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<p>The accumulation of phosphogypsum (PG), a solid byproduct of phosphoric acid production, poses a significant ecological risk to the surrounding environment. Biologically driven <i>in situ</i> remediation represents an eco-friendly approach. Biocrusts play an irreplaceable role in the ecological restoration of degraded ecosystems. However, their potential in PG systems has received limited attention. To explore the interactions between PG and biocrusts, this study sampled PG stockpiles of different ages (0, 2, and 12 years), including the biocrust layer (natural thickness: 2–20 mm) and the underlying PG layer (0–5 cm below the biocrusts). The results showed that the fine particle size of PG (&lt; 100 µm), together with its abundant available phosphorus (AP) and exchangeable calcium ions, provided favorable conditions for biocrust formation and development. After 12 years, total chlorophyll (Tchl), microbial biomass carbon (MBC), and microbial biomass nitrogen (MBN) in the biocrust layer increased by 71.00-fold, 81.37-fold, and 108.37-fold, respectively. Moreover, the PG – biocrust interface interactions enhanced microbial nutrient cycling, particularly the carbon cycle (e.g., inorganic carbon fixation genes increased by 29.11-fold, intracellular polymer degradation by 17.52-fold, and fermentation by 25.59-fold). These biological processes ultimately led to marked improvements in the physicochemical properties of the surface PG layer (0–5 cm). Specifically, soil organic carbon (SOC) increased by 175.28%, pH rose from 3.39 to 5.61, and soluble fluoride content decreased to 14.20% of the original level in PG layer (0–5 cm). Overall, this study provides a potential pathway and a theoretical basis for the <i>in situ</i> green remediation of PG stockpiles.</p>

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Biocrust-phosphogypsum interactions enhance microbial nutrient cycling and surface properties in phosphogypsum stockpiles

  • 期刊论文

  • 发表日期：

    2026年7月28日

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  • Cui Zhang,
  • Jia-qi Tan,
  • Ming Luo,
  • Zhen Wang,
  • Jessica-Viridiana García meza,
  • Zhen-bin Wu,
  • Li Wu,
  • De-long Meng,
  • Mostafa Benzaazoua,
  • Ling Xia

摘要

The accumulation of phosphogypsum (PG), a solid byproduct of phosphoric acid production, poses a significant ecological risk to the surrounding environment. Biologically driven in situ remediation represents an eco-friendly approach. Biocrusts play an irreplaceable role in the ecological restoration of degraded ecosystems. However, their potential in PG systems has received limited attention. To explore the interactions between PG and biocrusts, this study sampled PG stockpiles of different ages (0, 2, and 12 years), including the biocrust layer (natural thickness: 2–20 mm) and the underlying PG layer (0–5 cm below the biocrusts). The results showed that the fine particle size of PG (< 100 µm), together with its abundant available phosphorus (AP) and exchangeable calcium ions, provided favorable conditions for biocrust formation and development. After 12 years, total chlorophyll (Tchl), microbial biomass carbon (MBC), and microbial biomass nitrogen (MBN) in the biocrust layer increased by 71.00-fold, 81.37-fold, and 108.37-fold, respectively. Moreover, the PG – biocrust interface interactions enhanced microbial nutrient cycling, particularly the carbon cycle (e.g., inorganic carbon fixation genes increased by 29.11-fold, intracellular polymer degradation by 17.52-fold, and fermentation by 25.59-fold). These biological processes ultimately led to marked improvements in the physicochemical properties of the surface PG layer (0–5 cm). Specifically, soil organic carbon (SOC) increased by 175.28%, pH rose from 3.39 to 5.61, and soluble fluoride content decreased to 14.20% of the original level in PG layer (0–5 cm). Overall, this study provides a potential pathway and a theoretical basis for the in situ green remediation of PG stockpiles.