Biochar (BC) production from agroforestry wastes and mycorrhizal fungi are potentially important agricultural practices for improving crops yields and increasing phosphorus (P) in volcanic soils. This study aimed to test the effect of BC application on wheat biomass and grain yield production, indigenous arbuscular mycorrhizal (AM) fungi propagules and soil microbial community and related to soil quality properties of an Andisol in Southern Chile. Biochars (BCs) were produced from oat hulls (OBC) and pine bark (PBC). Doses of 0, 5, 10, and 20 Mg ha⁻¹ of BCs were applied on soil using wheat as the test crop. Wheat biomass (root and shoot portion) and grain yield, AM root colonization, spore, mycelium density, and glomalin content (glomalin related soil protein, EE-GRSP) were measured and related with soil quality properties such as bulk density, water-stable aggregates (WSA), and water holding capacity (WHC).

The OBC had a significantly higher macronutrients content (N, P, K) than PBC. The highest dose of both BCs significantly improved shoot and root biomass and wheat grain yield. Application of 20 Mg ha⁻¹ of OBC and PBC increased AM spore density and root colonization relative to control treatment. In the same way, the BC application significantly affects the AM mycelium density. The results showed that the application of higher BC dose changed the soil microbial community. The use of BCs in this volcanic soil is an effective strategy to increase wheat biomass, increase grain yield production, stimulate the indigenous AM fungi activity, enhance soil quality properties, and increase the sustainability levels of agricultural systems.

从农林业废物和菌根真菌生产生物炭 (BC) 是提高作物产量和增加火山土壤中磷 (P) 的潜在重要农业实践。本研究旨在测试 BC 施用对小麦生物量和谷物产量、本地丛枝菌根 (AM) 真菌繁殖体和土壤微生物群落的影响，以及与智利南部安迪索土壤质量特性相关的影响。生物炭 (BC) 由燕麦壳 (OBC) 和松树皮 (PBC) 制成。0、5、10 和 20 Mg ha ^{-1 的}剂量BCs 以小麦作为试验作物施用于土壤。测量了小麦生物量（根和芽部分）和谷物产量、AM 根定植、孢子、菌丝体密度和球藻蛋白含量（球藻蛋白相关土壤蛋白质，EE-GRSP）并与土壤质量特性相关，例如容重、水稳定性骨料 (WSA) 和持水能力 (WHC)。

OBC 的常量营养素含量（N、P、K）明显高于 PBC。两种 BC 的最高剂量显着提高了地上部和根系生物量以及小麦籽粒产量。相对于对照处理，施用20 Mg ha ^-1的OBC 和PBC 增加了AM 孢子密度和根系定植。同样，BC 应用显着影响 AM 菌丝密度。结果表明，施用较高的BC剂量改变了土壤微生物群落。在这种火山土壤中使用 BC 是增加小麦生物量、增加谷物产量、刺激本地 AM 真菌活动、提高土壤质量特性和提高农业系统可持续性水平的有效策略。