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Stronger fertilization effects on aboveground versus belowground plant properties across nine U.S. grasslands.
Keller, Adrienne B; Walter, Christopher A; Blumenthal, Dana M; Borer, Elizabeth T; Collins, Scott L; DeLancey, Lang C; Fay, Philip A; Hofmockel, Kirsten S; Knops, Johannes M H; Leakey, Andrew D B; Mayes, Melanie A; Seabloom, Eric W; Hobbie, Sarah E.
Afiliación
  • Keller AB; Department of Ecology, Evolution, and Behavior, University of Minnesota, Saint Paul, Minnesota, USA.
  • Walter CA; Department of Biology, West Virginia University, Morgantown, West Virginia, USA.
  • Blumenthal DM; USDA-ARS Rangeland Resources & Systems Research Unit, Fort Collins, Colorado, USA.
  • Borer ET; Department of Ecology, Evolution, and Behavior, University of Minnesota, Saint Paul, Minnesota, USA.
  • Collins SL; Department of Biology, University of New Mexico, Albuquerque, New Mexico, USA.
  • DeLancey LC; Department of Ecology, Evolution, and Behavior, University of Minnesota, Saint Paul, Minnesota, USA.
  • Fay PA; USDA-ARS Grassland, Soil, and Water Research Laboratory, Temple, Texas, USA.
  • Hofmockel KS; Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington, USA.
  • Knops JMH; Department of Agronomy, Iowa State University, Ames, Iowa, USA.
  • Leakey ADB; Health & Environmental Sciences Department, Xi'an Jiaotong-Liverpool University, Suzhou, Jiangsu, China.
  • Mayes MA; Department of Plant Biology, Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana-Champaign, Illinois, USA.
  • Seabloom EW; Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, Tennessee, USA.
  • Hobbie SE; Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA.
Ecology ; 104(2): e3891, 2023 02.
Article en En | MEDLINE | ID: mdl-36208208
Increased nutrient inputs due to anthropogenic activity are expected to increase primary productivity across terrestrial ecosystems, but changes in allocation aboveground versus belowground with nutrient addition have different implications for soil carbon (C) storage. Thus, given that roots are major contributors to soil C storage, understanding belowground net primary productivity (BNPP) and biomass responses to changes in nutrient availability is essential to predicting carbon-climate feedbacks in the context of interacting global environmental changes. To address this knowledge gap, we tested whether a decade of nitrogen (N) and phosphorus (P) fertilization consistently influenced aboveground and belowground biomass and productivity at nine grassland sites spanning a wide range of climatic and edaphic conditions in the continental United States. Fertilization effects were strong aboveground, with both N and P addition stimulating aboveground biomass at nearly all sites (by 30% and 36%, respectively, on average). P addition consistently increased root production (by 15% on average), whereas other belowground responses to fertilization were more variable, ranging from positive to negative across sites. Site-specific responses to P were not predicted by the measured covariates. Atmospheric N deposition mediated the effect of N fertilization on root biomass and turnover. Specifically, atmospheric N deposition was positively correlated with root turnover rates, and this relationship was amplified with N addition. Nitrogen addition increased root biomass at sites with low N deposition but decreased it at sites with high N deposition. Overall, these results suggest that the effects of nutrient supply on belowground plant properties are context dependent, particularly with regard to background N supply rates, demonstrating that site conditions must be considered when predicting how grassland ecosystems will respond to increased nutrient loading from anthropogenic activity.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Ecosistema / Pradera Tipo de estudio: Prognostic_studies País/Región como asunto: America do norte Idioma: En Revista: Ecology Año: 2023 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Ecosistema / Pradera Tipo de estudio: Prognostic_studies País/Región como asunto: America do norte Idioma: En Revista: Ecology Año: 2023 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos