Global food wastage equates to about 1.3 billion tons per year, which causes serious environmental impacts. The objective of this study was to evaluate the influences of addition of digestate from food waste in comparison to a synthetic liquid urea ammonium nitrate solution on plant growth, rhizosphere bacterial community composition and diversity, and hyphal abundance of arbuscular mycorrhizal (AM) fungi. Plant and soil samples were collected at 25, 50, and 75 days after seedling emergence. Annual ryegrass growth was significantly increased by both liquid urea ammonium nitrate and digestate, and digestate was just as effective as liquid urea ammonium nitrate. Additionally, digestate (50 kg N ha −1 ) significantly increased AM fungal hyphae density. Liquid urea ammonium nitrate (50 kg N ha −1 ) significantly decreased AM fungal hyphae density compared with liquid urea ammonium nitrate (25 kg N ha −1 ) at DAE 75. Digestate and liquid urea ammonium nitrate applications significantly shifted the bacterial community composition and OTU richness and changed the abundance of microbial C and N-cycling genes, while application rates had no significant effect. Structural equation modeling showed that digestate and UAN addition both directly and indirectly affected bacterial, C and N cycling genes community composition; the indirect effects were related to increased soil NO 3 − content and reduced pH. This study showed that the use of digestate as a soil amendment can be environmentally effective and can provide a sustainable supply of nutrients that increases soil organic C. Moreover, the use of digestate can readily be incorporated into agricultural practices with potentially less impact on soil microflora diversity and function than conventional fertilizers.

中文翻译：

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从食物垃圾厌氧消化中回收营养：消化物对植物生长和根际细菌群落组成的影响以及黑麦草的潜在功能

全球食物浪费相当于每年约 13 亿吨，这会对环境造成严重影响。本研究的目的是评估添加食物垃圾消化物与合成液体尿素硝酸铵溶液相比对植物生长、根际细菌群落组成和多样性以及丛枝菌根 (AM) 真菌菌丝丰度的影响。在出苗后 25、50 和 75 天收集植物和土壤样品。液态尿素硝酸铵和消化液都显着增加了黑麦草的年生长量，而且消化液与液态尿素硝酸铵一样有效。此外，消化物（50 kg N ha -1 ）显着增加了 AM 真菌菌丝密度。在 DAE 75 时，液体尿素硝酸铵（50 kg N ha -1 ）与液体尿素硝酸铵（25 kg N ha -1 ）相比显着降低了 AM 真菌菌丝密度。消化液和液体尿素硝酸铵应用显着改变了细菌群落组成和OTU 丰富度和改变微生物 C 和 N 循环基因的丰度，而施用率没有显着影响。结构方程模型表明，消化物和 UAN 添加直接和间接影响细菌、C 和 N 循环基因群落组成；间接影响与土壤 NO 3 - 含量增加和 pH 值降低有关。这项研究表明，使用沼渣作为土壤改良剂可以对环境有效，并且可以提供可持续的养分供应，从而增加土壤有机碳。此外，