title: [Effects of dissolved organic matter on copper absorption by ryegrass].
abstract: In this study, dissolved organic matter (DOM) was extracted from earthworm casts and from the cattle manure with which the earthworms were fed, and a water culture experiment was conducted to study the effects of the DOM on the copper (Cu2+) absorption by ryegrass in the presence of different concentration Cu2+ (0, 5 and 10 mg x L(-1)). With the increasing concentration of Cu2+ in the medium, there was a gradual decrease in the dry mass of ryegrass shoots and roots and in the root length, surface area, volume, and tip number. In the presence of medium Cu2+, DOM increased the biomass of shoots and roots and the root length, surface area, volume, and tip number significantly. DOM reduced the Cu2+ concentration in roots, promoted the Cu2+ translocation from roots to shoots, and significantly increased the Cu2+ accumulation in shoots. The DOM from earthworm casts had better effects than that from cattle manure, and high concentration DOM had better effects than low concentration DOM.
authors.affiliation: College of Resources and Environmental Science, Nanjing Agricultural University, Nanjing 210095, China. ctang@iue.ac.cn
authors.forename: Chao
authors.initials: C
authors.lastname: Tang
authors.forename: Bin
authors.initials: B
authors.lastname: Wang
authors.forename: Man-Qiang
authors.initials: MQ
authors.lastname: Liu
authors.forename: Feng
authors.initials: F
authors.lastname: Hu
authors.forename: Hui-Xin
authors.initials: HX
authors.lastname: Li
authors.forename: Jia-Guo
authors.initials: JG
authors.lastname: Jiao
mesh_terms: D000818:Animals; D001673:Biodegradation, Environmental; D002681:China; D003300:Copper / Q000302:isolation & purification* / Q000378:metabolism; D008129:Lolium / Q000378:metabolism* / Q000502:physiology; D009835:Oligochaeta / Q000737:chemistry; D009930:Organic Chemicals / Q000302:isolation & purification / Q000494:pharmacology*; D012989:Soil Pollutants / Q000302:isolation & purification* / Q000378:metabolism; D012995:Solubility
chemical_list: D009930:Organic Chemicals; D012989:Soil Pollutants; D003300:Copper