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Organic matter composition in the subsoil: Contribution of root litter and microbial-derived compounds

The aim of P2 within the Research Unit 'The Forgotten Part of Carbon Cycling: Organic Matter Storage and Turnover in Subsoils (SUBSOM)' is to contribute to the understanding of the different sources and stabilization processes of subsoil organic matter. This will be achieved by the analysis of the soil organic matter composition in topsoil versus subsoil by 13C NMR spectroscopy in bulk soils as well as organo-mineral associations. This will be done on a number of soil profiles differing in parent material and mineralogy and therefore also in the relevance of organo-mineral associations for subsoil C stabilization. In addition, a specific sampling approach will allow to differentiate three zones associated with the dominating effect of (1) leaching of DOC (the 'bulk soil' between trees), (2) root litter decomposition (the 'root-affected zone'), and (3) direct rhizodeposition of root exudates (the 'rhizosphere' sensu strictu). The contribution of above-ground versus below-ground litter is differentiated by the analysis of cutin and suberin biomarkers. Organic matter derived from microbial sources will be identified by the microbial signature of polysaccharides in the subsoil through the analysis of neutral sugars and amino sugars. Organo-mineral associations will be further characterized by N2-BET analyses to delineate the coverage of the mineral phase with organic matter. With these analyses and our specific analytical expertise at the submicron scale (nanoSIMS) we will participate in selected joint experiments of the research unit.

GTS Bulletin: ISND01 EDZW - Observational data (Binary coded) - BUFR (details are described in the abstract)

The ISND01 TTAAii Data Designators decode as: T1 (I): Observational data (Binary coded) - BUFR T1T2 (IS): Surface/sea level T1T2A1 (ISN): Synoptic observations from fixed land stations at non-standard time (i.e. 01, 02, 04, 05, ... UTC) A2 (D): 90°E - 0° northern hemisphere (The bulletin collects reports from stations: 10004;UFS TW Ems;10015;Helgoland;10020;List auf Sylt;10035;Schleswig;10055;Fehmarn;10147;Hamburg-Fuhlsbüttel;10162;Schwerin;10184;Greifswald;10200;Emden;10224;Bremen;10270;Neuruppin;10338;Hannover;10361;Magdeburg;10393;Lindenberg;10400;Düsseldorf;10469;Leipzig/Halle;10488;Dresden-Klotzsche;10506;Nürburg-Barweiler;10548;Meiningen;10637;Frankfurt/Main;10685;Hof;10738;Stuttgart-Echterdingen;10763;Nürnberg;10788;Straubing;10852;Augsburg;10946;Kempten;) (Remarks from Volume-C: SYNOP)

GTS Bulletin: ISND40 UMRR - Observational data (Binary coded) - BUFR (details are described in the abstract)

The ISND40 TTAAii Data Designators decode as: T1 (I): Observational data (Binary coded) - BUFR T1T2 (IS): Surface/sea level T1T2A1 (ISN): Synoptic observations from fixed land stations at non-standard time (i.e. 0100, 0200, 0400, 0500, ... UTC) A2 (D): 90°E - 0° northern hemisphere (Remarks from Volume-C: NilReason)

GTS Bulletin: SNLV41 UMRR - Surface data (details are described in the abstract)

The SNLV41 TTAAii Data Designators decode as: T1 (S): Surface data T1T2 (SN): Non-standard synoptic hour A1A2 (LV): Latvia (Remarks from Volume-C: NilReason)

GTS Bulletin: SRLV40 UMRR - Surface data (details are described in the abstract)

The SRLV40 TTAAii Data Designators decode as: T1 (S): Surface data T1T2 (SR): Hydrological (river) reports A1A2 (LV): Latvia (Remarks from Volume-C: NilReason)

GTS Bulletin: ISND76 AMDW - Observational data (Binary coded) - BUFR (details are described in the abstract)

The ISND76 TTAAii Data Designators decode as: T1 (I): Observational data (Binary coded) - BUFR T1T2 (IS): Surface/sea level T1T2A1 (ISN): Synoptic observations from fixed land stations at non-standard time (i.e. 01, 02, 04, 05, ... UTC) A2 (D): 90°E - 0° northern hemisphere (Remarks from Volume-C: NATIONAL AUTOMATIC SYNOP)

GTS Bulletin: ISND31 AMDS - Observational data (Binary coded) - BUFR (details are described in the abstract)

The ISND31 TTAAii Data Designators decode as: T1 (I): Observational data (Binary coded) - BUFR T1T2 (IS): Surface/sea level T1T2A1 (ISN): Synoptic observations from fixed land stations at non-standard time (i.e. 01, 02, 04, 05, ... UTC) A2 (D): 90°E - 0° northern hemisphere (Remarks from Volume-C: NATIONAL AUTOMATIC SYNOP)

GTS Bulletin: ISND32 AMDS - Observational data (Binary coded) - BUFR (details are described in the abstract)

The ISND32 TTAAii Data Designators decode as: T1 (I): Observational data (Binary coded) - BUFR T1T2 (IS): Surface/sea level T1T2A1 (ISN): Synoptic observations from fixed land stations at non-standard time (i.e. 01, 02, 04, 05, ... UTC) A2 (D): 90°E - 0° northern hemisphere (Remarks from Volume-C: NATIONAL AUTOMATIC SYNOP)

GTS Bulletin: ISND04 EDZW - Observational data (Binary coded) - BUFR (details are described in the abstract)

The ISND04 TTAAii Data Designators decode as: T1 (I): Observational data (Binary coded) - BUFR T1T2 (IS): Surface/sea level T1T2A1 (ISN): Synoptic observations from fixed land stations at non-standard time (i.e. 0100, 0200, 0400, 0500, ... UTC) A2 (D): 90°E - 0° northern hemisphere(The bulletin collects reports from stations: 10022;Leck;10028;Sankt Peter-Ording;10042;Schönhagen (Ostseebad);10093;Putbus;10097;Greifswalder Oie;10129;Bremerhaven;10130;Elpersbüttel;10139;Bremervörde;10142;Itzehoe;10146;Quickborn;10150;Dörnick;10152;Pelzerhaken;10156;Lübeck-Blankensee;) (Remarks from Volume-C: SYNOP)

GTS Bulletin: ISID10 EDZW - Observational data (Binary coded) - BUFR (details are described in the abstract)

The ISID10 TTAAii Data Designators decode as: T1 (I): Observational data (Binary coded) - BUFR T1T2 (IS): Surface/sea level T1T2A1 (ISI): Intermediate synoptic observations from fixed land stations A2 (D): 90°E - 0° northern hemisphere(The bulletin collects reports from stations: 10033;Glücksburg-Meierwik;10037;Schleswig-Jagel;10038;Hohn;10067;Marienleuchte;10126;Wittmundhafen;10136;Nordholz (Flugplatz);10172;Laage (Flugplatz);10238;Bergen;10246;Faßberg;10304;Meppen;10334;Wunstorf;10335;Bückeburg;10439;Fritzlar (Flugplatz);10476;Holzdorf (Flugplatz);10500;Geilenkirchen (Flugplatz);10502;Nörvenich (Flugplatz);10516;Koblenz (Falkensteinkaserne);10613;Büchel (Flugplatz);10618;Idar-Oberstein;10743;Niederstetten;10771;Kümmersbruck;10837;Laupheim;10853;Neuburg/Donau (Flugplatz);10856;Lechfeld;10857;Landsberg (Flugplatz);10860;Ingolstadt (Flugplatz);10954;Altenstadt;) (Remarks from Volume-C: SYNOP)

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