Results 51 to 60 of about 107,478 (303)

Modeling carbon biogeochemistry in agricultural soils [PDF]

, 1994
An existing model of C and N dynamics in soils was supplemented with a plant growth submodel and cropping practice routines (fertilization, irrigation, tillage, crop rotation, and manure amendments) to study the biogeochemistry of soil carbon in arable ...
Frolking, Steve, Harriss, Robert, Li, Changsheng   +2 more
core   +2 more sources

The Effect of Temperature on Trophic Discrimination of Stable Isotopes (13C and 15N) and Biokinetics in Common Carp (Cyprinus carpio, L. 1758)

Journal of Experimental Zoology Part A: Ecological and Integrative Physiology, EarlyView.
ABSTRACT Stable isotope analysis (SIA) provides essential information toward a better understanding of trophic ecology. However, the interpretation of SIA results relies on assumptions about the trophic discrimination factor (TDF), which aims to improve the accuracy but may lead to bias.
I. Kuklina, J. Kubec, P. Balzani, T. B. Meador, M. J. Kainz, M. Buřič, L. Veselý   +6 more
wiley   +1 more source

Interaction Between Nitrogen Forms, Phosphorus Forms, and Mineral Phases Drives Phosphorus Limitation and Uptake by Ryegrass in a Model System

Journal of Plant Nutrition and Soil Science, EarlyView.
Nitrogen addition shifts plant nutrition from nitrogen to phosphorus (P) limitation. Nitrate‐based nitrogen enhances P acquisition more effectively than ammonium through increased phosphatase activity, independently of pH changes. Organic P forms induce stronger P limitation than inorganic P.
Issifou Amadou, Michel‐Pierre Faucon, Josep Peñuelas, Jordi Sardans, David Houben   +4 more
wiley   +1 more source

Rates of sustainable forest harvest depend on rotation length and weathering of soil minerals [PDF]

, 2014
Removals of forest biomass in the northeastern US may intensify over the coming decades due to increased demand for renewable energy. For forests to regenerate successfully following intensified harvests, the nutrients removed from the ecosystem in the ...
Blum, Joel D., Hamburg, Steven P, Vadeboncoeur, Matthew A, Yanai, Ruth D   +3 more
core   +2 more sources

Carbon, Nitrogen, and Corresponding Stable Isotope Signatures Reveal Channel Banks as Major Sediment Sources in a Tropical Agricultural Watershed

Land Degradation &Development, EarlyView.
ABSTRACT Uncertainties about the applicability of δ13C and δ15N as tracers of sediment sources in tropical river basins highlight the need for more in‐depth investigations of these isotopes. This study therefore assessed the effectiveness of δ13C and δ15N signatures in discriminating sediment sources in an agricultural catchment in Northeast Brazil ...
Fábio Farias Amorim, Yuri Jacques Agra Bezerra da Silva, Rennan Cabral Nascimento, Ygor Jacques Agra Bezerra da Silva, Angelo Jamil Maia, Tales Tiecher, Jean Paolo Gomes Minella, Yusheng Zhang, Hari Ram Upadhayay, Simon Pulley, Adrian L. Collins   +10 more
wiley   +1 more source

Carbon and Nitrogen in the Lower Basin of the Paraíba do Sul River, Southeastern Brazil: Element fluxes and biogeochemical processes

Revista Ambiente & Água, 2011
The study was conducted in the lower basin of the Paraíba do Sul River (PSR), in which 57,000 km2 of the basin is located in the Brazilian states of São Paulo, Minas Gerais and Rio de Janeiro. We proposed to identify the main sources of C and N fluxes in
Luiz Antonio Martinelli, Carlos Eduardo de Rezende, Alvaro Ramon Coelho Ovalle, Ricardo de Oliveira Figueiredo   +3 more
doaj   +1 more source

Distribution and microbial degradation of dissolved organic carbon in the northern South China Sea

Frontiers in Marine Science, 2022
Dissolved organic carbon (DOC) is the largest reduced carbon pool in the ocean, and it plays significant roles not only in the ocean carbon cycle but also in the control of many biogeochemical processes in the ocean.
Ling Ding, Ling Ding, Sen Shan, Chunle Luo, Xuchen Wang   +4 more
doaj   +1 more source

Mexico City and the biogeochemistry of global urbanization [PDF]

, 2000
Mexico City is far advanced in its urban evolution, and cities in currently developing nations may soon follow a similar course. This paper investigates the strengths and weaknesses of infrastructures for the emerging megacities.
Blake, DR, Bossert, JE, Chow, J, Colina, JA, Dubey, MK, Duce, RA, Edgerton, S, Elliott, S, Gaffney, J, Gupta, M, Guzman, F, Matson, PA, McNair, LA, Ortiz, E, Riley, W, Rowland, FS, Ruiz, ME, Russell, AG, Simpson, IJ, Smith, FA, Sosa, G, Streit, G, Watson, J   +22 more
core  

Urban Evolution: The Role of Water [PDF]

, 2015
The structure, function, and services of urban ecosystems evolve over time scales from seconds to centuries as Earth’s population grows, infrastructure ages, and sociopolitical values alter them.
Belt, Kenneth T., Kaushal, Sujay S., Mayer, Paul M., McDowell, William H., Newcomer Johnson, Tamara A., Pennino, Michael J., Wollheim, Wilfred M.   +6 more
core   +3 more sources

Impact of Nitrogen Deposition on Carbon and Nitrogen Cycling in Peatlands Under Land‐Use Change

Land Degradation &Development, EarlyView.
ABSTRACT Increasing nitrogen (N) deposition significantly alters carbon and N dynamics in peatlands by affecting microbial processes, enhancing greenhouse gas emissions and nutrient leaching into adjacent waters. However, how peatland conversion for agriculture and forestry influences the fate of added N under elevated atmospheric deposition remains ...
Yujing Deng, Kyle S. Boodoo, Klaus‐Holger Knorr, Stephan Glatzel   +3 more
wiley   +1 more source