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<p><UnorderedList Mark="Bullet"> <ItemContent> <p>Nitrogen addition promoted litter decomposition in semi-arid grasslands.</p> </ItemContent> <ItemContent> <p>Decomposition of high-nitrogen litter was inhibited.</p> </ItemContent> <ItemContent> <p>N:P ratios in low-N litter remained stable throughout decomposition.</p> </ItemContent> <ItemContent> <p>Fungal/bacterial intra-kingdom interactions were mainly positive.</p> </ItemContent> <ItemContent> <p>These findings can improve predictive models of litter decomposition under changing nutrient inputs.</p> </ItemContent> </UnorderedList></p><p>The nitrogen (N) input can exert a dual effect on litter decomposition, depending on the litter quality. Additionally, increased N input alters plant nutrient composition, which directly impacts plant residue decomposition. However, this effect remains understudied, particularly in grassland ecosystems. We obtained two types of <i>Leymus chinensis</i> litter (low-N and high-N) from a long-term N addition experiment. A 730-day litter decomposition experiment was conducted to examine mass loss, nutrient release, stoichiometric changes, and microbial community dynamics. The results show that N addition increased litter mass loss by approximately 10.55%, and the mass loss of low-N litter increased by 10.14%. Furthermore, acid-unhydrolyzable residue accumulated over time, with greater accumulation in high-N litter, which may be a key factor underlying the slower decomposition of high-N litter. Another key factor may be the persistently high N:P ratio in high-N litter during decomposition, potentially making it more susceptible to P limitation. Our findings highlight that changes in litter quality under exogenous nutrient inputs play a key role in regulating decomposition, offering insights to improve predictive models of litter decomposition under changing nutrient inputs.</p>

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Elevated plant nitrogen suppresses post-senescence decomposition: A novel mechanism in nitrogen-enriched ecosystems

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Zhanbo Yang,
  • Jingjing Yang,
  • Jiale Shao,
  • Jialiang Yao,
  • Jushan Liu

摘要

Nitrogen addition promoted litter decomposition in semi-arid grasslands.

Decomposition of high-nitrogen litter was inhibited.

N:P ratios in low-N litter remained stable throughout decomposition.

Fungal/bacterial intra-kingdom interactions were mainly positive.

These findings can improve predictive models of litter decomposition under changing nutrient inputs.

The nitrogen (N) input can exert a dual effect on litter decomposition, depending on the litter quality. Additionally, increased N input alters plant nutrient composition, which directly impacts plant residue decomposition. However, this effect remains understudied, particularly in grassland ecosystems. We obtained two types of Leymus chinensis litter (low-N and high-N) from a long-term N addition experiment. A 730-day litter decomposition experiment was conducted to examine mass loss, nutrient release, stoichiometric changes, and microbial community dynamics. The results show that N addition increased litter mass loss by approximately 10.55%, and the mass loss of low-N litter increased by 10.14%. Furthermore, acid-unhydrolyzable residue accumulated over time, with greater accumulation in high-N litter, which may be a key factor underlying the slower decomposition of high-N litter. Another key factor may be the persistently high N:P ratio in high-N litter during decomposition, potentially making it more susceptible to P limitation. Our findings highlight that changes in litter quality under exogenous nutrient inputs play a key role in regulating decomposition, offering insights to improve predictive models of litter decomposition under changing nutrient inputs.