Nature and science
Moving the forest floor to test what it changed
Documented history and research · Sources compared
Transplanted lichens and mosses helped distinguish effects on soil from simple associations with it.
A patchwork beneath the trees
Ekaterina Sedia and Joan Ehrenfeld studied soils beneath lichens, mosses, grasses and bare patches in disturbed Pinelands landscapes. Their 2005 paper examined sites affected by severe wildfire or sand mining. The vegetation formed a visible mosaic, but the investigation concerned less visible differences in respiration and nitrogen processing below it. Sedia and Ehrenfeld (2005).
The cover was part of the mechanism
Soils beneath mosses and grasses accumulated more organic matter and produced more mineral nitrogen. Lichen-covered soils resembled bare patches more closely. Transplanting surface mats reproduced the contrasting patterns, strengthening the case that the cover itself could modify soil conditions rather than merely occupy soil already suited to it. Sedia and Ehrenfeld (2005).
A possible influence on what grows next
The authors connected these processes to succession after disturbance. Lichen-associated conditions included relatively greater nitrification, producing a mobile form of nitrogen, while moss and grass patches favored greater retention. They proposed that such differences might help explain why some patches remained resistant to change. That interpretation describes a possible pathway, not a fixed timetable for every burned or mined site. Sedia and Ehrenfeld (2005).
Sources and research limits
- Sedia and Ehrenfeld (2005) — Institutional record and full author abstract inspected; transplant result checked against indexed author text.
Raw soil measurements and the complete experimental tables were not reanalyzed.