Citation:

PANGAEA.935586

Name: Bulk organic matter composition, n-alkane distribution patterns, and compound-specific stable isotope compositions of modern surface sediments and plants of South Africa's largest freshwater wetland
Published: 2021-09-08
License: https://creativecommons.org/licenses/by/4.0/
Keywords: d13C; dD; n-alkanes; organic matter; plant waxes; Rock-Eval; South Africa; wetland

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Published: 2021-09-08 • DOI registered: 2021-11-16

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Abstract:

Surface sediments (n=41) reflecting modern times (uppermost 10 cm) were collected during a November/December 2018 field campaign along the course of the Mkhuze River and a transect into Lake St. Lucia (KwaZulu Natal Province, South Africa). In addition, plant species (n=10) were collected based on previous reports of dominant vegetation communities and local occurrences. All samples were extracted soon after with a mixture of dichloromethane and methanol (9:1), purified, and fractionated. The apolar fraction was finally analyzed for its n-alkane concentrations and corresponding compound-specific carbon and hydrogen isotope compositions. Sub-samples of the surface sediments were also analyzed for (i) organic matter content (total organic carbon) and composition (d13C, carbon-to-nitrogen ratio) after decalcification, and (ii) for thermal indices (Hydrogen Index, R-index, I-index) using Rock-Eval analyses. The study's objective was to evaluate the most extensive freshwater wetland system in South Africa regarding its current condition and functioning by identifying the origin and transport pathways of sedimentary organic matter.

Keyword(s):

d13C; dD; n-alkanes; organic matter; plant waxes; Rock-Eval; South Africa; wetland

Related to:

Gensel, Julia; Humphries, Marc; Zabel, Matthias; Sebag, David; Hahn, Annette; Schefuß, Enno (2022): Origin, transport, and retention of fluvial sedimentary organic matter in South Africa's largest freshwater wetland, Mkhuze Wetland System. Biogeosciences, 19(11), 2881-2902, https://doi.org/10.5194/bg-19-2881-2022

Project(s):

Tracing Human and Climate impacts in South Africa (TRACES)

Funding:

Federal Ministry of Education and Research (BMBF), grant/award no. 03F0798A : Tracing Human and Climate impacts in South Africa

Coverage:

Median Latitude: -27.803904 * Median Longitude: 32.454323 * South-bound Latitude: -27.945700 * West-bound Longitude: 32.017550 * North-bound Latitude: -27.583917 * East-bound Longitude: 32.561083

Minimum DEPTH, sediment/rock: 0.1 m * Maximum DEPTH, sediment/rock: 0.1 m

Event(s):

MK01-10 * Latitude: -27.598700 * Longitude: 32.302083 * Location: Mkuze River * Comment: TRACES fieldtrip to the Mkuze (MK) River catchment in November/December 2018

