The waterproof and thermal insulation property of foamed concrete is very important. In this study, the ultrafine fly ash (UFA)-based superhydrophobic composite coating was applied onto foam concrete. The UFA-based base coating that closely adhered to the concrete initially improved the waterproofness of the test block, and the silane coupling agent-modified UFA-based surface coating further achieved superhydrophobicity. The UFA on the coating surface and the asperities on the surface jointly formed a lotus leaf-like rough micro–nanostructure. The 154.34° water drop contact angle and 2.41° sliding angle on No. 5 coating were reached, indicating that it was a superhydrophobic surface. The water absorption ratios of the composite coating block were 1.87% and 16.6% at 4 h and 7 days, which were reduced by 97% and 75% in comparison with the original foam concrete. The compressive strength and heat conductivity coefficient after soaking for 4 h of the composite coating block were higher than 4.0 MPa and 0.225 W·m⁻¹·K⁻¹, respectively. The UFA-based superhydrophobic composite coating proposed in this study and applied onto foam concrete is simple and cheap, requires no precise instrument, and can be applied in a large area.

The overuse of chemical fertilizers not only leads to resource wastage but also causes problems such as environmental pollution and soil degradation. In particular, crop growth in saline–sodic soils is severely restricted due to high salinity and alkalinity, further exacerbating challenges in agricultural production. The aim of this study was to investigate different fertilization strategies that combine chemical fertilizer reduction with arbuscular mycorrhizal fungi (AMF) for improving saline–sodic soils and to assess the effects of these protocols on crop yield, soil properties, and microbial communities. Field experiments across two sites (BeiWuLao and XuJiaZhen) demonstrated that integrating AMF with CF reduction (AHCF treatment) significantly enhanced maize yield by 23.5% at BeiWuLao (from 11,475 to 14,175 kg/ha) and 81.2% at XuJiaZhen (from 7245 to 13,125 kg/ha) compared to conventional fertilization (CK) (p < 0.01). Soil nutrient analysis revealed substantial improvements: available potassium (AK) increased by 77.7% (61.35 vs. 39.33 mg/kg), available phosphorus (AP) by 33.9% (20.50 vs. 15.50 mg/kg), ammonium nitrogen (AN) by 57.3% (64.17 vs. 40.83 mg/kg), and soil organic matter (SOM) by 96.4% (46.98 vs. 23.91 mg/kg) under AHCF treatment (p < 0.05). Although pH and electrical conductivity (ECe) remained unaffected, AMF inoculation shifted microbial composition, elevating salinity-tolerant taxa such as Actinobacteria (+24.7%) and Anabaena. Beta diversity analysis (PCoA) confirmed distinct microbial community structures between treatments, with ECe and AN identified as primary drivers of bacterial (RDA variance: 74.08%) and fungal (RDA variance: 54.63%) communities, respectively. Overall, the combination of chemical fertilizer reduction and AMF effectively improved soil fertility, microbial community structure, and crop yield. These findings have important implications for improving saline soils and promoting environmental sustainability.

Cadmium (Cd) drastically inhibits plant growth and metabolism, whereas arbuscular mycorrhizal (AM) fungi can enhance plant Cd tolerance through metabolic regulation. To clarify tissue-specific responses, we conducted a pot experiment combined with GC-MS to examine how AM fungi influence root and leaf metabolism of ryegrass (Lolium perenne L.) under different Cd levels. Root and leaf metabolomes diverged substantially in composition and function. In total, 83 metabolites were identified in roots, mainly phenolics, amines, and sugars associated with carbon–nitrogen metabolism and stress-defense pathways, whereas 75 metabolites were identified in leaves, largely related to photosynthetic metabolism. Roots were more sensitive to Cd, showing significant metabolic alterations at Cd ≥ 5 mg·kg⁻¹, including disruption of galactose metabolism, while leaves exhibited notable changes only at Cd ≥ 100 mg·kg⁻¹, with suppression of citrate, L-aspartate, and starch and sucrose metabolism. AM fungi modulated plant metabolism more strongly under Cd stress. Specifically, AM fungi restored Cd-suppressed galactose and glyoxylate/dicarboxylate metabolism in roots, enhanced starch and sucrose metabolism and amino acid pathways in leaves, and increased stress-related amino acids and organic acids in both tissues. Overall, AM fungi substantially alleviated Cd-induced metabolic inhibition, particularly at Cd ≥ 50 mg·kg⁻¹, providing mechanistic insight into AM-enhanced Cd tolerance and supporting the application of AM symbiosis in remediation of Cd-contaminated soils.

To investigate the regulatory mechanisms of arbuscular mycorrhizal fungi (AMF) on the growth, cadmium (Cd) uptake and translocation of plants with distinct mycorrhizal dependency (MD), a pot experiment was conducted using Paspalum notatum (high MD) and Lolium perenne (low MD) under two Cd gradients (5 mg·kg⁻¹, 50 mg·kg⁻¹) with AMF-inoculated/non-inoculated treatments, with 0 mg·kg⁻¹ set as the control group. AMF significantly enhanced the dry weight and colonization rate of both plant species, and the MD of Paspalum notatum remained consistently higher. The growth-promoting effect of AMF (quantified by MD) exceeded the toxicity induced by Cd stress, thereby mitigating growth inhibition by promoting hyphal growth in the rhizosphere. AMF improved the root bioconcentration factor (BCF) and total Cd extraction capacity of the plants, which was correlated with the plants’ inherent Cd absorption capacity but not with MD. AMF exerted species-specific regulatory effects on the translocation factor (TF): the TF of Paspalum notatum increased after inoculation, while that of Lolium perenne decreased.

Excessive fertilizer use drives soil degradation and resource waste. This study investigates how arbuscular mycorrhizal fungi (AMF) formulations (powder vs. granular) optimize maize (Zea mays L.) yield, soil microbiome, and economic benefits under 50% and 75% fertilizer reduction. Field trials showed that the AMF powder formulation under 50% fertilizer reduction (AP50) increased maize yield by 14.67%. This increase was associated with rapid root colonization (85.3%), enhanced phosphorus availability, and the recruitment of beneficial fungi such as Mortierellomycota. Granular formulation at 75% reduction (AG75) achieved 7.18% yield gain via sustained symbiosis. Fungal communities exhibited greater sensitivity to fertilization than bacteria (Chao1, p = 0.0094), with AMF suppressing Fusarium by 42% while enriching functional taxa (Actinobacteria, Mortierellomycota). Economic analysis confirms that AP50 (30,435 CNY/ha) and AG75 (26,954 CNY/ha) yield higher net profits, where CNY denotes Chinese Yuan. Powder formulations maximize immediate benefits in medium- to low-fertility soils, whereas granules support long-term soil health in high-organic systems, providing a precision strategy for sustainable agriculture.