Abstract Endophytic fungus-tall fescue symbiosis can improve the rhizosphere physical quality, but contribution of oxygen-limited conditions on this change, particularly in semiarid and arid regions has not been established yet. Therefore, the objective of this study was to evaluate the effects of endophyte-tall fescue symbiosis on the rhizosphere quality indicators under different aeration conditions in a greenhouse pot experiment. The treatments were seven levels of air-filled porosity, AFP (0, 0.025, 0.050, 0.750, 0.100, 0.125 and 0.150 m3 m−3) in a sandy loam soil, and two genotypes (75C and 75B) of tall fescue (Festuca arundinacea = Schedonorus arundinaceus Schreb.) each with endophytic fungus Epichloe coenophiala (E+) and without endophyte (E−). Soil biophysical properties were determined on the intact soil aggregates from rhizosphere zone: structural stability (by HEMC, high energy moisture characteristic), percent of water-stable aggregates, water repellency, basal soil respiration and soil organic matter. The results showed that by decreasing the AFP, and reducing redox potential to

中文翻译：

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缺氧条件下Epichloë内生菌-高羊茅共生对根际聚集体稳定性和质量指标的影响

摘要 内生真菌-高羊茅共生可以改善根际物理质量，但限氧条件对这种变化的贡献尚未确定，尤其是在半干旱和干旱地区。因此，本研究的目的是在温室盆栽试验中评估不同通风条件下内生菌-高羊茅共生对根际质量指标的影响。处理是沙壤土中的 7 个充气孔隙度水平、AFP（0、0.025、0.050、0.750、0.100、0.125 和 0.150 m3 m-3）和两种基因型（75C 和 75B） arundinacea = Schedonorus arundinaceus Schreb.)，每个都带有内生真菌 Epichloe coenophiala (E+) 和没有内生菌 (E-)。对来自根际区的完整土壤团聚体测定土壤生物物理特性：结构稳定性（通过 HEMC，高能水分特性）、水稳定团聚体的百分比、防水性、基础土壤呼吸和土壤有机质。结果表明，通过降低 AFP 和降低氧化还原电位，