MK02-2 * Latitude: -27.654833 * Longitude: 32.403083 * Location: Mkuze River

MK02-3 * Latitude: -27.654833 * Longitude: 32.403083 * Location: Mkuze River

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Event label	Event		Gensel, Julia
2	Latitude of event	Latitude		Gensel, Julia
3	Longitude of event	Longitude		Gensel, Julia
4	DEPTH, sediment/rock	Depth sed	m	Gensel, Julia	Geocode
5	Sample type	Samp type		Gensel, Julia
6	Sample comment	Sample comment		Gensel, Julia
7	Species	Species		Gensel, Julia
8	n-Alkane C16	C16	ng/g	Gensel, Julia
9	n-Alkane C17	C17	ng/g	Gensel, Julia
10	n-Alkane C18	C18	ng/g	Gensel, Julia
11	n-Alkane C19	C19	ng/g	Gensel, Julia
12	n-Alkane C20	C20	ng/g	Gensel, Julia
13	n-Alkane C21	C21	ng/g	Gensel, Julia
14	n-Alkane C22	C22	ng/g	Gensel, Julia
15	n-Alkane C23	C23	ng/g	Gensel, Julia
16	n-Alkane C24	C24	ng/g	Gensel, Julia
17	n-Alkane C25	C25	ng/g	Gensel, Julia
18	n-Alkane C26	C26	ng/g	Gensel, Julia
19	n-Alkane C27	C27	ng/g	Gensel, Julia
20	n-Alkane C28	C28	ng/g	Gensel, Julia
21	n-Alkane C29	C29	ng/g	Gensel, Julia
22	n-Alkane C30	C30	ng/g	Gensel, Julia
23	n-Alkane C31	C31	ng/g	Gensel, Julia
24	n-Alkane C32	C32	ng/g	Gensel, Julia
25	n-Alkane C33	C33	ng/g	Gensel, Julia
26	n-Alkane C34	C34	ng/g	Gensel, Julia
27	n-Alkane C35	C35	ng/g	Gensel, Julia
28	n-Alkane C23, δ13C	C23 δ13C	‰ PDB	Gensel, Julia
29	n-Alkane C23, δ13C, standard deviation	C23 δ13C std dev	±	Gensel, Julia
30	n-Alkane C25, δ13C	C25 δ13C	‰ PDB	Gensel, Julia
31	n-Alkane C25, δ13C, standard deviation	C25 δ13C std dev	±	Gensel, Julia
32	n-Alkane C27, δ13C	C27 δ13C	‰ PDB	Gensel, Julia
33	n-Alkane C27, δ13C, standard deviation	C27 δ13C std dev	±	Gensel, Julia
34	n-Alkane C29, δ13C	C29 δ13C	‰ PDB	Gensel, Julia
35	n-Alkane C29, δ13C, standard deviation	C29 δ13C std dev	±	Gensel, Julia
36	n-Alkane C31, δ13C	C31 δ13C	‰ PDB	Gensel, Julia
37	n-Alkane C31, δ13C, standard deviation	C31 δ13C std dev	±	Gensel, Julia
38	n-Alkane C33, δ13C	C33 δ13C	‰ PDB	Gensel, Julia
39	n-Alkane C33, δ13C, standard deviation	C33 δ13C std dev	±	Gensel, Julia
40	n-Alkane C35, δ13C	C35 δ13C	‰ PDB	Gensel, Julia
41	n-Alkane C35, δ13C, standard deviation	C35 δ13C std dev	±	Gensel, Julia
42	n-Alkane C25, δD	C25 δD	‰ SMOW	Gensel, Julia
43	n-Alkane C25, δD, standard deviation	C25 δD std dev	±	Gensel, Julia
44	n-Alkane C27, δD	C27 δD	‰ SMOW	Gensel, Julia
45	n-Alkane C27, δD, standard deviation	C27 δD std dev	±	Gensel, Julia
46	n-Alkane C29, δD	C29 δD	‰ SMOW	Gensel, Julia
47	n-Alkane C29, δD, standard deviation	C29 δD std dev	±	Gensel, Julia
48	n-Alkane C31, δD	C31 δD	‰ SMOW	Gensel, Julia
49	n-Alkane C31, δD, standard deviation	C31 δD std dev	±	Gensel, Julia
50	n-Alkane C33, δD	C33 δD	‰ SMOW	Gensel, Julia
51	n-Alkane C33, δD, standard deviation	C33 δD std dev	±	Gensel, Julia
52	n-Alkane C35, δD	C35 δD	‰ SMOW	Gensel, Julia
53	n-Alkane C35, δD, standard deviation	C35 δD std dev	±	Gensel, Julia
54	Carbon, organic, total	TOC	%	Gensel, Julia
55	Nitrogen, total	TN	%	Gensel, Julia
56	δ13C, bulk carbonate	δ13C bulk carb	‰ PDB	Gensel, Julia
57	Carbon/Nitrogen ratio	C/N		Gensel, Julia
58	Hydrogen index	HI		Gensel, Julia
59	I-index	I-index		Gensel, Julia
60	R-Index	R-Index		Gensel, Julia

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

2231 data points

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