Hagar Siebner

Lifestyle modulates riverbed diazotrophy: from abundance and activity to diversity of free-living and biofilm-associated N2 fixers

This study quantifies N2 fixation rates, diazotroph abundance, and diversity in the hyporheic zone, showing biofilm-associated diazotrophs are more active and abundant than free-living ones.

Dryland soil rewetting induces strong VOC emissions with potential to form ozone and aerosols

The paper studies VOC emissions from dryland soils after rewetting, finding strong emissions of sesquiterpenes and benzenoids that can form ozone and aerosols.

Heterotrophic diazotrophy along a river to lake continuum: lifestyle and contribution to N2 fixation

This study quantifies the contribution of heterotrophic diazotrophs to N2 fixation in a river-lake continuum, showing their dynamic lifestyles and significant role in nitrogen cycling.