Results 101 to 110 of about 3,983 (257)

Vanadium Isotope Composition of Rock Reference Materials by MC-ICP-MS

Yankuang ceshi
In order to ensure the accuracy and precision of data during the analysis of vanadium isotopes, and facilitate the comparison of data among laboratories internationally, considering the shortage of inventory for the commonly used reference materials from
Liyi XU, Huimin YU, Xin DING, Fang HUANG
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

Assessment of Soil Erosion Over Six Decades in a Long‐Term Experiment Using Fallout 137Cs and RUSLE: A South American Case Study

Land Degradation &Development, EarlyView.
ABSTRACT Soil erosion remains a major global concern affecting agricultural productivity and land sustainability. This study investigates the magnitude and variability of soil erosion in a long‐term experiment (LTE) established in 1963 in Colonia, Uruguay, aiming to compare the performance of the 137Cs tracer technique and the RUSLE model across ...
Marcos Tassano, Mirel Cabrera, Joan Gonzalez, Mario Perez‐Bidegain, Olivier Evrard, Kathrin Grahmann, J. Andrés Quincke   +6 more
wiley   +1 more source

Impact of Sugarcane Management Practices and Time Periods on Soil Organic Carbon and δ13C Signature After Paddy Rice Conversion

Land Degradation &Development, EarlyView.
ABSTRACT Land use change (LUC) from paddy rice to sugarcane cultivation strongly influences soil organic carbon (SOC) stocks, with the extent and direction of change depending on residue management and time since conversion. This study aimed to (i) evaluate SOC stock changes under different residue management practices and conversion periods following ...
Nipon Mawan, Nuttapon Khongdee, Chunling Luo, Wanwisa Pansak   +3 more
wiley   +1 more source

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

Microbially driven organic carbon cycling at the land−sea interface: Advances and an integrated study framework

mLife, EarlyView.
Abstract The land−sea interface is a vital component of global biogeochemical cycles, where microorganisms drive the cycling of carbon, nitrogen, and sulfur. This review synthesizes the research progress from representative land−sea interfaces to elucidate how the microbial community structure and metabolic function influence the mobilization ...
Quanrui Chen, Kai Tang, Zhili He, Meng Li, Jun Yang, Weidong Zhai, Qiang Zheng, Nianzhi Jiao   +7 more
wiley   +1 more source

Quantification of sources and input-output pathways of heavy metals in soils from an abandoned mining watershed using Cd isotope tracing and inventory analysis

Geoderma
Quantitative analysis of regional-scale soil heavy metal (HM) sources presents significant challenges. The reliability of the widely used source apportionment model (positive matrix factorization, PMF) remains to be validated.
Qiumei Wu, Wenyou Hu, Kang Tian, Ya’nan Fan, Khalid Saifullah Khan, Hans Christian Bruun Hansen, Biao Huang   +6 more
doaj   +1 more source

Enabling Quantitative Benchtop 13C NMR Spectroscopy in Fast Continuous Flow

Magnetic Resonance in Chemistry, EarlyView.
Paramagnetic relaxation enhancement (PRE) accelerates polarization buildup in continuous‐flow benchtop 13$$ {}^{13} $$C NMR spectroscopy by the use of an immobilized PRE agent. By combining PRE with PENDANT polarization transfer, weak 13$$ {}^{13} $$C signals are enhanced even at high flow rates, enabling robust quantitative analysis of solvent ...
Sarah Mross, Hans Hasse, Kerstin Münnemann   +2 more
wiley   +1 more source

Urban‐driven homogenization of aquatic subsidy size structure cascades to riparian predator communities

Oikos, EarlyView.
The export of emergent aquatic insects is a critical energy subsidy for terrestrial food webs. While urbanization is known to alter stream communities, its effects on the size structure of these insect subsidies and the subsequent consequences for riparian predators remain poorly understood.
Charles Gagnon, Louis‐Philippe Beauchamp, Eric Harvey   +2 more
wiley   +1 more source

ELECTROMAGNETICALLY ENRICHED ISOTOPES, INVENTORY, APRIL 30, 1952 [PDF]

, 1952
Keim, C. P., Normand, C. E., Weaver, B.
openaire   +2 more sources