Results 51 to 60 of about 106,242 (267)

Proximate controls on semiarid soil greenhouse gas fluxes across 3 million years of soil development [PDF]

, 2015
Soils are important sources and sinks of three greenhouse gases (GHGs): carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). However, it is unknown whether semiarid landscapes are important contributors to global fluxes of these gases, partly ...
Hart, SC, Hungate, BA, Nasto, MK, Sullivan, BW   +3 more
core   +1 more source

Effects of Polyvalent Cations on FTIR Spectra of Organic Matter–Cation Associations

Journal of Plant Nutrition and Soil Science, EarlyView.
ABSTRACT Background The composition of soil organic matter (SOM) can be characterized by functional groups in the organic matter (OM). The carboxylic acid and carboxylate groups of OM show specific absorption bands in Fourier‐transform infrared (FTIR) spectra. However, cation–OM interactions may affect absorption bands and limit spectral interpretation
Nisha Bhattarai, Ruth H. Ellerbrock, Horst H. Gerke   +2 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

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

Ecological homogenization of soil properties in the American residential macrosystem

Ecosphere, 2022
The conversion of native ecosystems to residential ecosystems dominated by lawns has been a prevailing land‐use change in the United States over the past 70 years.
Christopher D. Ryan, Peter M. Groffman, J. Morgan Grove, Sharon J. Hall, James B. Heffernan, Sarah E. Hobbie, Dexter H. Locke, Jennifer L. Morse, Christopher Neill, Kristen C. Nelson, Jarlath O'Neil‐Dunne, Rinku Roy Chowdhury, Meredith K. Steele, Tara L. E. Trammell   +13 more
doaj   +1 more source

Modeling soil organic carbon change in croplands of China [PDF]

, 2003
Using 1990 conditions, we modeled carbon (C) and nitrogen (N) biogeochemical cycles in croplands of China (and, for comparison, the United States) to estimate the annual soil organic-carbon (SOC) balance for all cropland.
Frolking, Steve, Galloway, J N, Harriss, Robert, Li, Changsheng, Moore, B, Schimel, Alexandre C., Wang, Xiaoke, Zhuang, Yahui   +7 more
core   +1 more source

The biogeochemistry of carbon across a gradient of streams and rivers within the Congo Basin [PDF]

, 2014
Dissolved organic carbon (DOC) and inorganic carbon (DIC and pCO2), lignin biomarkers and the optical properties of dissolved organic matter (DOM) were measured in a gradient of streams and rivers within the Congo Basin (Republic of Congo), with the aim ...
Aerts, Aiken, Aitkenhead, Alin, Aufdenkampe, Battin, Benner, Bouillon, Brunet, Bwangoy, Cole, Cory, Coynel, Davidson, Del Vecchio, Fellman, Goñi, Goñi, Hamilton, Hedges, Hedges, Hedges, Helms, Hernes, Hernes, Hernes, Hernes, Hernes, Hernes, Hernes, Hood, Johnson, Johnson, Koenig, Laporte, Laraque, Mann, Mayorga, Mayorga, McKnight, Mladenov, O'Donnell, Pellerin, Pellerin, Pinney, Richey, Richey, Richey, Sanderman, Spencer, Spencer, Spencer, Spencer, Spencer, Spencer, Spencer, Spencer, Striegl, Wang, Wang, Ward, Weishaar, Weiss, Wilson, Worrall, Yamashita, Yamashita   +66 more
core   +1 more source

The Differential Responses of Coastal Diatoms to Ocean Acidification and Warming: A Comparison Between Thalassiosira sp. and Nitzschia closterium f.minutissima

Frontiers in Microbiology, 2022
Marine diatoms are one of the marine phytoplankton functional groups, with high species diversity, playing important roles in the marine food web and carbon sequestration.
Ting Cai, Ting Cai, Yuanyuan Feng, Yuanyuan Feng, Yanan Wang, Tongtong Li, Jiancai Wang, Wei Li, Weihua Zhou, Weihua Zhou, Weihua Zhou   +10 more
doaj   +1 more source

Modeling nitrogen loadings from agricultural soils in southwest China with modified DNDC [PDF]

, 2011
Degradation of water quality has been widely observed in China, and loadings of nitrogen (N) and other nutrients from agricultural systems play a key role in the water contamination.
Deng, Jia, Li, Changsheng, Tang, Jialiang, Wang, Tao, Zheng, Xunhua, Zhou, Zaixing, Zhu, Bo   +6 more
core   +3 more sources