Search results for "ORGANIC-MATTER"

showing 3 items of 13 documents

Combined proton NMR wideline and NMR relaxometry to study SOM-water interactions of cation-treated soils

2013

Abstract Focusing on the idea that multivalent cations affect SOM matrix and surface, we treated peat and soil samples by solutions of NaCl, CaCl2 or AlCl3. Water binding was characterized with low field 1H-NMR-relaxometry (20 MHz) and 1H wideline NMR spectroscopy (400 MHz) and compared to contact angles. From 1H wideline, we distinguished mobile water and water involved in water molecule bridges (WaMB). Large part of cation bridges (CaB) between SOM functional groups are associated with WaMB. Unexpectedly, 1H NMRrelaxometry relaxation rates suggest that cross-linking in the Al-containing peat is not stronger than that by Ca. The relation between percentage of mobile water and WaMB water in…

Dewey Decimal Classification::500 | Naturwissenschaften::550 | GeowissenschaftenDewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften BiologieDewey Decimal Classification::600 | Technik::630 | Landwirtschaft VeterinärmedizinAnalytical chemistrySoil organic matter (SOM); Low field 1H NMR relaxometry; 1H wideline NMR spectroscopy; Contact angle; Cation bridges; Water molecule bridges.TA Engineering (General). Civil engineering (General)soil organic matter (som)Low field H-1 NMR relaxometrystateContact angleNuclear magnetic resonancewater molecule bridgesddc:550ddc:630natural organic-mattercontact angleWater Science and TechnologyFluid Flow and Transfer Processeschemistry.chemical_classificationhumic substancesWater molecule bridges.Nuclear magnetic resonance spectroscopycation bridgesCation bridgemultiexponential decay datanuclear-magnetic-resonanceH-1 wideline NMR spectroscopyProton NMRWater bindingTC1-978Relaxometryuniform-penalty inversionlow field 1h nmr relaxometrySettore AGR/13 - Chimica AgrariaContext (language use)1h wideline nmr spectroscopyforest soilsCation bridgesddc:570sandy soilOrganic mattercontact-angleContact angleSoil organic matter (SOM)repellencyMechanical EngineeringHydraulic engineeringchemistrySoil waterWater molecule bridgesJournal of Hydrology and Hydromechanics
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Long-Term Consequences of Water Pumping on the Ecosystem Functioning of Lake Sekšu, Latvia

2020

Cultural eutrophication, the process by which pollution due to human activity speeds up natural eutrophication, is a widespread and consequential issue. Here, we present the 85-year history of a small, initially Lobelia&ndash

INDICATORS0106 biological scienceslcsh:Hydraulic engineeringwater level fluctuationGeography Planning and DevelopmentDIAGENESISNorthern EuropeLEVEL FLUCTUATIONS01 natural sciencesBiochemistrylcsh:Water supply for domestic and industrial purposes:Geofag: 450 [VDP]CULTURAL EUTROPHICATION:Geosciences: 450 [VDP]Water Science and Technologybiologymulti-proxy approachPlanktonCladoceraSTATE6. Clean waterORGANIC-MATTEReutrophicationOceanographyCladocera1181 Ecology evolutionary biologyHypolimnionSEDIMENTS010506 paleontologyINDEXESAquatic ScienceChironomidaeHYPOLIMNETIC OXYGENdiatomslcsh:TC1-978Ecosystem14. Life underwater1172 Environmental sciences0105 earth and related environmental scienceslcsh:TD201-500010604 marine biology & hydrobiologyfungiSediment15. Life on landbiology.organism_classificationWater levelDiatom13. Climate actionEnvironmental scienceEutrophicationSOUTHERN FINLANDWater
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Differential Responses of Nitrate Reducer Community Size, Structure, and Activity to Tillage Systems

2009

ABSTRACT The main objective of this study was to determine how the size, structure, and activity of the nitrate reducer community were affected by adoption of a conservative tillage system as an alternative to conventional tillage. The experimental field, established in Madagascar in 1991, consists of plots subjected to conventional tillage or direct-seeding mulch-based cropping systems (DM), both amended with three different fertilization regimes. Comparisons of size, structure, and activity of the nitrate reducer community in samples collected from the top layer in 2005 and 2006 revealed that all characteristics of this functional community were affected by the tillage system, with increa…

[SDE] Environmental SciencesNITROUS-OXIDE EMISSIONSApplied Microbiology and BiotechnologyMicrobial EcologyCARBON[ SDE ] Environmental Sciences03 medical and health scienceschemistry.chemical_compoundHuman fertilizationNitrateMadagascarMANAGEMENTAGRICULTURAL SOILSNitritesSoil Microbiology[SDV.EE]Life Sciences [q-bio]/Ecology environment2. Zero hunger0303 health sciencesNitratesConventional tillageLAND-USEEcologyReducer030306 microbiologyMICROBIAL BIOMASSCONVENTIONAL TILLAGEAgricultureBiodiversityDENITRIFICATION04 agricultural and veterinary sciencesTillageSoil conditionerORGANIC-MATTERDENITRIFYING BACTERIAchemistryAgronomy[SDE]Environmental Sciences040103 agronomy & agriculture0401 agriculture forestry and fisheriesEnvironmental scienceOxidation-ReductionMulchSoil microbiologyFood ScienceBiotechnology
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