SperberChadwickCasciottiEtAl2017

Référence

von Sperber, C., Chadwick, O.A., Casciotti, K.L., Peay, K.G., Francis, C.A., Kim, A.E., Vitousek, P.M. (2017) Controls of nitrogen cycling evaluated along a well-characterized climate gradient. Ecology, 98(4):1117-1129. (Scopus )

Résumé

The supply of nitrogen (N) constrains primary productivity in many ecosystems, raising the question “what controls the availability and cycling of N”? As a step toward answering this question, we evaluated N cycling processes and aspects of their regulation on a climate gradient on Kohala Volcano, Hawaii, USA. The gradient extends from sites receiving <300 mm/yr of rain to those receiving >3,000 mm/yr, and the pedology and dynamics of rock-derived nutrients in soils on the gradient are well understood. In particular, there is a soil process domain at intermediate rainfall within which ongoing weathering and biological uplift have enriched total and available pools of rock-derived nutrients substantially; sites at higher rainfall than this domain are acid and infertile as a consequence of depletion of rock-derived nutrients, while sites at lower rainfall are unproductive and subject to wind erosion. We found elevated rates of potential net N mineralization in the domain where rock-derived nutrients are enriched. Higher-rainfall sites have low rates of potential net N mineralization and high rates of microbial N immobilization, despite relatively high rates of gross N mineralization. Lower-rainfall sites have moderately low potential net N mineralization, relatively low rates of gross N mineralization, and rates of microbial N immobilization sufficient to sequester almost all the mineral N produced. Bulk soil δ15N also varied along the gradient, from +4‰ at high rainfall sites to +14‰ at low rainfall sites, indicating differences in the sources and dynamics of soil N. Our analysis shows that there is a strong association between N cycling and soil process domains that are defined using soil characteristics independent of N along this gradient, and that short-term controls of N cycling can be understood in terms of the supply of and demand for N. © 2017 by the Ecological Society of America

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@ARTICLE { SperberChadwickCasciottiEtAl2017,
    AUTHOR = { von Sperber, C. and Chadwick, O.A. and Casciotti, K.L. and Peay, K.G. and Francis, C.A. and Kim, A.E. and Vitousek, P.M. },
    TITLE = { Controls of nitrogen cycling evaluated along a well-characterized climate gradient },
    JOURNAL = { Ecology },
    YEAR = { 2017 },
    VOLUME = { 98 },
    NUMBER = { 4 },
    PAGES = { 1117-1129 },
    NOTE = { cited By 7 },
    ABSTRACT = { The supply of nitrogen (N) constrains primary productivity in many ecosystems, raising the question “what controls the availability and cycling of N”? As a step toward answering this question, we evaluated N cycling processes and aspects of their regulation on a climate gradient on Kohala Volcano, Hawaii, USA. The gradient extends from sites receiving <300 mm/yr of rain to those receiving >3,000 mm/yr, and the pedology and dynamics of rock-derived nutrients in soils on the gradient are well understood. In particular, there is a soil process domain at intermediate rainfall within which ongoing weathering and biological uplift have enriched total and available pools of rock-derived nutrients substantially; sites at higher rainfall than this domain are acid and infertile as a consequence of depletion of rock-derived nutrients, while sites at lower rainfall are unproductive and subject to wind erosion. We found elevated rates of potential net N mineralization in the domain where rock-derived nutrients are enriched. Higher-rainfall sites have low rates of potential net N mineralization and high rates of microbial N immobilization, despite relatively high rates of gross N mineralization. Lower-rainfall sites have moderately low potential net N mineralization, relatively low rates of gross N mineralization, and rates of microbial N immobilization sufficient to sequester almost all the mineral N produced. Bulk soil δ15N also varied along the gradient, from +4‰ at high rainfall sites to +14‰ at low rainfall sites, indicating differences in the sources and dynamics of soil N. Our analysis shows that there is a strong association between N cycling and soil process domains that are defined using soil characteristics independent of N along this gradient, and that short-term controls of N cycling can be understood in terms of the supply of and demand for N. © 2017 by the Ecological Society of America },
    AFFILIATION = { Department of Biology, Stanford University, Stanford, CA 94305, United States; Department of Geography, University of California, Santa Barbara, CA 93106, United States; Department of Earth System Science, Stanford University, Stanford, CA 94305, United States; Earth Systems Program, Stanford University, Stanford, CA 94305, United States; Institute of Crop Science and Resource Conservation, Soil Science and Soil Ecology Group, Nussallee 13, Bonn, 53115, Germany },
    AUTHOR_KEYWORDS = { climate gradient; Hawaii; isotope dilution; nitrogen availability; nitrogen cycling; nitrogen mineralization; soil fertility; δ15N },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1002/ecy.1751 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-85017232929&doi=10.1002%2fecy.1751&partnerID=40&md5=39da435ffc6024fdfea1d70c164d15c6 },
}

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