Despite their importance, there is a lack of knowledge on the impact of forming arbuscular mycorrhizas (AM) on soil phosphorus (P) leaching in soils with different textures. Therefore, the objective of this study was to investigate the impacts of mycorrhizal and non-mycorrhizal roots on P leaching in two non-sterilised soils of contrasting texture. A mycorrhiza-defective tomato (Solanum lycopersicum L.) genotype (named rmc), and its wild-type progenitor that is able to form AM (named 76R), were used to investigate the effects of AM on soil P loss via leaching. Concentrations of reactive and un-reactive P in the leachate and soil were measured and related to plant growth, plant P uptake, soil water relations and leachate dissolved organic carbon (DOC) concentration. Soil texture affected mycorrhizal colonization, plant growth and plant P concentration, and influenced the concentration and chemical composition of P and the concentration of DOC leached. The chemical composition of P leached and P remaining in soil varied with soil texture, the presence or absence of roots, and their arbuscular mycorrhizal status. Mycorrhizal plants reduced P lost via leaching in the sandy soil substrate, where DOC leached was also high. The roots, regardless of mycorrhizal colonization, appeared to have the greatest impact on increasing P and DOC leached. Taken together, this study provides new insights into the role of AM on soil P loss via leaching in soils of contrasting texture.

尽管它们很重要，但对于形成丛枝菌根 (AM) 对不同质地土壤中土壤磷 (P) 浸出的影响仍缺乏了解。因此，本研究的目的是研究菌根和非菌根根对两种质地不同的未消毒土壤中磷浸出的影响。一种菌根缺陷番茄（Solanum lycopersicum L.）基因型（命名为rmc)，及其能够形成 AM 的野生型祖细胞（命名为 76R），被用来研究 AM 通过浸出对土壤 P 损失的影响。测量渗滤液和土壤中活性和非活性磷的浓度，并与植物生长、植物磷吸收、土壤水分关系和渗滤液溶解有机碳 (DOC) 浓度相关。土壤质地影响菌根定植、植物生长和植物磷浓度，并影响磷的浓度和化学成分以及浸出的DOC浓度。土壤中浸出的磷和残留在土壤中的磷的化学成分随土壤质地、根的存在与否以及它们的丛枝菌根状态而变化。菌根植物通过在沙质土壤基质中的浸出减少了 P 损失，其中 DOC 浸出量也很高。根，无论菌根定植如何，似乎对增加 P 和 DOC 浸出的影响最大。总而言之，这项研究为 AM 通过在不同质地的土壤中浸出对土壤 P 损失的作用提供了新的见解。