Ellen Wohl Kathleen Dwire Nicholas Sutfin Lina Polvi & Roberto Bazan. Mechanisms of carbon storage in mountainous headwater rivers. Nature Communications 2012 3 doi:10.1038-ncomms2274.

Abstract

Published research emphasizes rapid downstream export of terrestrial carbon from mountainous headwater rivers but little work focuses on mechanisms that create carbon storage along these rivers or on the volume of carbon storage. Here we estimate organic carbon stored in diverse valley types of headwater rivers in Rocky Mountain National Park CO USA. We show that low-gradient broad valley bottoms with old-growth forest or active beaver colonies store the great majority of above- and below-ground carbon. These laterally unconfined valley segments constitute <25% of total river length but store ~75% of the carbon. Floodplain sediment and coarse wood dominate carbon storage. Our estimates of riverine carbon storage represent a previously undocumented but important carbon sink. Our results indicate that: not all mountainous rivers rapidly export carbon; not all valley segments are equally important in carbon storage; and historical changes in riverine complexity have likely reduced carbon storage.

Shijulal Nelson-Sathi Tal Dagan Giddy Landan Arnold Janssen Mike Steel James O. McInerney Uwe Deppenmeier and William F. Martin. Acquisition of 1000 eubacterial genes physiologically transformed a methanogen at the origin of Haloarchaea. PNAS 2012 109(50): 20537–20542.

Abstract