Alsharmani Ahmed R, Solaiman Zakaria M, Leopold Matthias, Abbott Lynette K, Mickan Bede S
School of Agriculture and Environment, and UWA Institute of Agriculture, The University of Western Australia, Perth, WA 6009, Australia.
College of Science, University of Kufa, Najaf 54001, Iraq.
Microorganisms. 2023 Apr 17;11(4):1051. doi: 10.3390/microorganisms11041051.
Intensive fertilizer use can constrain contributions from soil biological processes in pastures, including those associated with arbuscular mycorrhizal (AM) fungi. We evaluated the effect of fertilizers of different P solubility on the colonization of the roots of two common pasture plants by a community of AM fungi in a pasture soil. The treatments were a rock mineral fertilizer, a chemical fertilizer and a microbial inoculant. Subterranean clover and annual ryegrass were grown in pots for 10 weeks. Both fertilizers reduced the proportion and length of roots colonized by naturally occurring AM fungi. However, by 10 weeks, there was a much greater length of mycorrhizal root for annual ryegrass than for subterranean clover. The relative abundance of mycorrhizal fungi in the families Glomeraceae and Acaulosporaceae in roots was not affected by the form of fertilizer, but diversity indices of AM fungi in roots were altered. The chemical fertilizer had a greater negative effect on AM fungal diversity indices in the annual ryegrass roots compared with the subterranean clover roots. The reduction in OTU richness of AM fungi with fertilizer application corresponded with reduced soil pH. Differential effects of P fertilizers on naturally occurring AM fungi in this agricultural soil have the potential to influence the efficacy of P fertilizer use and dominance of plant species in grasslands.
大量使用化肥会抑制牧场土壤生物过程的贡献，包括与丛枝菌根（AM）真菌相关的过程。我们评估了不同磷溶解度的肥料对牧场土壤中AM真菌群落定殖于两种常见牧场植物根系的影响。处理方式包括一种岩石矿物肥料、一种化学肥料和一种微生物接种剂。将地下三叶草和一年生黑麦草种植在花盆中10周。两种肥料都降低了自然存在的AM真菌定殖的根系比例和长度。然而，到10周时，一年生黑麦草的菌根根长度比地下三叶草长得多。根系中球囊霉科和无梗囊霉科菌根真菌的相对丰度不受肥料形式的影响，但根系中AM真菌的多样性指数发生了改变。与地下三叶草根系相比，化学肥料对一年生黑麦草根系中AM真菌多样性指数的负面影响更大。施用肥料导致AM真菌OTU丰富度降低与土壤pH值降低相对应。磷肥对这种农业土壤中自然存在的AM真菌的不同影响有可能影响磷肥的使用效率和草原植物物种的优势地位。
