title: [Regulation effects of arbuscular mycorrhizal fungi on the interactions between barnyard grass and upland rice under enhanced nitrogen supply].
abstract: A pot experiment was conducted to study the regulation effects of arbuscular mycorrhizal fungi (AMF) on the interactions between Echinochloa crus-galli var. mitis L. and Oryza sativa L. under enhanced N supply (4.0 g N x m(-2) x a(-1)). The results showed that under monoculture condition, the AMF colonization on E. crus-galli increased but that on O. sativa decreased. In the treatments with and without AMF inoculation, upland rice biomass and its P and N uptake increased by 42.35% and 13.48%, 4.07% and 2.55%, and 30.35% and 62.09%, respectively, and barnyard grass biomass and its P and N uptake increased by 20.24% and 15.65%, 3.88% and 4.06%, and 15.10% and 30.35%, respectively. Under mixed cropping, the AMF colonization on E. crus-galli increased but that on O. sativa had little change. In the treatments with and without AMF inoculation, the biomass ratio of O. sativa to E. crus-galli decreased, but N uptake ratio changed a little. The P uptake ratio of O. sativa to E. crus-galli increased in treatment without AMF inoculation but decreased in treatment with AMF inoculation. It was suggested that AMF tended to enhance the competition of E. crus-galli to O. sativa under enhanced N supply.
authors.affiliation: Department of Biology, Lishui College, Lishui 323000, Zhejiang, China. aests@sina.com
authors.forename: Sheng-Chao
authors.initials: SC
authors.lastname: Zhu
authors.forename: Shan-Shan
authors.initials: SS
authors.lastname: Zhang
authors.forename: Jian-Jun
authors.initials: JJ
authors.lastname: Tang
authors.forename: Qi-Qing
authors.initials: QQ
authors.lastname: Jiang
authors.forename: Xin
authors.initials: X
authors.lastname: Chen
mesh_terms: D018533:Biomass; D031747:Echinochloa / Q000254:growth & development* / Q000378:metabolism / Q000382:microbiology; D017753:Ecosystem; D038821:Mycorrhizae / Q000187:drug effects / Q000502:physiology*; D009584:Nitrogen / Q000378:metabolism / Q000494:pharmacology*; D012275:Oryza / Q000254:growth & development* / Q000378:metabolism / Q000382:microbiology; D018517:Plant Roots / Q000254:growth & development / Q000378:metabolism / Q000382:microbiology
chemical_list: D009584:Nitrogen