Rhizosphere properties in monocropping and intercropping systems between faba bean (Vicia faba L.) and maize (Zea mays L.) grown in a calcareous soil

摘要: The processes involving pH modification, carboxylate exudation and phosphorus (P) dynamics in the rhizosphere of crops grown intercropping are poorly understood. Two groups maize (Zea mays L.) or faba bean (Vicia plants (monocropping) one group plant each species (intercropping) were between three 1-mm-thick soil layers; central layer is referred to as inter-rhizosphere, two outer layers designated sole-rhizosphere. Faba intercropped with had an 11% increase shoot biomass a 15% P uptake compared monocropped bean. cropping pattern did not significantly influence growth. After 4 weeks growth, decreased both sole- inter-rhizosphere monocropping, but no effects apparent for rhizosphere. major carboxylates malate (18–45 nmol g–1 soil) maleate (1.2–2.4 nmol g–1 soil). Only trace amounts measured maize. However, high concentration (~11 nmol g–1 inter-rhizosphere; was likely exuded by then diffused sole-rhizosphere amount 19% higher than plants. results indicate that diffusion protons extended interaction zone bean, may have contributed enhancements system.