Acacia and Eucalyptus plantations modify the molecular composition of density organic matter fractions of subtropical native pasture soils
In Southern Brazil, exotic species as Acacia (A) and Eucalyptus (E) are often planted over native pasturelands and may change bulk soil organic matter (SOM) composition as verified in our previous study with Cambisols (0–5 cm). Here we aimed to follow the impact of seven-year A and E plantation on t...
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Elsevier
2024-01-01
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| Series: | Geoderma |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0016706123004226 |
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| author | Otávio dos Anjos Leal Graciele Sarante Santana Heike Knicker Francisco J. González-Vila José A. González-Pérez Deborah Pinheiro Dick |
| author_facet | Otávio dos Anjos Leal Graciele Sarante Santana Heike Knicker Francisco J. González-Vila José A. González-Pérez Deborah Pinheiro Dick |
| author_sort | Otávio dos Anjos Leal |
| collection | DOAJ |
| description | In Southern Brazil, exotic species as Acacia (A) and Eucalyptus (E) are often planted over native pasturelands and may change bulk soil organic matter (SOM) composition as verified in our previous study with Cambisols (0–5 cm). Here we aimed to follow the impact of seven-year A and E plantation on the composition of the free light- (FLF), occluded light- (OLF) and heavy fraction (HF) of SOM along the soil profile. We hypothesized that A and E may have shifted the molecular composition and carbon (C) stocks (Cs) of SOM fractions, at least at 0–5 cm; with stronger shifts caused by A due to greater E litter recalcitrance. Litter and soil samples (0–20 cm) were collected at A and E and neighboring native pasturelands without A (WA) and without E (WE). Litter, FLF, OLF and HF samples were subjected to C, nitrogen (N), pyrolysis–gas chromatography/mass spectrometry (Py-GC/MS) and lipid biomarkers analysis. In E soil, the Cs of FLF at 0–5 cm (0.5 Mg ha−1) and OLF at 5–10 cm (1.7 Mg ha−1) were 194 and 70 % greater than in WE, whereas in A soil the Cs of OLF at 0–5 cm (0.2 Mg ha−1) was 44 % lower than in WA. Nevertheless, A changed more remarkably the composition of SOM fractions, confirming our hypothesis partially, likely due to greater A litter biodegradability (<C:N ratio, <aromatic and polyaromatic and >polysaccharides abundance) compared to E. The contribution of A litter to FLF (0–10 cm) was evidenced by abundance of long chain and the predominance of odd-over-even n-alkanes (particularly >C29), and to OLF (0–20 cm) by the greatest abundance of n-alkanes at C31, resembling A litter. Loss of C and N of OLF in A compared to WA (0–5 cm) was compensated by fresh A litter additions to FLF and OLF and microbial-derived compounds association to soil minerals, equaling soil Cs in A and WA. The lower soil N stock in A compared to WA likely resulted from depletion of occluded microbial-derived N-compounds, supposedly reflecting the breakdown of soil aggregates at forest plantation. The increase of Cs in FLF and OLF of E compared to WE soil was associated with increased abundance of aromatics and n-alkane/alkenes and decrease of fatty acids. Similar patterns of n-alkanes observed for OLF of E and WE soil confirmed the incipient contribution of E litter to OLF. Conversion of these pastures to A and E modifies SOM composition and protection, requiring policies in view of the highly invasive potential and possible negative implications of A and E to native pasture regeneration. |
| first_indexed | 2024-03-08T20:11:59Z |
| format | Article |
| id | doaj.art-58492156d9a942028eb1be221c035f35 |
| institution | Directory Open Access Journal |
| issn | 1872-6259 |
| language | English |
| last_indexed | 2024-03-08T20:11:59Z |
| publishDate | 2024-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Geoderma |
| spelling | doaj.art-58492156d9a942028eb1be221c035f352023-12-23T05:19:48ZengElsevierGeoderma1872-62592024-01-01441116745Acacia and Eucalyptus plantations modify the molecular composition of density organic matter fractions of subtropical native pasture soilsOtávio dos Anjos Leal0Graciele Sarante Santana1Heike Knicker2Francisco J. González-Vila3José A. González-Pérez4Deborah Pinheiro Dick5Institute of Bio- and Geosciences—Agrosphere (IBG-3), Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, 52428 Jülich, Germany; Corresponding author.Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Porto Alegre 91501-970, BrazilInstituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS-CSIC), Av. Reina Mercedes 10, 41012 Seville, Spain; Instituto de la Grasa (IG-CSIC), Campus de la Universidad Pablo de Olavide, Edificio 46, Ctra. de Utrera, km 1, 41013 Seville, SpainInstituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS-CSIC), Av. Reina Mercedes 10, 41012 Seville, SpainInstituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS-CSIC), Av. Reina Mercedes 10, 41012 Seville, SpainInstituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves, 9500, Porto Alegre 91501-970, BrazilIn Southern Brazil, exotic species as Acacia (A) and Eucalyptus (E) are often planted over native pasturelands and may change bulk soil organic matter (SOM) composition as verified in our previous study with Cambisols (0–5 cm). Here we aimed to follow the impact of seven-year A and E plantation on the composition of the free light- (FLF), occluded light- (OLF) and heavy fraction (HF) of SOM along the soil profile. We hypothesized that A and E may have shifted the molecular composition and carbon (C) stocks (Cs) of SOM fractions, at least at 0–5 cm; with stronger shifts caused by A due to greater E litter recalcitrance. Litter and soil samples (0–20 cm) were collected at A and E and neighboring native pasturelands without A (WA) and without E (WE). Litter, FLF, OLF and HF samples were subjected to C, nitrogen (N), pyrolysis–gas chromatography/mass spectrometry (Py-GC/MS) and lipid biomarkers analysis. In E soil, the Cs of FLF at 0–5 cm (0.5 Mg ha−1) and OLF at 5–10 cm (1.7 Mg ha−1) were 194 and 70 % greater than in WE, whereas in A soil the Cs of OLF at 0–5 cm (0.2 Mg ha−1) was 44 % lower than in WA. Nevertheless, A changed more remarkably the composition of SOM fractions, confirming our hypothesis partially, likely due to greater A litter biodegradability (<C:N ratio, <aromatic and polyaromatic and >polysaccharides abundance) compared to E. The contribution of A litter to FLF (0–10 cm) was evidenced by abundance of long chain and the predominance of odd-over-even n-alkanes (particularly >C29), and to OLF (0–20 cm) by the greatest abundance of n-alkanes at C31, resembling A litter. Loss of C and N of OLF in A compared to WA (0–5 cm) was compensated by fresh A litter additions to FLF and OLF and microbial-derived compounds association to soil minerals, equaling soil Cs in A and WA. The lower soil N stock in A compared to WA likely resulted from depletion of occluded microbial-derived N-compounds, supposedly reflecting the breakdown of soil aggregates at forest plantation. The increase of Cs in FLF and OLF of E compared to WE soil was associated with increased abundance of aromatics and n-alkane/alkenes and decrease of fatty acids. Similar patterns of n-alkanes observed for OLF of E and WE soil confirmed the incipient contribution of E litter to OLF. Conversion of these pastures to A and E modifies SOM composition and protection, requiring policies in view of the highly invasive potential and possible negative implications of A and E to native pasture regeneration.http://www.sciencedirect.com/science/article/pii/S0016706123004226BrazilDensity fractionsPy-GC/MSPCAn-alkanesMolecular proxies |
| spellingShingle | Otávio dos Anjos Leal Graciele Sarante Santana Heike Knicker Francisco J. González-Vila José A. González-Pérez Deborah Pinheiro Dick Acacia and Eucalyptus plantations modify the molecular composition of density organic matter fractions of subtropical native pasture soils Geoderma Brazil Density fractions Py-GC/MS PCA n-alkanes Molecular proxies |
| title | Acacia and Eucalyptus plantations modify the molecular composition of density organic matter fractions of subtropical native pasture soils |
| title_full | Acacia and Eucalyptus plantations modify the molecular composition of density organic matter fractions of subtropical native pasture soils |
| title_fullStr | Acacia and Eucalyptus plantations modify the molecular composition of density organic matter fractions of subtropical native pasture soils |
| title_full_unstemmed | Acacia and Eucalyptus plantations modify the molecular composition of density organic matter fractions of subtropical native pasture soils |
| title_short | Acacia and Eucalyptus plantations modify the molecular composition of density organic matter fractions of subtropical native pasture soils |
| title_sort | acacia and eucalyptus plantations modify the molecular composition of density organic matter fractions of subtropical native pasture soils |
| topic | Brazil Density fractions Py-GC/MS PCA n-alkanes Molecular proxies |
| url | http://www.sciencedirect.com/science/article/pii/S0016706123004226 |
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