La nature has an amazing capacity for recovery, sometimes on its own and other times with a small external boost. An example of this was experienced at Mount St. Helens, where an unusual experiment with digging rodents had surprising results.
After the devastating 1980 eruption that claimed 57 lives and destroyed more than 500 square kilometers of forest, the ecosystem of Mount St. Helens was severely affected. The lack of fertile soil and the absence of an active microbial community made natural regeneration of vegetation difficult.
In 1983, a group of scientists decided to try an innovative solution. Their idea was to introduce “pocket gophers” or gophers in the affected area to churn the soil, exposing buried nutrients. This experiment was conducted in two plots for only 24 hours. Six years later, those same areas housed nearly 40,000 plants.
Rodents revive the soil
The work of the rodents not only had a physical impact on the land, but also favored the proliferation of essential mycorrhizal fungi for soil health. These fungi associate with plant roots, aiding in the absorption of nutrients and water, which is crucial in soil impoverished by volcanic ash.
A recent study, published in Frontiers in Microbiomes, investigated the communities of bacteria and fungi in areas of Mount St. Helens, revealing that plots with historical gopher activity had more carbon and a higher C/N ratio. This indicates that the intervention of these rodents helped improve the quality of the soil.
The study compared areas with different forest management practices. While in areas with tree cover the ecosystem recovered quickly thanks to the fall of pine needles, other areas logged before the eruption still show poor recovery, highlighting the importance of organic matter.
The lessons from this experiment are clear. Ecological recovery is not just about planting trees, but about understanding and fostering the complex microbial interactions within the soil. It is not about releasing animals indiscriminately, but about assessing the specific needs of each ecosystem.
Finally, this research also highlights the importance of microorganisms in capturing CO2 and improving the quality of the soil, underscoring their crucial role in the natural recovery processes.
