作　　者： ; ; ; ; ; (吴春华）;

机构地区： 黄河水利委员会

出　　处： 《生态学报》 2005年第6期1325-1330,共6页

摘　　要： 通过盆栽试验研究了13种杂草在模拟铅污染土壤中的菌根形成及对铅的吸收累积特点。结果表明铅污染对杂草的生长没有明显影响。铅污染土壤中杂草的菌根侵染状况发生了显著变化,与无污染的土壤相比,苦荬菜(Ixerischinensis)、早熟禾(Poaannua)、黑麦草(Loliumperenne)、野燕麦(Avenafatua)、野豌豆(Viciacracca)、白车轴草(Trifoliumrepens)的菌根侵染率下降,而无芒稗(Echinochloacrusgallivar.mitis)、北美车前(Plantagovirginica)、鼠曲草(Gnaphaliumaffine)和酢浆草(Oxaliscorniculata)的菌根侵染率上升,鸡眼草(Kummerowiastriata)、升马唐(Digitariaciliaris)和婆婆纳(Veronicadidyma)无明显变化;土壤中的孢子数除了鸡眼草、野豌豆、白车轴草和酢浆草无显著差异外,其余物种在铅污染土壤中的孢子数量与对照相比明显下降。不同的杂草物种对土壤铅的吸收和积累存在明显差异,被杂草吸收的铅主要积累在杂草根系内,向杂草地上部转移的铅比率不高。 Mycorrhizal colonization and lead(Pb) uptake of weed species in a simulated Pb-polluted soil were studied by pot experiments in growth chamber. Thirteen species Kummerowia striata, Digitaria ciliaris, Ixeris chinensis, Echinochloa crusgalli var mitis, Plantago virginica, Trifolium repens, Veronica didyma, Gnaphalium affine, Vicia cracca, Avena fatua, Lolium perenne, Poa annua, Oxalis corniculata from orchard were used in this experiment. Under monoculture, the growth of 13 weeds was not significantly affected when soil Pb concentration was 334.53mg/kg. Height and biomass of plants did not significantly differ from those grown in Pb elevated soil and their controls (p> 0.05). Compared to control, Pb concentration in roots of all species significantly increased under Pb treatment except Amarathus spinosus and Amaranthus paniculatu. However, only 7 species of weeds were found increase in Pb concentration in shoots under Pb treatment. In Pb elevated soil, root Pb concentration in all species except Amaranthus paniculatus, was significantly higher than that of shoot Pb concentration, indicating that Pb was mainly accumulated in roots. Weed species differed significantly in Pb concentration of root among specie, following the order Oxalis corniculata>Lolium perenne>Gnaphalium affine>Vicia cracca>Lolium perenne>Plantago virginica>Poa annua>Kummerowia striata>Veronica didyma>Digitaria ciliaris>Echinochloa crusgalli var mitis>Ixeris chinensis>Trifolium repens. Mycorrhizae were positive, negative or neutral influenced by Pb treatments among 13 species. Compared to the control, mycorrhizal infection rate of Echinochloa crusgalli var mitis, Plantago virginica, Gnaphalium affine, Oxalis cornculata and Eragrostis pilosa was enhanced significantly (p<0.01), Ixeris chinensis, Poa annua, Lolium perenne, Avena fatua, Vicia cracca and Trfolium repens was reduced significantly (p<0.01), and Kummerowia striata, Digitaria ciliaris, Veroncia didyma, Amaranthus paniculatus, Amarathus spinosus, Eleusine indica, soybean and rice was not s

关 键 词： 铅污染 杂草 丛枝菌根真菌

领　　域： [生物学] [生物学]