Interactive effects of phenolic acid and nitrogen on morphological traits of poplar (Populus × euramericana ‘Neva’) fine roots Effects of Phyllostachys edulis expansion on soil nitrogen mineralization and its availability in evergreen broadleaf forest. Effect of biochar on nitrogen forms and related microorganisms of rhizosphere soil of seedling maize Review of research progress on the influence and mechanism of field straw residue incorporation on soil organic matter and nitrogen availability Advances in in situ Assessment Methods of Forest Soil Nitrogen Availability