Dataset Information

Nitrogen isotopic signatures and fluxes of N₂O in response to land-use change on naturally occurring saline-alkaline soil.

ABSTRACT: The conversion of natural grassland to semi-natural or artificial ecosystems is a large-scale land-use change (LUC) commonly occurring to saline-alkaline land. Conversion of natural to artificial ecosystems, with addition of anthropogenic nitrogen (N) fertilizer, influences N availability in the soil that may result in higher N₂O emission along with depletion of ¹⁵N, while converting from natural to semi-natural the influence may be small. So, this study assesses the impact of LUC on N₂O emission and ¹⁵N in N₂O emitted from naturally occurring saline-alkaline soil when changing from natural grassland (Phragmites australis) to semi-natural [Tamarix chinensis (Tamarix)] and to cropland (Gossypium spp.). The grassland and Tamarix ecosystems were not subject to any management practice, while the cropland received fertilizer and irrigation. Overall, median N₂O flux was significantly different among the ecosystems with the highest from the cropland (25.3 N₂O-N µg m^-2 h^-1), intermediate (8.2 N₂O-N µg m^-2 h^-1) from the Tamarix and the lowest (4.0 N₂O-N µg m^-2 h^-1) from the grassland ecosystem. The ¹⁵N isotopic signatures in N₂O emitted from the soil were also significantly affected by the LUC with more depleted from cropland (- 25.3 ‰) and less depleted from grassland (- 0.18 ‰). Our results suggested that the conversion of native saline-alkaline grassland with low N to Tamarix or cropland is likely to result in increased soil N₂O emission and also contributes significantly to the depletion of the ¹⁵N in atmospheric N₂O, and the contribution of anthropogenic N addition was found more significant than any other processes.

SUBMITTER: Timilsina A

PROVIDER: S-EPMC7718238 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature

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Nitrogen isotopic signatures and fluxes of N2O in response to land-use change on naturally occurring saline-alkaline soil.

Timilsina Arbindra A Dong Wenxu W Luo Jiafa J Lindsey Stuart S Wang Yuying Y Hu Chunsheng C

Scientific reports 20201204 1

The conversion of natural grassland to semi-natural or artificial ecosystems is a large-scale land-use change (LUC) commonly occurring to saline-alkaline land. Conversion of natural to artificial ecosystems, with addition of anthropogenic nitrogen (N) fertilizer, influences N availability in the soil that may result in higher N2O emission along with depletion of 15N, while converting from natural to semi-natural the influence may be small. So, this study assesses the impact ...[more]

PMID: 33277591

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Project description:Body tissues are generally 15N-enriched over the diet, with a discrimination factor (?15N) that varies among tissues and individuals as a function of their nutritional and physiopathological condition. However, both 15N bioaccumulation and intra- and inter-individual ?15N variations are still poorly understood, so that theoretical models are required to understand their underlying mechanisms. Using experimental ?15N measurements in rats, we developed a multi-compartmental model that provides the first detailed representation of the complex functioning of the body's ?15N system, by explicitly linking the sizes and ?15N values of 21 nitrogen pools to the rates and isotope effects of 49 nitrogen metabolic fluxes. We have shown that (i) besides urea production, several metabolic pathways (e.g., protein synthesis, amino acid intracellular metabolism, urea recycling and intestinal absorption or secretion) are most probably associated with isotope fractionation and together contribute to 15N accumulation in tissues, (ii) the ?15N of a tissue at steady-state is not affected by variations of its P turnover rate, but can vary according to the relative orientation of tissue free amino acids towards oxidation vs. protein synthesis, (iii) at the whole-body level, ?15N variations result from variations in the body partitioning of nitrogen fluxes (e.g., urea production, urea recycling and amino acid exchanges), with or without changes in nitrogen balance, (iv) any deviation from the optimal amino acid intake, in terms of both quality and quantity, causes a global rise in tissue ?15N, and (v) ?15N variations differ between tissues depending on the metabolic changes involved, which can therefore be identified using simultaneous multi-tissue ?15N measurements. This work provides proof of concept that ?15N measurements constitute a new promising tool to investigate how metabolic fluxes are nutritionally or physiopathologically reorganized or altered. The existence of such natural and interpretable isotopic biomarkers promises interesting applications in nutrition and health.

Dataset Information

Nitrogen isotopic signatures and fluxes of N₂O in response to land-use change on naturally occurring saline-alkaline soil.

Publications

Nitrogen isotopic signatures and fluxes of N<sub>2</sub>O in response to land-use change on naturally occurring saline-alkaline soil.

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