Dr. Germino’s latest research, published in the Communications Earth & Environment journal in November 2024, reveals a startling and significant finding: invasive grasses are turning western U.S. rangelands from valuable carbon sinks into potential carbon sources. This research, a two-year collaboration between the US Geological Survey and Envu, provides the first comprehensive assessment of the impact of invasive annual grasses, like cheatgrass, on soil carbon stocks. The study found that the conversion of native perennial shrublands to these invasive grasslands can result in a 42-49% reduction in soil carbon, releasing a significant amount of carbon dioxide into the atmosphere. It also found that wildfire and grass invasion had a similar impact on soil carbon stocks, a surprising finding that challenges previous assumptions about the relative impacts of these disturbances. Dr. Germino is joined by another study author, Dr. Harry Quicke from Envu. They discuss implications of this new research for rangeland management and potential solutions. This is part 2 of the discussion. To hear the first part, go to episode 147. A full transcript of the episode and links to articles are at https://artofrange.com/episodes/aor-149-wildfire-depletes-ecosystem-carbon-storage-50-part-2-germino-maxwell-quicke. The Art of Range Podcast is supported by Vence, a subsidiary of Merck Animal Health; the Idaho Rangeland Resources Commission; and the Western Extension Risk Management Education Center.
