Citation:

PANGAEA.988140 (dataset in review)

Name: Multiproxy assessment of soil organic matter from Catimbau National Park, northeastern Brazil using thermal, elemental, and phytolith-based analyses
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Caatinga; FTIR spectroscopy; phytoliths; podzalization

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Abstract:

A soil organic matter (SOM) was evaluated using a multiproxy approach integrating thermal, elemental, isotopic, and phytolith-based analyses. Differential scanning calorimetry and thermogravimetric analysis revealed distinct exothermic and endothermic reactions associated with the progressive decomposition of organic compounds, with the third exothermic event (3 % peak Exothermic) contributing a substantial proportion of total mass loss around 500 °C, indicating the presence of thermally stable organic fractions. Elemental composition and C/N ratios varied among profiles and horizons, reflecting differences in organic matter sources and degrees of decomposition. Stable carbon isotope ratios (δ¹³C) showed a wide range of values, suggesting mixed contributions of C₃- and C₄-derived organic inputs and possible vertical redistribution of organic carbon within the soil profiles. Phytolith assemblages were dominated by morphotypes indicative of terrestrial vegetation, with variable proportions of aquatic organism remains and charcoal, pointing to changes in vegetation structure, hydrological conditions, and fire activity over time. Multivariate analysis of phytolith indices highlighted clear compositional gradients among modern and fossil assemblages, supporting shifts in environmental conditions and organic matter dynamics. Overall, the combined thermal, elemental, isotopic, and phytolith evidence provides robust insights into the composition, stability, and environmental controls on soil organic matter in soils from Catimbau National Park, northeastern Brazil.

Keyword(s):

Caatinga; FTIR spectroscopy; phytoliths; podzalization

Coverage:

Median Latitude: -8.571023 * Median Longitude: -37.236187 * South-bound Latitude: -8.587000 * West-bound Longitude: -37.248272 * North-bound Latitude: -8.533758 * East-bound Longitude: -37.213330

Date/Time Start: 2021-03-16T00:00:00 * Date/Time End: 2021-10-14T00:00:00

Minimum DEPTH, soil: 0.025 m * Maximum DEPTH, soil: 1.630 m

Event(s):

C001_Profile_1 (Profile 1) * Latitude: -8.587000 * Longitude: -37.241000 * Date/Time: 2021-03-16T00:00:00 * Elevation: 800.0 m * Method/Device: Soil profile (SOIL) * Comment: Soil samples were collected according to the methodology proposed by Santos (2015), which involves describing and sampling soil profiles following standardized pedological procedures.

C001_Profile_2 (Profile 2) * Latitude: -8.586389 * Longitude: -37.241111 * Date/Time: 2021-03-16T00:00:00 * Elevation: 780.0 m * Method/Device: Soil profile (SOIL) * Comment: Soil samples were collected according to the methodology proposed by Santos (2015), which involves describing and sampling soil profiles following standardized pedological procedures.

