Title: Phosphorus limitation of early growth differs between nitrogen‐fixing and nonfixing dry tropical forest tree species

Journal Article · · New Phytologist
DOI: https://doi.org/10.1111/nph.18612 · OSTI ID:1902433
ORCiD logo [1];  [1];  [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]
  1. Department of Plant and Microbial Biology University of Minnesota St Paul MN 55108 USA
  2. Department of Plant and Microbial Biology University of Minnesota St Paul MN 55108 USA, School of Biological Sciences The University of Utah Salt Lake City UT 84112 USA
  3. Department of Biology and Bieler School of Environment McGill University Montréal QC H3A 1B1 Canada
  4. Department of Soil, Water, and Climate University of Minnesota St Paul MN 55108 USA
  5. Department of Plant and Microbial Biology University of Minnesota St Paul MN 55108 USA, Department of Ecology, Evolution, and Behavior University of Minnesota St Paul MN 55108 USA

Summary Tropical forests are often characterized by low soil phosphorus (P) availability, suggesting that P limits plant performance. However, how seedlings from different functional types respond to soil P availability is poorly known but important for understanding and modeling forest dynamics under changing environmental conditions. We grew four nitrogen (N)‐fixing Fabaceae and seven diverse non‐N‐fixing tropical dry forest tree species in a shade house under three P fertilization treatments and evaluated carbon (C) allocation responses, P demand, P‐use, investment in P acquisition traits, and correlations among P acquisition traits. Nitrogen fixers grew larger with increasing P addition in contrast to non‐N fixers, which showed fewer responses in C allocation and P use. Foliar P increased with P addition for both functional types, while P acquisition strategies did not vary among treatments but differed between functional types, with N fixers showing higher root phosphatase activity (RPA) than nonfixers. Growth responses suggest that N fixers are limited by P, but nonfixers may be limited by other resources. However, regardless of limitation, P acquisition traits such as mycorrhizal colonization and RPA were nonplastic across a steep P gradient. Differential limitation among plant functional types has implications for forest succession and earth system models.

Research Organization:
Univ. of Minnesota, Minneapolis, MN (United States); University of Notre Dame, IN (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC0014363; SC0020344
OSTI ID:
1902433
Journal Information:
New Phytologist, Journal Name: New Phytologist Journal Issue: 3 Vol. 237; ISSN 0028-646X
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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