15N natural abundance AM fungi Casuarina Pseudomonas Research & information: general abiotic stress bacteria biodiversity biofumigant biological nitrogen fixation biotic stress community weighted means core microbiome cover crops diversity endophytes functional diversity functional traits grapevine trunk disease herbaceous vegetation hydraulic roughness land use intensity leaf and stem functional traits nitrogen concentration nitrogen transfer plant plant-associated microbiome plant-microbe interactions plant-runoff interaction rehabilitation