Transition in the isotopic signatures of fatty-acid soil biomarkers under changing land use: Insights from a multi-decadal chronosequence.

08:00 EDT 19th March 2020 | BioPortfolio

Summary of "Transition in the isotopic signatures of fatty-acid soil biomarkers under changing land use: Insights from a multi-decadal chronosequence."

The effects of climate warming on soil erosion in upland ecosystems will be disproportionately higher than for lowlands due to steeper topography and higher predicted rainfall. Soil erosion may be enhanced by climate warming and upslope shifts in agriculture as conditions for plant growth improve. Identification of eroded-soil sources will inform land management practices that mitigate soil loss and impacts on aquatic receiving environments. Isotopic signatures of plant-derived fatty acid (FA) soil biomarkers can discriminate sediment sources and will detect shifts in land use and natural vegetation toposequences. Accounting for these isotopic shifts requires knowledge of the magnitude and time scale for transition in biomarker signatures. We examined a 30-year chronosequence to quantify the transition in isotopic values of bulk nitrogen, carbon and FA biomarkers following a change from pine forestry to pastoral agriculture in the central North Island of New Zealand. We found the transition in soil biomarker isotopic values was complete within 6 years, with substantial increases in both organic carbon (1% yr) and total N (0.13% yr) of top soils. Subsequent changes were negligible (i.e., <0.04% yr), indicative of a new steady state. Similar patterns were observed in the isotopic signatures of bulk δC and δN values and FA δC values (i.e., ±0.5-0.6‰ yr). Bulk C and N properties and the FAs C14:0, C16:0, C18:2, C24:0 and C26:0 displayed clear transitions from harvested pine to mature pasture. We found evidence that mycorrhizal fungi could disperse and influence soil FA isotopic signatures. This highlights the need to consider both harvested and mature forests in source-tracing studies. Finally, our study shows that near-instantaneous changes in land use associated with agriculture can alter the isotopic signatures of plant biomarkers in soils. This produces a step change that can be readily detected in sedimentary records.


Journal Details

This article was published in the following journal.

Name: The Science of the total environment
ISSN: 1879-1026
Pages: 137850


DeepDyve research library

PubMed Articles [16388 Associated PubMed Articles listed on BioPortfolio]

Seasonal Change in Microbial Diversity and Its Relationship with Soil Chemical Properties in an Orchard.

This study aimed to determine the microbial diversity at different soil depths (0-5 and 5-20 cm) in a subtropical orchard during different seasons (i.e., spring, summer and autumn) to advance knowledg...

Evaluation of fatty acid derivatives in the remediation of aged PAH-contaminated soil and microbial community and degradation gene response.

In this study, derivatives of two common fatty acids in plant root exudates, sodium palmitate and sodium linoleate (sodium aliphatates), were added to an aged Polycyclic aromatic hydrocarbons (PAHs) c...

Effects of hemodialysis on blood fatty acids.

Omega-3 (n-3) fatty acids have beneficial cardiovascular effects, perhaps also in chronic kidney disease (CKD) patients. A low omega-3 index is an independent cardiovascular risk factor in end-stage r...

Potential of lead elemental and isotopic signatures for authenticity and geographical origin of Bordeaux wines.

Lead concentrations and lead isotope ratios of 43 authentic Bordeaux wines from prestigious châteaux and 14 suspicious Bordeaux origin were determined to evaluate their potential for authenticity and...

The vertical migration and speciation of the Pb in the paddy soil: A case study of the Yangtze River Delta, China.

Migration of Pb in the soil can be enhanced by acidification and frequent change of environmental condition. The paddy soil, where the environmental condition such as redox fluctuates frequently due t...

Clinical Trials [7636 Associated Clinical Trials listed on BioPortfolio]

Fatty Acid Supplementation in Children With ASD

The purpose of this study is to examine how fatty acid supplementation alters biological signatures in children with ASD

Fatty Acid Supplementation in Children With ASD (Study 2)

The objective of the protocol is to test the impact of Omega 3-6 on pre-specified biological signatures (IL-1β, IL-2, and IFNγ) and to correlate changes in the biological signatures with ...

Evaluation of Zinc Intake on Essential Fatty Acid Metabolism

The purpose of this study is to determine the effect of different dietary zinc intakes on fatty acid metabolism and other zinc biomarkers

Investigating the Effect of 4-week Omega-3 Polyunsaturated Fatty Acid Supplementation on Inflammation

Investigate the in vivo effects of n-3 PUFA supplementation on inflammation, gene expression and epigenetic signatures. Ex vivo stimulation of peripheral blood mononuclear cells (PBMCs) c...

Fish Oil and Biomarkers of Cardiovascular Risk

Rationale Experimental data indicate an inverse relation between intake of omega-3 fatty acids ('fish oil'), primarily in the form of eicosapentanoic acid (EPA) and docosahexanoic acid (DH...

Medical and Biotech [MESH] Definitions

An unsaturated fatty acid that is the most widely distributed and abundant fatty acid in nature. It is used commercially in the preparation of oleates and lotions, and as a pharmaceutical solvent. (Stedman, 26th ed)

A doubly unsaturated fatty acid, occurring widely in plant glycosides. It is an essential fatty acid in mammalian nutrition and is used in the biosynthesis of prostaglandins and cell membranes. (From Stedman, 26th ed)

A 20-carbon branched chain fatty acid. In phytanic acid storage disease (REFSUM DISEASE) this lipid may comprise as much as 30% of the total fatty acids of the plasma. This is due to a phytanic acid alpha-hydroxylase deficiency.

An enzyme that catalyzes the hydrolysis of a single fatty acid ester bond in lysoglycerophosphatidates with the formation of glyceryl phosphatidates and a fatty acid. EC

A factor associated with the well-being of living organisms that is used as a measure of environmental change and or influence. For example, aldehyde dehydrogenase expression in earthworm tissue is used as an indication of heavy metal pollution in soils. Distinguish from BIOMARKERS.

Quick Search

DeepDyve research library

Searches Linking to this Article