題      目：Cascading Effects Within Soil Food Web Amplify Fungal Biomass and Necromass Production

譯      名：土壤食物網(wǎng)中的級聯(lián)效應對微生物生物量和殘體的影響

期      刊：Global Change Biology

發(fā)表時間：2025.05.19

第一作者：張士秀 副研究員

通訊作者：梁愛珍 研究員

題      目：Cascading Effects Within Soil Food Web Amplify Fungal Biomass and Necromass Production

譯      名：土壤食物網(wǎng)中的級聯(lián)效應對微生物生物量和殘體的影響

期      刊：Global Change Biology

發(fā)表時間：2025.05.19

第一作者：張士秀 副研究員

通訊作者：梁愛珍 研究員

基礎信息  

題      目：Cascading Effects Within Soil Food Web Amplify Fungal Biomass and Necromass Production

譯      名：土壤食物網(wǎng)中的級聯(lián)效應對微生物生物量和殘體的影響

期      刊：Global Change Biology

發(fā)表時間：2025.05.19

第一作者：張士秀 副研究員

通訊作者：梁愛珍 研究員

第一單位：中國科學院東北地理與農(nóng)業(yè)生態(tài)研究所

Fig. 3.Microbial necromass patterns and their associations with soil food web components. (A, B) Variation in microbial necromass observed from both the long-term field experiment and the ¹³C in situ tracing experiment. (C) Pearson correlation heatmap showing the relationships of fungal-to-bacterial necromass ratio with nematode and microbial groups across tillage practices in both the long-term field and ¹³C in situ tracing experiments. (D) Relative importance of nematode and microbial groups contributing to the variation in fungal and bacterial necromass under tillage practices (till vs. no-till) in the ¹³C in situ tracing experiment. Importance is expressed as the percentage increase in mean square error (MSE) from the random forest analysis. Necro.Fu:Ba, Fungal-to-bacterial necromass ratio; Necro.Fu, Fungal necromass; Necro.Ba, Bacterial necromass; OP, Omnivores-predators; FV, Fungivores; BV, Bacterivores; PP, Plant-parasites; Fu, Fungi; Act, Actinomycetes; GBa, General bacteria.

Fig. 4.Feeding strategy of omnivores-predators depending on tillage practices. (A, B) ¹³C signature-based analyses of food source traceability for omnivores-predators under tillage and no-tillage practices. (C) Comparison of feeding proportions of omnivores-predators between tillage and no-tillage practices. FV: Fungivores; BV: Bacterivores; PP: Plant-parasites; Fu: Fungi; Act: Actinomycetes; GBa: General bacteria.

Fig. 5.Top-down analyses along the food chain depending on tillage practices (till: Tillage, no-till: No-tillage). (A) Relationships among omnivores-predators, fungivores, and fungi. (B) Relationships between microbial groups and the ratio of 13C-fungal to 13C-bacterial necromass (Necro.Fu-13C:Ba-13C). Black dashed lines indicate overall model fits; tangerine and turquoise lines indicate trends under tillage and no-tillage, respectively.

Fig. 6.Associations of omnivores-predators with microbivores and their impacts on microbial necromass depending on tillage practices. (A) Best-fit models depicting the dynamics of 13C content (ng g−1 dry soil) in omnivores-predators, bacterivores and fungivores under tillage and no-tillage practices throughout the tracing period. (B) Structural equation modeling (SEM) showing top-down control pathways of fungal-to-bacterial necromass ratio by omnivores-predators. Black arrows indicate positive correlations, red arrows negative correlations. The numbers on the arrows are pathway coefficients, and the width of the arrows indicates the strength of the pathway coefficients.

Fig. 7.A framework illustrating interactions of bottom-up and top-down forces driving the impact of omnivores-predators on fungi-fungal necromass dynamics depending on tillage practices. Black arrows represent resource-driven, bottom-up energy flow pathways, with arrow thickness indicating flow intensity. Blue arrows represent predator-induced, top-down regulation from higher to lower trophic levels, with “−” or “+” indicating reduction or increase of lower trophic groups. Red dashed arrows represent trophic cascading effects, with “+” indicating amplification.

綜上所述，這些微小但普遍存在的雜食性捕食性線蟲通過增強*生物量和活性，對腐殖質(zhì)形成產(chǎn)生了不成比例的影響。鑒于土壤食物網(wǎng)的內(nèi)在復雜性和本研究的觀測性質(zhì)，針對多營養(yǎng)級相互作用的進一步操縱實驗對于揭示微生物腐殖質(zhì)形成機制至關重要。

 原文鏈接：

https://onlinelibrary.wiley.com/doi/10.1111/gcb.70235