Including Stable Carbon Isotopes to Evaluate the Dynamics of Soil Carbon in the Land-Surface Model ORCHIDEE.

ABSTRACT: Soil organic carbon (SOC) is a crucial component of the terrestrial carbon cycle and its turnover time in models is a key source of uncertainty. Studies have highlighted the utility of δ¹³C measurements for benchmarking SOC turnover in global models. We used ¹³C as a tracer within a vertically discretized soil module of a land-surface model, Organising Carbon and Hydrology In Dynamic Ecosystems- Soil Organic Matter (ORCHIDEE-SOM). Our new module represents some of the processes that have been hypothesized to lead to a ¹³C enrichment with soil depth as follows: 1) the Suess effect and CO₂ fertilization, 2) the relative ¹³C enrichment of roots compared to leaves, and 3) ¹³C discrimination associated with microbial activity. We

SUBMITTER: Camino-Serrano M 

PROVIDER: S-EPMC6988498 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature