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采用土培盆栽试验和室内分析相结合的方法,研究了添加不同含量外源亚硒酸盐对小白菜、芥菜、生菜和菠菜的生长、吸收及转运硒的影响.结果表明,低含量硒(<3.81mg·kg-1)对供试的4种蔬菜的生长均有促进作用,而高含量硒(>29.91mg·kg-1)却显著抑制蔬菜的生长,并对供试蔬菜的茎、根产生明显的毒害作用.同等硒添加量条件下,4种供试蔬菜中以芥菜的地上生物量最大、菠菜最小,以生菜的地下生物量最大.4种蔬菜地上和地下部硒含量均随着外源硒添加量的增大而增大(p<0.01),以小白菜地上部的硒累积量最大,生菜最小;小白菜和芥菜地下部对硒的吸收量大于生菜和菠菜.菠菜将硒从根部转运到地上部的能力最强,生菜最弱.供试的4种蔬菜相较而言,小白菜因生物量较大且富集硒的能力最强,适用作富硒蔬菜或作为硒污染土壤的修复作物,以亚硒酸盐形式补施硒的水平以小于3.81mg·kg-1为宜.
The effects of different concentrations of exogenous selenite on the growth, absorption and translocation of selectivities of Chinese cabbage, mustard, lettuce and spinach were studied by soil culture pot experiment and laboratory analysis.The results showed that low contents of selenium <3.81 mg · kg-1) promoted the growth of the four tested vegetables, while the high content of selenium (> 29.91 mg · kg-1) significantly inhibited the growth of vegetables. Roots had obvious toxic effects.Under the same condition of selenium addition, the aboveground biomass of mustard mustard was the highest among the four tested vegetables, while the spinach was the smallest and the underground biomass of lettuce was the highest.These selenium contents of above and below ground vegetables With the increase of exogenous selenium (p <0.01), the accumulation of selenium in the upper part of the Chinese cabbage is the largest and the lettuce is the smallest, while the absorption of selenium in the lower part of the Chinese cabbage and mustard is greater than that of the lettuce and spinach Selenium transport from the roots to the top of the strongest ability, lettuce weakest the four tested vegetables compared to the cabbage due to biomass and selenium-enriched the strongest capacity for selenium-rich vegetables or as Selenium contaminated soils are repaired with selenium levels less than selenium 3.81mg · kg-1 is appropriate.