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To further improve the fire extinguishing efficiency of environmentally friendly foam extinguishing agents，surfactants of the sodium alpha-olefin sulfonate (AOS) and phosphate betaine silicone surfactant (PBSS) and foam stabilizers of inorganic salts and polysaccharides were used to propose environmentally friendly foam extinguishing agents. The effects of inorganic salt and polysaccharide mixtures on surface tension，foaming capability，and foam stability were analyzed. Then the foam stabilization mechanism of the foam stabilizer mixtures was investigated. The results indicated that the inorganic salt and polysaccharide mixtures greatly improved the physicochemical properties of the foam extinguishing agents. The foam fire extinguishing agent mixture by 0.025% xanthan gum，0.125% gelatin，and 0.1% MgCl2 showed the best overall performance with a surface tension of 24.34 mN/m，an initial foam height of 118.81 mm，and a 25% liquid drainage time of 132.1 s. The foam stabilizing mechanism of the foam stabilizer was attributed to the formation of hydrogen bonds between xanthan gum and gelatin，which greatly enhanced the surface strength of the foam liquid film，thereby effectively slowing down the drainage rate and bubbles coarsening of foam. Moreover，the Mg2+ was adsorbed around the AOS/PBSS head group due to electrostatic interaction，which impaired the electrostatic repulsion between the head groups and increased the concentration of surfactant，further improving foam stability.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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