NSFC)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1786284
- Journal Information:
- Soil Biology and Biochemistry, Vol. 151; ISSN 0038-0717
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Global biogeography of fungal and bacterial biomass carbon in topsoil | dataset | January 2020 |
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