Acorus calamus Linn.was cultured by root-box method,naphthalene conta mination on rhizosphere and non-rhizosphere soil microbial indicators was analys esed.The results showed that naphthalene contamination might inhibit the growth of bacteria and actinomycetes,root radial oxygen loss and short-term root exud ates could soften the effect of naphthalene contamination,the environment in no n-rhizosphere was more beneficial to the growth of bacteria and actinomycetes th an rhizosphere.Naphthalene contamination ...