Bringing function to structure: Root–soil interactions shaping phosphatase activity throughout a soil profile in Puerto Rico

Cabugao, Kristine Grace; Yaffar, Daniela; Stenson, Nathan; Childs, Joanne; Phillips, Jana; Mayes, Melanie A.; Yang, Xiaojuan; Weston, David J.; Norby, Richard J.

doi:10.1002/ece3.7036

Title: Bringing function to structure: Root–soil interactions shaping phosphatase activity throughout a soil profile in Puerto Rico

Journal Article · Tue Jan 19 00:00:00 EST 2021 · Ecology and Evolution

DOI:https://doi.org/10.1002/ece3.7036· OSTI ID:1786444

^[1]; Yaffar, Daniela ^[2]; Stenson, Nathan ^[3]; Childs, Joanne ^[3]; Phillips, Jana ^[3]; Mayes, Melanie A. ^[3]; Yang, Xiaojuan ^[3]; Weston, David J. ^[4]; Norby, Richard J. ^[5]

Bredesen Center for Interdisciplinary Research and Graduate Education University of Tennessee Knoxville Knoxville TN USA, Environmental Sciences Division and Climate Change Science Institute Oak Ridge National Laboratory Oak Ridge TN USA
Environmental Sciences Division and Climate Change Science Institute Oak Ridge National Laboratory Oak Ridge TN USA, Ecology and Evolutionary Biology University of Tennessee Knoxville Knoxville TN USA
Environmental Sciences Division and Climate Change Science Institute Oak Ridge National Laboratory Oak Ridge TN USA
Environmental Sciences Division and Climate Change Science Institute Oak Ridge National Laboratory Oak Ridge TN USA, Biosciences Division Oak Ridge National Laboratory Oak Ridge TN USA
Bredesen Center for Interdisciplinary Research and Graduate Education University of Tennessee Knoxville Knoxville TN USA, Environmental Sciences Division and Climate Change Science Institute Oak Ridge National Laboratory Oak Ridge TN USA, Ecology and Evolutionary Biology University of Tennessee Knoxville Knoxville TN USA

Abstract Large areas of highly productive tropical forests occur on weathered soils with low concentrations of available phosphorus (P). In such forests, root and microbial production of acid phosphatase enzymes capable of mineralizing organic phosphorus is considered vital to increasing available P for plant uptake. We measured both root and soil phosphatase throughout depth and alongside a variety of root and soil factors to better understand the potential of roots and soil biota to increase P availability and to constrain estimates of the biochemical mineralization within ecosystem models. We measured soil phosphatase down to 1 m, root phosphatase to 30 cm, and collected data on fine‐root mass density, specific root length, soil P, bulk density, and soil texture using soil cores in four tropical forests within the Luquillo Experimental Forest in Puerto Rico. We found that soil phosphatase decreased with soil depth, but not root phosphatase. Furthermore, when both soil and root phosphatase were expressed per soil volume, soil phosphatase was 100‐fold higher that root phosphatase. Both root and soil factors influenced soil and root phosphatase. Soil phosphatase increased with fine‐root mass density and organic P, which together explained over 50% of the variation in soil phosphatase. Over 80% of the variation in root phosphatase per unit root mass was attributed to specific root length (positive correlation) and available (resin) P (negative correlation). Synthesis : Fine‐root traits and soil P data are necessary to understand and represent soil and root phosphatase activity throughout the soil column and across sites with different soil conditions and tree species. These findings can be used to parameterize or benchmark estimates of biochemical mineralization in ecosystem models that contain fine‐root biomass and soil P distributions throughout depth.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: DE‐AC05‐00OR22725; AC05-00OR22725

OSTI ID:: 1786444

Alternate ID(s):: OSTI ID: 1766425; OSTI ID: 1786446

Journal Information:: Ecology and Evolution, Journal Name: Ecology and Evolution Vol. 11 Journal Issue: 3; ISSN 2045-7758

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: United Kingdom

Language:: English

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59 BASIC BIOLOGICAL SCIENCES
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soil (belowground) interactions
soil phosphorous availability
tropical forest

Title: Bringing function to structure: Root–soil interactions shaping phosphatase activity throughout a soil profile in Puerto Rico

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