Biogeochemical cycles in drylands are regulated by the interplay between biological activity during short pulses of water availability and abiotic reactions. The rewetting of dry soils represents abrupt step change in soil biophysical conditions, causing rehydration of microbes, induces changes in plant activity, and increases local nutrient availability. Emissions of trace gases (nitric and nitrous oxides, methane, and carbon dioxide; NO, N2O, CH4 , and CO2 ) from soils during wetting events are products and by-products of microbial activity. While during long dry conditions most likely produced by abiotic reactions Understanding the controls on trace gases emissions are needed since those gases play an important role in atmospheric chemistry and are pathway of nutrient losses from dryland ecosystems.
During our session we are interested in expanding our knowledge on the
trace gases emissions from drylands.