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Background and aims <p>Grazing activities influence grassland ecosystem functions by altering the competitive dynamics for nitrogen between plants and microorganisms. How does livestock assembly influence the allocation balance of nitrogen pools through changes in soil nitrogen dynamics remains unclear in the field of ecosystem nutrient management.</p> Methods <p>This study established the following treatments: no grazing (CK), yak-only grazing (YG), Tibetan sheep-only grazing (SG), and mixed yak-sheep grazing (MG1:2, MG1:4, MG1:6). Through systematic monitoring of plant communities, soil, and microbial biomass, we investigated the effects of different grazing regimes on the total plant community nitrogen pool (TNP) and the microbial biomass nitrogen pool (MBNP).</p> Results <p>YG and SG had no effect on TNP, but mixed grazing significantly reduced TNP, with no differences among mixed treatments. All grazing increased MBNP; among mixed treatments, MG1:6 had significantly higher MBNP than the other two. Multiple regression analysis showed that among soil properties, dissolved organic carbon (DOC), dissolved organic nitrogen (DON) and soil total phosphorus (STP) were significantly associated to TNP, while ammonium nitrogen (SAN), STP, DOC and DON were significantly associated to MBNP. Furthermore, SEM analysis revealed that grazing indirectly enhance MBNP through its positive effects on DON and SAN.</p> Conclusions <p>These findings indicated that even under the same grazing intensity, mixed grazing exerted different effects on the nitrogen distribution balance from single species grazing. Grazing indirectly affected MBNP due to the significant positive correlation of MBNP with both DON and SAN.</p>

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Grazing-induced reallocation of nitrogen between plants and soil microorganisms in an alpine grassland in the Qinghai Lake Basin

  • 期刊论文

  • 发表日期：

    2026年7月31日

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  • Weidong Lv,
  • Quanmin Dong,
  • Caicai Sun,
  • Yuzhen Liu,
  • Mengqi Li,
  • Zhenxiang Zhang,
  • Wenting Liu,
  • Xiaoxia Yang

摘要

Background and aims

Grazing activities influence grassland ecosystem functions by altering the competitive dynamics for nitrogen between plants and microorganisms. How does livestock assembly influence the allocation balance of nitrogen pools through changes in soil nitrogen dynamics remains unclear in the field of ecosystem nutrient management.

Methods

This study established the following treatments: no grazing (CK), yak-only grazing (YG), Tibetan sheep-only grazing (SG), and mixed yak-sheep grazing (MG1:2, MG1:4, MG1:6). Through systematic monitoring of plant communities, soil, and microbial biomass, we investigated the effects of different grazing regimes on the total plant community nitrogen pool (TNP) and the microbial biomass nitrogen pool (MBNP).

Results

YG and SG had no effect on TNP, but mixed grazing significantly reduced TNP, with no differences among mixed treatments. All grazing increased MBNP; among mixed treatments, MG1:6 had significantly higher MBNP than the other two. Multiple regression analysis showed that among soil properties, dissolved organic carbon (DOC), dissolved organic nitrogen (DON) and soil total phosphorus (STP) were significantly associated to TNP, while ammonium nitrogen (SAN), STP, DOC and DON were significantly associated to MBNP. Furthermore, SEM analysis revealed that grazing indirectly enhance MBNP through its positive effects on DON and SAN.

Conclusions

These findings indicated that even under the same grazing intensity, mixed grazing exerted different effects on the nitrogen distribution balance from single species grazing. Grazing indirectly affected MBNP due to the significant positive correlation of MBNP with both DON and SAN.