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Aims <p>Soil salinization degrades aggregate structure, diminishes soil organic carbon (SOC), and constrains phosphorus (P) availability, thereby undermining soil fertility and crop productivity. Consequently, strengthening SOC stability, rebuilding aggregates, and improving P bioavailability is essential for the sustainable use of saline–alkaline paddy soils.</p> Methods <p>A field experiment with two factors was arranged, including two P levels (0 and 32.7&#xa0;kg&#xa0;ha<sup>−1</sup> P) and three HA treatments (0, 68 and 135&#xa0;kg&#xa0;ha<sup>−1</sup>), to evaluate the effects of the co-application of humic acid (HA) and P fertilizer on SOC storage and P bioavailability in saline alkali paddy soils.</p> Results <p>Under both P levels, compared with HA0, SOC content in HA1 and HA2 was significantly increased, in which it was highest in P1HA2 treatment. Meanwhile, the proportion of large macroaggregates (LMA) was significantly increased with HA addition. In LMA fraction, polysaccharide-like C and aliphatic-C in P1HA2 treatment were 18.6% and 17.6% higher than that in P0HA0. In addition, specific carbon mineralization rate (SCMR) was decreased with HA application. Compared with P0 level, the content of Ca<sub>2</sub>-P and Ca<sub>8</sub>-P in P1 level was significantly increased, especially in HA2 treatment. And the highest content of available phosphorous (AP) was also found in P1HA2, which was 14.3% higher than that in HA0. SOC was positively associated with Ca₂-P and Ca₈-P, whereas SCMR was negatively associated with labile P.</p> Conclusion <p>Co-applying HA with P fertilizer strengthened macroaggregate structure and increased labile P, thereby enhancing SOC storage and P bioavailability in saline–alkaline paddy soils.</p>

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Co-application of humic acid and phosphorus fertilizer enhances soil carbon stability and phosphorus availability in coastal saline paddy fields

  • 期刊论文

  • 发表日期：

    2026年3月6日

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  • Chuanming Ma,
  • Zhaohui Liu,
  • Ben Cheng,
  • Jinkai Han,
  • Lening Zhang,
  • Zeqiang Sun,
  • Shenglin Liu,
  • Shirong Zhang,
  • Xiaodong Ding

摘要

Aims

Soil salinization degrades aggregate structure, diminishes soil organic carbon (SOC), and constrains phosphorus (P) availability, thereby undermining soil fertility and crop productivity. Consequently, strengthening SOC stability, rebuilding aggregates, and improving P bioavailability is essential for the sustainable use of saline–alkaline paddy soils.

Methods

A field experiment with two factors was arranged, including two P levels (0 and 32.7 kg ha−1 P) and three HA treatments (0, 68 and 135 kg ha−1), to evaluate the effects of the co-application of humic acid (HA) and P fertilizer on SOC storage and P bioavailability in saline alkali paddy soils.

Results

Under both P levels, compared with HA0, SOC content in HA1 and HA2 was significantly increased, in which it was highest in P1HA2 treatment. Meanwhile, the proportion of large macroaggregates (LMA) was significantly increased with HA addition. In LMA fraction, polysaccharide-like C and aliphatic-C in P1HA2 treatment were 18.6% and 17.6% higher than that in P0HA0. In addition, specific carbon mineralization rate (SCMR) was decreased with HA application. Compared with P0 level, the content of Ca2-P and Ca8-P in P1 level was significantly increased, especially in HA2 treatment. And the highest content of available phosphorous (AP) was also found in P1HA2, which was 14.3% higher than that in HA0. SOC was positively associated with Ca₂-P and Ca₈-P, whereas SCMR was negatively associated with labile P.

Conclusion

Co-applying HA with P fertilizer strengthened macroaggregate structure and increased labile P, thereby enhancing SOC storage and P bioavailability in saline–alkaline paddy soils.