C001_Profile_3 (Profile 3) * Latitude: -8.586010 * Longitude: -37.242130 * Date/Time: 2021-03-16T00:00:00 * Elevation: 760.0 m * Method/Device: Soil profile (SOIL) * Comment: Soil samples were collected according to the methodology proposed by Santos (2015), which involves describing and sampling soil profiles following standardized pedological procedures.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Clarindo, Analice Nunes
2	DEPTH, soil	Depth soil	m	Clarindo, Analice Nunes		Geocode
3	Depth, soil, minimum	Depth soil min	m	Clarindo, Analice Nunes
4	Depth, soil, maximum	Depth soil max	m	Clarindo, Analice Nunes
5	Sample code/label	Sample label		Clarindo, Analice Nunes
6	Pyrolysis temperature peak	Tpeak	°C	Clarindo, Analice Nunes	Differential scanning calorimetry	Endotermic
7	Pyrolysis temperature peak	Tpeak	°C	Clarindo, Analice Nunes	Differential scanning calorimetry	1 peak Exothermic
8	Pyrolysis temperature peak	Tpeak	°C	Clarindo, Analice Nunes	Differential scanning calorimetry	2 peak Exothermic 1
9	Pyrolysis temperature peak	Tpeak	°C	Clarindo, Analice Nunes	Differential scanning calorimetry	2 peak Exothermic 2
10	Pyrolysis temperature peak	Tpeak	°C	Clarindo, Analice Nunes	Differential scanning calorimetry	3 peak Exothermic
11	Peak heat-flow signal	Peak heat-flow	µV/min	Clarindo, Analice Nunes	Differential scanning calorimetry	Energy, 1 peak Exothermic
12	Peak heat-flow signal	Peak heat-flow	µV/min	Clarindo, Analice Nunes	Differential scanning calorimetry	Energy, 2 peak Exothermic 1
13	Peak heat-flow signal	Peak heat-flow	µV/min	Clarindo, Analice Nunes	Differential scanning calorimetry	Energy, 2 peak Exothermic 2
14	Peak heat-flow signal	Peak heat-flow	µV/min	Clarindo, Analice Nunes	Differential scanning calorimetry	Energy, 3 peak Exothermic
15	Mass loss	Mass loss	%	Clarindo, Analice Nunes	Differential scanning calorimetry	1 peak Exothermic + 2 peak Exothermic
16	Mass loss	Mass loss	%	Clarindo, Analice Nunes	Differential scanning calorimetry	3 peak Exothermic
17	Mass loss	Mass loss	%	Clarindo, Analice Nunes	Differential scanning calorimetry	Total
18	Mass loss	Mass loss	%	Clarindo, Analice Nunes	Differential scanning calorimetry	3 peak Exothermic ???
19	Phytoliths	Phytoliths	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Blocky
20	Phytoliths	Phytoliths	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Bulliform flabellate
21	Phytoliths	Phytoliths	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Elongate
22	Phytoliths	Phytoliths	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Acute
23	Phytoliths	Phytoliths	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Bilobate
24	Phytoliths	Phytoliths	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Cross
25	Phytoliths	Phytoliths	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Polyhedral
26	Phytoliths	Phytoliths	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Saddle
27	Phytoliths	Phytoliths	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Rondel
28	Phytoliths	Phytoliths	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Trapezoid
29	Phytoliths	Phytoliths	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Spheroid ornate
30	Phytoliths	Phytoliths	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Spheroid psilate
31	Phytoliths	Phytoliths	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Puzzle
32	Phytoliths	Phytoliths	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Tracheary
33	Phytoliths	Phytoliths	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Spheroid echinate
34	Phytoliths	Phytoliths	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Papillate
35	Phytoliths	Phytoliths	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Volcaniform
36	Phytoliths	Phytoliths	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Cone shape
37	Phytoliths	Phytoliths	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Chusquea type
38	Phytoliths	Phytoliths	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Classified
39	Indeterminata	Indet	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Unclassified
40	Sponge spicules	Sponge spicules	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Aquatic organism fossils
41	Diatoms	Diatoms	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Aquatic organism fossils
42	Cysts	Cysts	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Aquatic organism fossils
43	Charcoal	Charcoal	%	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips
44	Carbon, organic, total	TOC	%	Clarindo, Analice Nunes	Element analyser isotope ratio mass spectrometer (EA-IRMS)
45	δ13C, total organic carbon	δ13C TOC	‰ PDB	Clarindo, Analice Nunes	Element analyser isotope ratio mass spectrometer (EA-IRMS)
46	Nitrogen, total	TN	%	Clarindo, Analice Nunes	Element analyser isotope ratio mass spectrometer (EA-IRMS)
47	δ15N	δ15N	‰ air	Clarindo, Analice Nunes	Element analyser isotope ratio mass spectrometer (EA-IRMS)
48	Carbon/Nitrogen ratio	C/N		Clarindo, Analice Nunes	Calculated
49	Tree cover density index	D/P		Clarindo, Analice Nunes	Phytolith indices calculated following established approaches (Alexandre et al., 1997; Diester-Haas et al., 1973; Bremond, 2003; Coe, 2009; Machado, 2022)
50	Aridity adaptation index	Iph	%	Clarindo, Analice Nunes	Phytolith indices calculated following established approaches (Alexandre et al., 1997; Diester-Haas et al., 1973; Bremond, 2003; Coe, 2009; Machado, 2022)
51	Vegetation-climate adaptation index	Ic	%	Clarindo, Analice Nunes	Phytolith indices calculated following established approaches (Alexandre et al., 1997; Diester-Haas et al., 1973; Bremond, 2003; Coe, 2009; Machado, 2022)
52	Water stress index	Bi	%	Clarindo, Analice Nunes	Phytolith indices calculated following established approaches (Alexandre et al., 1997; Diester-Haas et al., 1973; Bremond, 2003; Coe, 2009; Machado, 2022)
53	Moisture index	Iu	%	Clarindo, Analice Nunes	Phytolith indices calculated following established approaches (Alexandre et al., 1997; Diester-Haas et al., 1973; Bremond, 2003; Coe, 2009; Machado, 2022)
54	Palm cover density relative to grass	Pa/P		Clarindo, Analice Nunes	Phytolith indices calculated following established approaches (Alexandre et al., 1997; Diester-Haas et al., 1973; Bremond, 2003; Coe, 2009; Machado, 2022)
55	Principal component 1	PC1	Score	Clarindo, Analice Nunes	Principal component analyses (PCA)	obtained from standardized phytolith indices (D/P, Iph%, Ic%, Bi%, Iu%, Pa/P)
56	Principal component 2	PC2	Score	Clarindo, Analice Nunes	Principal component analyses (PCA)	obtained from standardized phytolith indices (D/P, Iph%, Ic%, Bi%, Iu%, Pa/P)
57	Phytoliths	Phytoliths	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Blocky
58	Phytoliths	Phytoliths	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Bulliform flabellate
59	Phytoliths	Phytoliths	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Elongate
60	Phytoliths	Phytoliths	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Acute
61	Phytoliths	Phytoliths	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Bilobate
62	Phytoliths	Phytoliths	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Cross
63	Phytoliths	Phytoliths	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Polyhedral
64	Phytoliths	Phytoliths	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Saddle
65	Phytoliths	Phytoliths	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Rondel
66	Phytoliths	Phytoliths	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Trapezoid
67	Phytoliths	Phytoliths	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Spheroid ornate
68	Phytoliths	Phytoliths	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Spheroid psilate
69	Phytoliths	Phytoliths	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Puzzle
70	Phytoliths	Phytoliths	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Tracheary
71	Phytoliths	Phytoliths	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Spheroid echinate
72	Phytoliths	Phytoliths	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Papillate
73	Phytoliths	Phytoliths	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Volcaniform
74	Phytoliths	Phytoliths	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Cone shape
75	Phytoliths	Phytoliths	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Chusquea type
76	Sponge spicules	Sponge spicules	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Aquatic organism fossils
77	Diatoms	Diatoms	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Aquatic organism fossils
78	Cysts	Cysts	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips	Aquatic organism fossils
79	Charcoal	Charcoal	#	Clarindo, Analice Nunes	Phytolith permanent slides prepared with 25 μL of sample mounted in Entellan resin under coverslips

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

2546 data points

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