Papers by Oliver Chadwick
Global Biogeochemical Cycles, Sep 1, 2004
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Nature, Nov 21, 2016
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Restoration Ecology, May 31, 2016
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Geochimica et Cosmochimica Acta
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AGU Fall Meeting Abstracts, Dec 1, 2018
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Geological Society of America Abstracts with Programs, 2021
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Goldschmidt Abstracts, 2020
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Goldschmidt Abstracts, 2020
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Biogeochemistry, Nov 1, 2021
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Biogeochemistry, 2016
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AGUFM, Dec 1, 2017
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Goldschmidt Abstracts, 2020
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Biogeochemistry, Jan 8, 2021
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Ecosystems, Apr 1, 2019
Pedogenic thresholds describe where soil properties or processes change in an abrupt/nonlinear fa... more Pedogenic thresholds describe where soil properties or processes change in an abrupt/nonlinear fashion in response to small changes in environmental forcing. Contrastingly, soil process domains refer to the space between thresholds where soil properties are either unchanged, or change gradually, across a broad range of environmental forcing. Here, we test quantitatively for the presence of thresholds in patterns of soil properties across a climatic gradient on soils developed from ~20 ky old basaltic substrate on the Island of Hawai’i. From multiple soil properties, we quantitatively identified a threshold at ~750 mm/y of water balance (precipitation minus potential evapotranspiration), delineating the upper water balance boundary of soil fertility in these soils. From the threshold in the ratio of exchangeable Ca to total Ca we identified the lower water balance boundary of soil fertility in these soils at −1000 mm/y, however this threshold was qualitatively described as it lies near the limit of the climate gradient data where the statistical approach can not be applied. These two results represent the first time that pedogenic thresholds have been identified using statistically rigorous methods and the limitations of said methods, respectively. Comparing the 20 ky soils to soils that developed on basaltic substrates of 1.2 ky, 7.5 ky, 150 ky, and 4100 ky in a time-climate matrix, we found that our quantitative analysis supports previous qualitatively identified thresholds in the soils developed from older substrates. We also identified the 20 ky as the transition from kinetic to supply limitation for plant nutrients in soil in this system.
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Geoderma, Aug 1, 2023
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Biogeochemistry, Oct 1, 2016
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Geomorphology, Sep 1, 1990
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Biogeochemistry
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1 U.S. Geological Survey, Pacific Island Ecosystems Research Center, Inouye Regional Center, 1845... more 1 U.S. Geological Survey, Pacific Island Ecosystems Research Center, Inouye Regional Center, 1845 Wasp Blvd., B176, Honolulu, HI 96818 2 Hawai‘i Cooperative Studies Unit, University of Hawai‘i at Hilo, P.O. Box 44, Hawai‘i National Park, HI 96718 3 U.S. Geological Survey, Water Resources Mission Area, 345 Middlefield Rd., Menlo Park, CA 94025 4 University of California, Santa Barbara, 4312 Bren Hall, Santa Barbara, CA 93106 5 U.S. Geological Survey, Pacific Island Ecosystems Research Center, Kīlauea Field Station, P.O. Box 44, Hawai‘i National Park, HI 96718 6 Pacific Cooperative Studies Unit, Mauna Kahālāwai Watershed Partnership, Lahaina, HI 96761 7 Pacific Cooperative Studies Unit, Hawai‘i Volcanoes National Park, Natural Resources Division, Hawai‘i National Park, HI 96718 8 U.S. Geological Survey, Pacific Islands Water Science Center, 1845 Wasp Blvd., B176, Honolulu, HI 96818
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Papers by Oliver Chadwick