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- Title
Exploring the Role of Cryptic Nitrogen Fixers in Terrestrial Ecosystems: A Frontier in Nitrogen Cycling Research.
- Authors
Cleveland, Cory C.; Reis, Carla R. G.; Perakis, Steven S.; Dynarski, Katherine A.; Batterman, Sarah A.; Crews, Timothy E.; Gei, Maga; Gundale, Michael J.; Menge, Duncan N. L.; Peoples, Mark B.; Reed, Sasha C.; Salmon, Verity G.; Soper, Fiona M.; Taylor, Benton N.; Turner, Monica G.; Wurzburger, Nina
- Abstract
Biological nitrogen fixation represents the largest natural flux of new nitrogen (N) into terrestrial ecosystems, providing a critical N source to support net primary productivity of both natural and agricultural systems. When they are common, symbiotic associations between plants and bacteria can add more than 100 kg N ha−1 y−1 to ecosystems. Yet, these associations are uncommon in many terrestrial ecosystems. In most cases, N inputs derive from more cryptic sources, including mutualistic and/or free-living microorganisms in soil, plant litter, decomposing roots and wood, lichens, insects, and mosses, among others. Unfortunately, large gaps remain in the understanding of cryptic N fixation. We conducted a literature review to explore rates, patterns, and controls of cryptic N fixation in both unmanaged and agricultural ecosystems. Our analysis indicates that, as is common with N fixation, rates are highly variable across most cryptic niches, with N inputs in any particular cryptic niche ranging from near zero to more than 20 kg ha−1 y−1. Such large variation underscores the need for more comprehensive measurements of N fixation by organisms not in symbiotic relationships with vascular plants in terrestrial ecosystems, as well as identifying the factors that govern cryptic N fixation rates. We highlight several challenges, opportunities, and priorities in this important research area, and we propose a conceptual model that posits an interacting hierarchy of biophysical and biogeochemical controls over N fixation that should generate valuable new hypotheses and research.
- Subjects
NITROGEN fixation; NITROGEN cycle; ECOSYSTEMS; PLANT litter; SOIL microbiology; BALLAST water
- Publication
Ecosystems, 2022, Vol 25, Issue 8, p1653
- ISSN
1432-9840
- Publication type
Article
- DOI
10.1007/s10021-022-00804-2