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Purpose <p>Phosphorus (P) application and silicon (Si) application enhance primary productivity of agricultural ecosystems. However, the interactive effect between P application and Si application on soil available phosphorus (AP) is not fully understood, especially in grassland.</p> Methods <p>In this experiment, four amounts of P (0 (control (CK)), P49, P98 and P148) and with Si or without Si were added in an alpine meadow of the Qinghai‒Tibet Plateau (QTP) to investigate the effects and mechanisms of P fertilization only and P plus Si on soil phosphorus fractions and AP.</p> Results <p>The concentrations of total P, total Pi, total Po, labile P, moderate P, and stable P, as well as each P component (except for Resin P) increased with the amount of P fertilizer application. At the same P application amount, P + Si application had more significant gains on the various P component and Olsen P concentration than P application alone. On the one hand, Si mobilizes the iron (II) -P phase on the mineral surface to increase the content and proportion of Olsen P. On the other hand, Si increases the environmental threshold and reduce the risk of soil P leaching in the environment.</p> Conclusions <p>Overall, P + Si application is a workable approach for enhancing the concentration of various P fractions, AP concentration and proportion, and the environmental threshold of soil available P in alpine meadow. These results would be helpful to understand the interactive effect of P and Si on the concentration of various P fractions, and provide future fertilization direction for sustainable development of grassland.</p>

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Response of Soil Phosphorus Fractions and Available Phosphorus to Phosphorus Plus Silicon Addition in Alpine Meadows

  • 期刊论文

  • 发表日期：

    2025年8月8日

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  • Yuxin Tang,
  • Danghui Xu,
  • Yuting Yang,
  • Baiying Huang,
  • Xiangwen Fang,
  • Guangqian Yao,
  • Wenhong Zhou,
  • Yuqi Wu

摘要

Purpose

Phosphorus (P) application and silicon (Si) application enhance primary productivity of agricultural ecosystems. However, the interactive effect between P application and Si application on soil available phosphorus (AP) is not fully understood, especially in grassland.

Methods

In this experiment, four amounts of P (0 (control (CK)), P49, P98 and P148) and with Si or without Si were added in an alpine meadow of the Qinghai‒Tibet Plateau (QTP) to investigate the effects and mechanisms of P fertilization only and P plus Si on soil phosphorus fractions and AP.

Results

The concentrations of total P, total Pi, total Po, labile P, moderate P, and stable P, as well as each P component (except for Resin P) increased with the amount of P fertilizer application. At the same P application amount, P + Si application had more significant gains on the various P component and Olsen P concentration than P application alone. On the one hand, Si mobilizes the iron (II) -P phase on the mineral surface to increase the content and proportion of Olsen P. On the other hand, Si increases the environmental threshold and reduce the risk of soil P leaching in the environment.

Conclusions

Overall, P + Si application is a workable approach for enhancing the concentration of various P fractions, AP concentration and proportion, and the environmental threshold of soil available P in alpine meadow. These results would be helpful to understand the interactive effect of P and Si on the concentration of various P fractions, and provide future fertilization direction for sustainable development of grassland.