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Purpose <p>Soil organic phosphorus is vital for plant growth and function, but there is still largely restricted to learning about how co-adding nitrogen (N) and phosphorus (P) affects the soil OP dynamics.</p> Methods <p>We researched the impacts of different P compound addition [KH<sub>2</sub>PO<sub>4</sub> (P<sub>K</sub>) vs. Ca(H<sub>2</sub>PO<sub>4</sub>)<sub>2</sub> (P<sub>Ca</sub>)] at rates of 0, 2, 4, 6, 8, and 10&#xa0;g P m<sup>− 2</sup> yr<sup>− 1</sup> combined with two-level N (NH<sub>4</sub>NO<sub>3</sub>) addition (0 and 10&#xa0;g N m<sup>− 2</sup> yr<sup>− 1</sup>) on soil labile, moderate-labile, moderate-stable, and high-stable organic P concentrations in a meadow steppe.</p> Results <p>Results showed that P<sub>K</sub> addition resulted in higher soil labile and high-stable organic P concentrations than P<sub>Ca</sub> addition. P addition enhanced the concentration of soil labile organic P regardless of P compound form. P addition alone showed no impact on soil moderate-stable organic P. Compared with P addition alone, combined N and P<sub>K</sub> addition increased soil labile, moderate-labile and high-stable organic P concentrations, while combined N and P<sub>Ca</sub> addition significantly decreased moderate-labile and moderate-stable organic P.</p> Conclusion <p>Our results highlighted that soil labile organic P is critical to the P cycle in grassland, and the P compound forms need to be taken into account when managing grasslands related to P utilization.</p>

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Effects of exogenous phosphorus compounds interact with nitrogen addition on soil organic phosphorus fractions in a meadow steppe

  • 期刊论文

  • 发表日期：

    2025年2月27日

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  • Jiayun Zhang,
  • Chunbo Li,
  • Xinyue Jin,
  • Yinhong Liao,
  • Xiaomeng Ma,
  • Yuxue Zhang,
  • Jishuai Su,
  • Hongyi Wang,
  • Heyong Liu,
  • Yong Jiang

摘要

Purpose

Soil organic phosphorus is vital for plant growth and function, but there is still largely restricted to learning about how co-adding nitrogen (N) and phosphorus (P) affects the soil OP dynamics.

Methods

We researched the impacts of different P compound addition [KH2PO4 (PK) vs. Ca(H2PO4)2 (PCa)] at rates of 0, 2, 4, 6, 8, and 10 g P m− 2 yr− 1 combined with two-level N (NH4NO3) addition (0 and 10 g N m− 2 yr− 1) on soil labile, moderate-labile, moderate-stable, and high-stable organic P concentrations in a meadow steppe.

Results

Results showed that PK addition resulted in higher soil labile and high-stable organic P concentrations than PCa addition. P addition enhanced the concentration of soil labile organic P regardless of P compound form. P addition alone showed no impact on soil moderate-stable organic P. Compared with P addition alone, combined N and PK addition increased soil labile, moderate-labile and high-stable organic P concentrations, while combined N and PCa addition significantly decreased moderate-labile and moderate-stable organic P.

Conclusion

Our results highlighted that soil labile organic P is critical to the P cycle in grassland, and the P compound forms need to be taken into account when managing grasslands related to P utilization.