资源环境科技发展态势分析平台

Despite the global significance of the subsurface biosphere, the degree to which it depends on surface organic carbon (OC) is still poorly understood. Here, we compare stable and radiogenic carbon isotope compositions of microbial phospholipid fatty acids (PLFAs) with those of in situ potential microbial C sources to assess the major C sources for subsurface microorganisms in biogeochemical distinct shallow aquifers (Critical Zone Exploratory, Thuringia Germany). Despite the presence of younger OC, the microbes assimilated C-14-free OC to varying degrees; similar to 31% in groundwater within the oxic zone, similar to 47% in an iron reduction zone, and similar to 70% in a sulfate reduction/anammox zone. The persistence of trace amounts of mature and partially biodegraded hydrocarbons suggested that autochthonous petroleum-derived hydrocarbons were a potential C-14-free C source for heterotrophs in the oxic zone. In this zone, Delta C-14 values of dissolved inorganic carbon (-366 +/- 18 parts per thousand) and 11MeC16:0 (-283 +/- 32 parts per thousand), an important component in autotrophic nitrite oxidizers, were similar enough to indicate that autotrophy is an important additional C fixation pathway. In anoxic zones, methane as an important C source was unlikely since the C-13-fractionations between the PLFAs and CH4 were inconsistent with kinetic isotope effects associated with methanotrophy. In the sulfate reduction/anammox zone, the strong C-14-depletion of 10MeC16:0 (-942 +/- 22 parts per thousand), a PLFA common in sulfate reducers, indicated that those bacteria were likely to play a critical part in C-14-free sedimentary OC cycling. Results indicated that the C-14-content of microbial biomass in shallow sedimentary aquifers results from complex interactions between abundance and bioavailability of naturally occurring OC, hydrogeology, and specific microbial metabolisms.