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首页> 外文期刊>Environmental Science & Technology: ES&T >Nitrogen Enrichment during Soil Organic Matter Burning and Molecular Evidence of Maillard Reactions
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Nitrogen Enrichment during Soil Organic Matter Burning and Molecular Evidence of Maillard Reactions

机译：Nitrogen Enrichment during Soil Organic Matter Burning and Molecular Evidence of Maillard Reactions

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摘要

Wildfires in forested watersheds dramatically alter stored and labile soil organic matter (SOM) pools and the export of dissolved organic matter (DOM). Ecosystem recovery after wildfires depends on soil microbial communities and revegetation and therefore is limited by the availability of nutrients, such as nitrogen-containing and labile, water-soluble compounds. However, SOM byproducts produced at different wildfire intensities are poorly understood, leading to difficulties in assessing wildfire severity and predicting ecosystem recovery. In this work, waterextractable organic matter (WEOM) from laboratory microcosms of soil burned at discrete temperatures was characterized by mass spectrometry to study the impacts of fire temperature on SOM and DOM composition. The molecular composition derived from different burn temperatures indicated that nitrogencontaining byproducts were enriched with heating and composed of a wide range of aromatic features and oxidation states. Mass difference-based analysis also suggested that products formed during heating could be modeled using transformations along the Maillard reaction pathway. The enrichment of N-containing SOM and DOM at different soil burning intensities has important implications for ecosystem recovery and downstream water quality.

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