Increases in the flux of carbon belowground stimulate nitrogen uptake and sustain the long-term enhancement of forest productivity under elevated CO(2)
2011
Drake, John E. | Gallet-Budynek, Anne | Hofmockel, Kirsten S. | Bernhardt, Emily S. | Billings, Sharon A. | Jackson, Robert B. | Johnsen, Kurt S. | Lichter, John | Mccarthy, Heather R. | Mccormack, M. Luke | Moore, David J.P. | Oren, Ram | Palmroth, Sari | Phillips, Richard P. | Pippen, Jeffrey S. | Pritchard, Seth G. | Treseder, Kathleen K. | Schlesinger, William H. | Delucia, Evan H. | Finzi, Adrien C. | University of Illinois System | Department of Biology [Gainesville] (UF|Biology) ; University of Florida [Gainesville] (UF) | Transfert Sol-Plante et Cycle des Eléments Minéraux dans les Ecosystèmes Cultivés (TCEM) ; Institut National de la Recherche Agronomique (INRA)-École Nationale d'Ingénieurs des Travaux Agricoles - Bordeaux (ENITAB) | Department of Ecology, Evolution and Organismal Biology ; Iowa State University (ISU) | Department of Biology ; Duke University [Durham] | University of Kansas [Lawrence] (KU) | Nicholas School of the Environment ; Duke University [Durham] | US Forest Service | Bowdoin College | Department of Earth System Science [Irvine] (ESS) ; University of California [Irvine] (UC Irvine) ; University of California (UC)-University of California (UC) | Pennsylvania State University (Penn State) ; Penn State System | King‘s College London | Department of Biology ; Indiana University [Bloomington] ; Indiana University System-Indiana University System | College of Charleston | Department of Ecology and Evolutionary Biology ; University of California (UC) | Cary Institute of Ecosystem Studies | University of Illinois at Urbana-Champaign [Urbana] (UIUC) ; University of Illinois System
International audience
اظهر المزيد [+] اقل [-]إنجليزي. The earth’s future climate state is highly dependent upon changes in terrestrial C storage in response to rising concentrations of atmospheric CO2. Here we show that consistently enhanced rates of net primary production (NPP) are sustained by a C-cascade through the root-microbe-soil system; increases in the flux of C belowground under elevated CO2 stimulated microbial activity, accelerated the rate of soil organic matter decomposition and stimulated tree uptake of N bound to this SOM. This process set into motion a positive feedback maintaining greater C gain under elevated CO2 as a result of increases in canopy N content and higher photosynthetic N-use efficiency. The ecosystem-level consequence of the enhanced requirement for N and the exchange of plant C for N belowground is the dominance of C storage in tree biomass but the preclusion of a large C sink in the soil.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
تم تزويد هذا السجل من قبل Institut national de la recherche agronomique