Scholarlink

<p>Denitrification is the key process leading to production and loss of nitrogen gases from soils. Its main drivers are N availability and soil water content, but interactions with other elements, such as carbon and phosphorus, can also influence N<sub>2</sub>O formation. So far, robust information on the effects of P and the historical context of P addition on N<sub>2</sub>O sources remains limited. To address this knowledge gap, we conducted a mesocosm chamber experiment using isotopic approaches to investigate N transformations and N<sub>2</sub>O sources following P fertilizer addition in soils with varying histories of P fertilization (low and high P). Differences in long-term fertilization affected C, N, and P availability as well as microbial community composition and nutrient cycling processes. Initially, microbes in both soils were C-limited with slightly higher C availability and microbial respiration in high P soils. Low P availability in low P soil did not restrict denitrification. In contrast, long-term P-unfertilized soil had higher N<sub>2</sub>O losses compared to high P soil, which were further stimulated with P addition. Glucose addition alleviated C limitation and strongly promoted microbial growth and respiration, but did not affect N<sub>2</sub>O emissions among treatments. Bacterial denitrification and nitrifier denitrification were the main N<sub>2</sub>O forming processes, while dissimilatory nitrate reduction to ammonium (DNRA) contributed to NO<sub>3</sub><sup>−</sup> reduction, but only slightly to N<sub>2</sub>O formation.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Nitrous oxide fluxes, their sources, and soil microbial communities depend more on carbon availability than long- and short-term phosphorus addition

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年3月24日

查看全文
  • Pauline Sophie Rummel,
  • Anthony Imoudu Oyeogbe,
  • Haitao Wang,
  • Tim Urich,
  • Nicole Wrage-Mönnig

摘要

Denitrification is the key process leading to production and loss of nitrogen gases from soils. Its main drivers are N availability and soil water content, but interactions with other elements, such as carbon and phosphorus, can also influence N2O formation. So far, robust information on the effects of P and the historical context of P addition on N2O sources remains limited. To address this knowledge gap, we conducted a mesocosm chamber experiment using isotopic approaches to investigate N transformations and N2O sources following P fertilizer addition in soils with varying histories of P fertilization (low and high P). Differences in long-term fertilization affected C, N, and P availability as well as microbial community composition and nutrient cycling processes. Initially, microbes in both soils were C-limited with slightly higher C availability and microbial respiration in high P soils. Low P availability in low P soil did not restrict denitrification. In contrast, long-term P-unfertilized soil had higher N2O losses compared to high P soil, which were further stimulated with P addition. Glucose addition alleviated C limitation and strongly promoted microbial growth and respiration, but did not affect N2O emissions among treatments. Bacterial denitrification and nitrifier denitrification were the main N2O forming processes, while dissimilatory nitrate reduction to ammonium (DNRA) contributed to NO3− reduction, but only slightly to N2O formation.