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孟加拉东南部土壤中的砷含量很高,不仅威胁人的健康,而且对土壤也有破坏作用。云南石梓(Gmelina arborea)在孟加拉是个快速生长的树种,也是含砷土壤中的潜力树种。研究评价了含砷试验土中丛枝菌根真菌对云南石梓(Gmelina arborea)生长的影响。播种前,四种不同浓度的砷(10mg·kg-1、25mg·kg-1、50mg·kg-1和100mg·kg-1)被加入到试验土中。记录生长参数,如,植物的根、苗鲜重、干重、冠幅径、根长和苗高、根瘤菌和孢子菌群落。菌根植株较非菌根植株生长好。与其它含砷量高的土壤中植株的生长情况相比,在含砷量为10-mg·kg-1的土壤中,菌根植株和菌根生长效果最佳,菌根植株生物量最高。随着砷浓度的增加,种苗生长,根瘤菌和孢子菌群落均明显降低p<0.05)。与非菌根植株比较,菌根植株高生长增加了40%,生物量增加了2.4倍。研究表明,根瘤菌接种可以减少有害土壤中的云南石梓(Gmelina arborea)的初生长的影响。
The arsenic content of soils in south-eastern Bangladesh is high, not only threatening human health but also destroying the soil. Gmelina arborea is a rapidly growing species in Bangladesh and is also a potential tree species in arsenic containing soils. The study evaluated the effects of arbuscular mycorrhizal fungi on the growth of Gypnum arborea. Four different concentrations of arsenic (10 mg · kg -1, 25 mg · kg -1, 50 mg · kg -1 and 100 mg · kg -1) were added to the test soil before sowing. Growth parameters were recorded, for example, plant roots, shoot fresh weight, dry weight, crown width, root length and seedling height, rhizobia and sporulation communities. Mycorrhizal plants grow better than non-mycorrhizal plants. Compared with the growth of other plants in soil containing arsenic, the growth of mycorrhizal plants and mycorrhizae was best and the biomass of mycorrhizal plants was the highest in the arsenic soil with 10-mg · kg-1 arsenic. With the increase of arsenic concentration, seedling growth, Rhizobium and spore communities were significantly reduced p <0.05). Compared with non-mycorrhizal plants, mycorrhizal plants grew by 40% and their biomass increased by 2.4 times. Studies have shown that Rhizobium inoculation can reduce the initial growth of Gmelina arborea in harmful soils.