Global variation of soil microbial carbon-use efficiency in relation to growth temperature and substrate supply.

ABSTRACT: Soil microbial carbon-use efficiency (CUE), which is defined as the ratio of growth over C uptake, is commonly assumed as a constant or estimated by a temperature-dependent function in current microbial-explicit soil carbon (C) models. The temperature-dependent function (i.e., CUE = CUE₀ + m × (T - 20)) simulates the dynamic CUE based on the specific CUE at a given reference temperature (i.e., CUE₀) and a temperature response coefficient (i.e., m). Here, based on 780 observations from 98 sites, we showed a divergent spatial distribution of the soil microbial CUE (0.5 ± 0.25; mean ± SD) at the global scale. Then, the key parameters CUE₀ and m in the above equation were estimated as 0.475 and -0.016, respectively, based on the observations with the Markov cha

SUBMITTER: Qiao Y 

PROVIDER: S-EPMC6449510 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature