Unveiling the age and origin of biogenic aggregates produced by earthworm species with their NIRS fingerprint in a subalpine meadow of Central Pyrenees.
| Title: | Unveiling the age and origin of biogenic aggregates produced by earthworm species with their NIRS fingerprint in a subalpine meadow of Central Pyrenees. |
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| Authors: | Domínguez-Haydar, Yamileth, Velásquez, Elena, Zangerlé, Anne, Lavelle, Patrick, Gutiérrez-Eisman, Silvia, Jiménez, Juan J. |
| Source: | PLoS ONE; 8/12/2020, Vol. 15 Issue 8, p1-24, 24p |
| Subject Terms: | EARTHWORMS, SOIL structure, PARTIAL least squares regression, MEADOWS, SOIL classification, SIGNAL sampling, MOUNTAIN soils |
| Abstract: | In this study the near-infrared reflectance (NIR) spectra signals (750–2,500 nm) of soil samples was compared with the NIR signals of the biogenic aggregates produced in the lab by three earthworm species, i.e., Aporrectodea rosea (Savigny 1826), Lumbricus friendi Cognetti, 1904 and Prosellodrilus pyrenaicus (Cognetti, 1904) from subalpine meadows in the Central Pyrenees. NIR spectral signatures of biogenic aggregates, root-aggregates, and non-aggregated soil were obtained together with soil carbon (C), nitrogen (N), NH4+ and NO3- determinations. The concentrations of C, N and C:N ratio in the three types of soil aggregates identified were not statistically significant (ANOVA, p>0.05) although non-macroaggregated soil had slightly higher C concentrations (66.3 g kg-1 dry soil) than biogenic aggregates (earthworm- and root-aggregates, 64.9 and 63.5 g kg-1 dry soil, respectively), while concentrations of NH4+ and NO3- were highest in the root-attached aggregates (3.3 and 0.31 mg kg dry soil-1). Total earthworm density and biomass in the sampled area was 137.6 ind. m-2, and 55.2 g fresh weight m-2, respectively. The biomass of aggregates attached to roots and non-macroaggregated soil was 122.3 and 134.8 g m-2, respectively, while biomass of free (particulate) organic matter and invertebrate biogenic aggregates was 62.9 and 41.7 g m-2, respectively. Multivariate analysis of NIR spectra signals of field aggregates separated root aggregates with high concentrations of NH4+ and NO3- (41.5% of explained variance, axis I) from those biogenic aggregates, including root aggregates, with large concentrations of C and high C:N ratio (21.6% of total variability, axis II). Partial Least Square (PLS) regressions were used to compare NIR spectral signals of samples (casts and soil) and develop calibration equations relating these spectral data to those data obtained for chemical variables in the lab. After a derivatization process, the NIR spectra of field aggregates were projected onto the PLS factorial plane of the NIR spectra from the lab incubation. The projection of the NIR spectral signals onto the PLSR models for C, N, NH4+ and NO3- from casts produced and incubated in the lab allowed us to identify the species and the age of the field biogenic aggregates. Our hypothesis was to test whether field aggregates would match or be in the vicinity of the NIR signals that corresponded to a certain species and the age of the depositions produced in the lab. A NIRS biogenic background noise (BBN) is present in the soil as a result of earthworm activity. This study provides insights on how to analyse the role of these organisms in important ecological processes of soil macro-aggregation and associated organic matter dynamics by means of analyzing the BBN in the soil matrix. [ABSTRACT FROM AUTHOR] |
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| Items | – Name: Title Label: Title Group: Ti Data: Unveiling the age and origin of biogenic aggregates produced by earthworm species with their NIRS fingerprint in a subalpine meadow of Central Pyrenees. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Domínguez-Haydar%2C+Yamileth%22">Domínguez-Haydar, Yamileth</searchLink><br /><searchLink fieldCode="AR" term="%22Velásquez%2C+Elena%22">Velásquez, Elena</searchLink><br /><searchLink fieldCode="AR" term="%22Zangerlé%2C+Anne%22">Zangerlé, Anne</searchLink><br /><searchLink fieldCode="AR" term="%22Lavelle%2C+Patrick%22">Lavelle, Patrick</searchLink><br /><searchLink fieldCode="AR" term="%22Gutiérrez-Eisman%2C+Silvia%22">Gutiérrez-Eisman, Silvia</searchLink><br /><searchLink fieldCode="AR" term="%22Jiménez%2C+Juan+J%2E%22">Jiménez, Juan J.</searchLink> – Name: TitleSource Label: Source Group: Src Data: PLoS ONE; 8/12/2020, Vol. 15 Issue 8, p1-24, 24p – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22EARTHWORMS%22">EARTHWORMS</searchLink><br /><searchLink fieldCode="DE" term="%22SOIL+structure%22">SOIL structure</searchLink><br /><searchLink fieldCode="DE" term="%22PARTIAL+least+squares+regression%22">PARTIAL least squares regression</searchLink><br /><searchLink fieldCode="DE" term="%22MEADOWS%22">MEADOWS</searchLink><br /><searchLink fieldCode="DE" term="%22SOIL+classification%22">SOIL classification</searchLink><br /><searchLink fieldCode="DE" term="%22SIGNAL+sampling%22">SIGNAL sampling</searchLink><br /><searchLink fieldCode="DE" term="%22MOUNTAIN+soils%22">MOUNTAIN soils</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: In this study the near-infrared reflectance (NIR) spectra signals (750–2,500 nm) of soil samples was compared with the NIR signals of the biogenic aggregates produced in the lab by three earthworm species, i.e., Aporrectodea rosea (Savigny 1826), Lumbricus friendi Cognetti, 1904 and Prosellodrilus pyrenaicus (Cognetti, 1904) from subalpine meadows in the Central Pyrenees. NIR spectral signatures of biogenic aggregates, root-aggregates, and non-aggregated soil were obtained together with soil carbon (C), nitrogen (N), NH4+ and NO3- determinations. The concentrations of C, N and C:N ratio in the three types of soil aggregates identified were not statistically significant (ANOVA, p>0.05) although non-macroaggregated soil had slightly higher C concentrations (66.3 g kg<superscript>-1</superscript> dry soil) than biogenic aggregates (earthworm- and root-aggregates, 64.9 and 63.5 g kg<superscript>-1</superscript> dry soil, respectively), while concentrations of NH4+ and NO3- were highest in the root-attached aggregates (3.3 and 0.31 mg kg dry soil<superscript>-1</superscript>). Total earthworm density and biomass in the sampled area was 137.6 ind. m<superscript>-2</superscript>, and 55.2 g fresh weight m<superscript>-2</superscript>, respectively. The biomass of aggregates attached to roots and non-macroaggregated soil was 122.3 and 134.8 g m<superscript>-2</superscript>, respectively, while biomass of free (particulate) organic matter and invertebrate biogenic aggregates was 62.9 and 41.7 g m<superscript>-2</superscript>, respectively. Multivariate analysis of NIR spectra signals of field aggregates separated root aggregates with high concentrations of NH4+ and NO3- (41.5% of explained variance, axis I) from those biogenic aggregates, including root aggregates, with large concentrations of C and high C:N ratio (21.6% of total variability, axis II). Partial Least Square (PLS) regressions were used to compare NIR spectral signals of samples (casts and soil) and develop calibration equations relating these spectral data to those data obtained for chemical variables in the lab. After a derivatization process, the NIR spectra of field aggregates were projected onto the PLS factorial plane of the NIR spectra from the lab incubation. The projection of the NIR spectral signals onto the PLSR models for C, N, NH4+ and NO3- from casts produced and incubated in the lab allowed us to identify the species and the age of the field biogenic aggregates. Our hypothesis was to test whether field aggregates would match or be in the vicinity of the NIR signals that corresponded to a certain species and the age of the depositions produced in the lab. A NIRS biogenic background noise (BBN) is present in the soil as a result of earthworm activity. This study provides insights on how to analyse the role of these organisms in important ecological processes of soil macro-aggregation and associated organic matter dynamics by means of analyzing the BBN in the soil matrix. [ABSTRACT FROM AUTHOR] – Name: Abstract Label: Group: Ab Data: <i>Copyright of PLoS ONE is the property of Public Library of Science and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1371/journal.pone.0237115 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 24 StartPage: 1 Subjects: – SubjectFull: EARTHWORMS Type: general – SubjectFull: SOIL structure Type: general – SubjectFull: PARTIAL least squares regression Type: general – SubjectFull: MEADOWS Type: general – SubjectFull: SOIL classification Type: general – SubjectFull: SIGNAL sampling Type: general – SubjectFull: MOUNTAIN soils Type: general Titles: – TitleFull: Unveiling the age and origin of biogenic aggregates produced by earthworm species with their NIRS fingerprint in a subalpine meadow of Central Pyrenees. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Domínguez-Haydar, Yamileth – PersonEntity: Name: NameFull: Velásquez, Elena – PersonEntity: Name: NameFull: Zangerlé, Anne – PersonEntity: Name: NameFull: Lavelle, Patrick – PersonEntity: Name: NameFull: Gutiérrez-Eisman, Silvia – PersonEntity: Name: NameFull: Jiménez, Juan J. IsPartOfRelationships: – BibEntity: Dates: – D: 12 M: 08 Text: 8/12/2020 Type: published Y: 2020 Identifiers: – Type: issn-print Value: 19326203 Numbering: – Type: volume Value: 15 – Type: issue Value: 8 Titles: – TitleFull: PLoS ONE Type: main |
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