A novel method to improve the soil erosion resistance with fungi
A novel method to improve the soil erosion resistance with fungi
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DOI：
10.1007/s11440-022-01673-8
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发表时间：
2022-11
期刊：
影响因子：
5.7
通讯作者：
Xijin Zhang;Xudong Fan;Chen Wang;X. Yu
中科院分区：
文献类型：
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作者：
Xijin Zhang;Xudong Fan;Chen Wang;X. Yu
本研究探讨了一种利用真菌提高土壤抗侵蚀能力的创新方法。一种可食用的丝状真菌平菇（Pleurotus ostreatus）被纳入研究。结果表明：接种于土壤顶面15 d，接种于土壤表面下5 mm处20 d，平菇能生长并完全覆盖60.20 mm直径的圆形表面。采用简化抗冲性试验（SSRT）对真菌介导的土壤样品进行了抗冲性评价。结果表明，真菌介导的砂样在提高临界流速和减小侵蚀速率-流速曲线斜率方面均表现出比对照砂样更高的抗侵蚀能力。探讨了提高耐蚀性的机理。扫描电镜（SEM）分析表明，砂粒被真菌纤维缠绕。在沙地表面观察到真菌菌丝附着的化学沉淀物，通过红外光谱和x射线衍射分析鉴定为方解石、一水草酸钙和二水草酸钙。菌丝体表面表现出疏水行为，平均接触角为116.42°。疏水性产生沿界面滑动。计算流体力学（CFD）模型分析表明，真菌的疏水性导致的滑移降低了水-土界面处的剪切应力，从而提高了真菌介质砂的抗侵蚀能力。
This study evaluated an innovative method to improve soil erosion resistance by fungi. An edible filamentous fungus,Pleurotus ostreatus, was included in the study. The result showed thatPleurotus ostreatusis able to grow and completely cover the circular surface of 60.20 mm diameter in 15 days when inoculated on the top surface and in 20 days when inoculated 5 mm under the soil surface. The erosion resistance of fungi mediated soil samples was evaluated by a Simplified Scour Resistance Test (SSRT). The results showed that fungi-mediated sand samples demonstrated much higher erosion resistance compared with control sand sample, both in terms of increasing the critical flow velocity and reducing the slope of erosion rate versus flow velocity curve. The mechanism of improved erosion resistance was investigated. The microstructure measured by SEM test showed that the sand particles were entangled by fungal fibers. Chemical precipitations were observed on sand surface and attached to fungal hyphae, which were identified as calcite, calcium oxalate monohydrate and calcium oxalate dihydrate by FTIR spectra and XRD analysis. The fungi mycelium surface showed hydrophobic behaviors with an average measured contact angle of 116.42°. The hydrophobicity generated slip along the interface. Analyses with computational fluid dynamics (CFD) model indicated that the slip due to the hydrophobicity of fungi reduced the shear stress at the water-soil interface, which also improved the erosion resistance by fungi-mediated sand.