Root-mycorrhizae interactions contributed to organic carbon density in the sandy soil profiles of adapted grazing lands

摘要: Abstract Grazing lands occupy a substantial area around the world and could serve as carbon sink if soil organic sequestration potential is increased. In subtropical climates, grazing are more commonly situated on low productive sandy profiles with poor attributes for sequestration. Soil acidity limits root beneficial microbial interactions, both critical increasing (SOC) Adapted forage (vegetation) management help to improve root-microbe interactions SOC stocks in profile. The objective of this study was quantify density profile along aboveground belowground biomass pools, influenced by long-term cattle different systems managed or without inorganic nitrogen (iN) fertilization. following treatments were implemented continuously last 30 years. Warm season perennial grass (C4, Cynodon dactylon) pastures either over-sown C3 ryegrass (Lolium multiforum; C4-C3G) clover (Trifolium sp.; C4-C3L), order extend into cool months. Grass-based (C4-C3G) fertilized, called treatment (iN), while (C4-C3L N) did not receive iN fertilization (oN). two further split compare high pressure (HG LG). Forage, estimated from cores sampled separately during C4 seasons. Results indicated that (Mg ha−1) at level (0–60 cm) higher under compared high, fertilized oN treatments. However, subsoil (20–60 cm) significantly Forage HG treatments, but arbuscular mycorrhizae (AM) decreased. There no consistent trends other pools response GP N It can be concluded surface largely due differences biomass, plant productivity. Among AM most responsive experimental factors their interaction effects, thus reliable metric optimize achieve stewardship goals.