Tropical tree species traits drive soil cation dynamics via effects on pH: a proposed conceptual framework

dc.contributor.author Raich, James
dc.contributor.author Hall, Steven
dc.contributor.author Russell, Ann
dc.contributor.author Hall, Steven
dc.contributor.author Raich, James
dc.contributor.author Russell, Ann
dc.contributor.department Ecology, Evolution and Organismal Biology
dc.contributor.department Natural Resource Ecology and Management
dc.date 2019-02-20T07:57:10.000
dc.date.accessioned 2020-06-30T02:18:09Z
dc.date.available 2020-06-30T02:18:09Z
dc.date.copyright Sun Jan 01 00:00:00 UTC 2017
dc.date.issued 2017-11-01
dc.description.abstract <p>Humid tropical forests are major players in the global carbon cycle, despite evidence that cations (rock‐derived, positively charged ions) can limit or co‐limit net primary productivity (NPP). In mature forests, tight cation cycling, i.e., without leaching losses, could maintain cation stocks on site. That mechanism does not explain how regenerating tropical secondary forest trees start from seeds and accrue large cation stocks in biomass, when growing on soils depleted in available cations. We propose a new mechanism that links tree species’ traits to soil cation availability via impacts on soil pH, a master biogeochemical driver. We tested plot‐level effects of tree species on soil pH, soil extractable cations, and cation accrual in biomass in a unique, 25‐yr‐old, randomized‐complete‐block experiment in which climate, soil, and previous land‐use history were similar across four native tree species grown in mono‐dominant plantations in Costa Rica. Surface‐soil pH in this Oxisol, initially 4.52 ± 0.02 (mean ± SE (standard error)), declined to 4.14 ± 0.02 under <em>Pentaclethra macroloba</em>, a nodulated legume, and increased to 4.71 ± 0.08 under <em>Vochysia guatemalensis</em>, an aluminum (Al) accumulator. The range in pH corresponds to a five‐fold difference in proton concentrations, which is sufficient to alter dispersion of organo‐mineral colloids. Cation stocks in biomass differed across species by 1.7‐, 1.9‐, 2.8‐, 2.9‐, 3.1‐, 3.5‐, and 17.2‐fold for iron (Fe), calcium (Ca), potassium (K), manganese (Mn), strontium (Sr), magnesium (Mg), and Al, respectively. Differential acquisition of available soil cations was an unlikely explanation for measured differences among species because changes in extractable soil cation stocks were unrelated to cation accrual in biomass. Soil pH and biomass cation stocks were highly correlated, however. By our proposed conceptual framework, species traits that strongly increase proton concentrations and decrease pH in soil, e.g., support of N fixation, increase colloid aggregation, reducing cation availability. Traits that reduce soil protons and increase pH, e.g., Al+3 accumulation, disperse colloids, thereby releasing cations occluded during pedogenesis. This highlights a novel biogeochemical role for the Al‐accumulation trait, i.e., liberation of occluded soil cations. Further studies would clarify effects of soil pH on cation supply via colloid dispersion, and its importance for nutrient acquisition in cation‐depleted soils.</p>
dc.description.comments <p>This article is published as Russell, Ann E., Steven J. Hall, and James W. Raich. "Tropical tree species traits drive soil cation dynamics via effects on pH: a proposed conceptual framework." <em>Ecological Monographs</em> 87, no. 4 (2017): 685-701. doi: <a href="https://doi.org/10.1002/ecm.1274">10.1002/ecm.1274</a>. Copyright by the Ecological Society of America. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/eeob_ag_pubs/329/
dc.identifier.articleid 1336
dc.identifier.contextkey 13767899
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath eeob_ag_pubs/329
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/23211
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/eeob_ag_pubs/329/2017_Hall_TropicalTree.pdf|||Fri Jan 14 23:37:04 UTC 2022
dc.source.uri 10.1002/ecm.1274
dc.subject.disciplines Biogeochemistry
dc.subject.disciplines Ecology and Evolutionary Biology
dc.subject.disciplines Natural Resources Management and Policy
dc.subject.disciplines Plant Sciences
dc.subject.disciplines Soil Science
dc.subject.keywords Al accumulation
dc.subject.keywords carbon cycling
dc.subject.keywords cation cycling
dc.subject.keywords fine roots
dc.subject.keywords soil pH
dc.subject.keywords stoichiometry
dc.subject.keywords tree species effects
dc.subject.keywords tropical forest regeneration
dc.title Tropical tree species traits drive soil cation dynamics via effects on pH: a proposed conceptual framework
dc.type article
dc.type.genre article
dspace.entity.type Publication
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