Scholarlink

<p> Purpuse Soil aggregates of varying particle sizes create distinct microhabitats due to differences in matrix and pore structure, which are regarded as biochemical reactors for nitrous oxide (N<sub>2</sub>O). The integrated rice–crayfish (RC) system represents an ecological approach to rice farming. However, limited research has investigated the effects of RC farming on N<sub>2</sub>O emissions, particularly concerning different soil aggregate levels. Methods This study explored the differences in N<sub>2</sub>O emissions from soil aggregate between RC and rice monoculture (RM) systems in a fluvo-aquic soils under a 8-year field experiment. A 40-day laboratory incubation was performed at 25◦C, and N<sub>2</sub>O emissions were measured among three aggregate fraction (&gt; 2&#xa0;mm, 0.25–2&#xa0;mm, &lt; 0.25&#xa0;mm) and two soil depths (topsoil: 0–20&#xa0;cm, subsoil: 20–40&#xa0;cm). Results The results show that RC significantly increased N<sub>2</sub>O emissions, particularly in &gt; 2&#xa0;mm fraction in the topsoil. When considering cumulative N<sub>2</sub>O emissions across all aggregate size fractions, potential cumulative N<sub>2</sub>O emissions in the topsoil under RC were 4.38 times higher than RM, while no significant difference was observed in the subsoil. The temporal analysis revealed that topsoil N<sub>2</sub>O emissions were more balanced across the first three periods (1–4, 4–10, and 10–20 d), whereas subsoil emissions peaked in the period 2 (4–10 d), accounting for 67.6%–71.9% of the total. Key factors influencing N<sub>2</sub>O emissions included pH, NO<sub>3</sub>⁻-N, dissolved organic carbon (DOC), total carbon, and available phosphorus in the topsoil, while DOC and pH were crucial in the subsoil. Conclusions These findings highlight the critical role of soil aggregation and depth in N<sub>2</sub>O emissions and underscore the ecological implications of the RC farming system. The significant increase in emissions from larger aggregates suggests that modifying soil structure could potentially mitigate greenhouse gas emissions and improve the sustainability of agricultural practices.</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

Long-Term Rice-Crayfish Co-Culture Increases N2O Emission From Soil Aggregates But Depends on Soil Depth in a Fluvo-Aquic Soil

  • 期刊论文

  • 发表日期：

    2026年5月26日

查看全文
  • Feng He,
  • Yong Zhou,
  • Wei Yang,
  • Hongxiang Zhu,
  • Dengwen Zhou,
  • Hongrui Dong,
  • Jiangwen Nie,
  • Zhangyong Liu,
  • Bo Zhu

摘要

Purpuse Soil aggregates of varying particle sizes create distinct microhabitats due to differences in matrix and pore structure, which are regarded as biochemical reactors for nitrous oxide (N2O). The integrated rice–crayfish (RC) system represents an ecological approach to rice farming. However, limited research has investigated the effects of RC farming on N2O emissions, particularly concerning different soil aggregate levels. Methods This study explored the differences in N2O emissions from soil aggregate between RC and rice monoculture (RM) systems in a fluvo-aquic soils under a 8-year field experiment. A 40-day laboratory incubation was performed at 25◦C, and N2O emissions were measured among three aggregate fraction (> 2 mm, 0.25–2 mm, < 0.25 mm) and two soil depths (topsoil: 0–20 cm, subsoil: 20–40 cm). Results The results show that RC significantly increased N2O emissions, particularly in > 2 mm fraction in the topsoil. When considering cumulative N2O emissions across all aggregate size fractions, potential cumulative N2O emissions in the topsoil under RC were 4.38 times higher than RM, while no significant difference was observed in the subsoil. The temporal analysis revealed that topsoil N2O emissions were more balanced across the first three periods (1–4, 4–10, and 10–20 d), whereas subsoil emissions peaked in the period 2 (4–10 d), accounting for 67.6%–71.9% of the total. Key factors influencing N2O emissions included pH, NO3⁻-N, dissolved organic carbon (DOC), total carbon, and available phosphorus in the topsoil, while DOC and pH were crucial in the subsoil. Conclusions These findings highlight the critical role of soil aggregation and depth in N2O emissions and underscore the ecological implications of the RC farming system. The significant increase in emissions from larger aggregates suggests that modifying soil structure could potentially mitigate greenhouse gas emissions and improve the sustainability of agricultural practices.