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通过盆栽试验和室内分析,研究了小白菜对不同含量的外源硒酸盐和亚硒酸盐动态吸收的差异,并通过土壤有效硒及生物量的动态变化探究其产生的原因,旨在为富硒作物的生产和硒污染土壤的植物修复提供理论依据.结果表明,硒酸盐和亚硒酸盐处理小白菜地上部分生物量间无显著差异.在小白菜的整个生长期间(8周),硒酸盐处理小白菜地上、地下部硒含量均随生长逐渐下降,而亚硒酸盐处理小白菜地上、地下部硒含量均随生长逐渐增大.硒酸盐处理地上部硒吸收量显著高于地下部,而亚硒酸盐处理地下部硒吸收量显著高于地上部;且在整个生长过程中硒酸盐处理小白菜硒吸收量是亚硒酸盐处理的2～60倍之多,导致硒酸盐处理土壤中有效硒含量随着小白菜的生长迅速下降,而亚硒酸盐处理土壤中有效硒含量随小白菜的生长略有下降.统计分析表明,硒酸盐处理小白菜体内硒含量与土壤有效硒含量呈显著正相关,地上、地下硒含量与土壤有效硒的相关系数分别为0.901和0.864,而亚硒酸盐处理两者相关性不显著.综合小白菜硒含量和土壤有效硒随生长变化的结果可以得出,小白菜对硒酸盐和亚硒酸盐动态吸收的差异是小白菜对不同价态硒吸收能力和土壤供硒能力综合作用的结果.
Through pot experiment and laboratory analysis, the differences of dynamic absorption of exogenous selenite and selenite in different contents of cabbage were studied, and the reason of its occurrence was explored through the dynamic changes of soil available selenium and biomass. The results showed that there was no significant difference in the above-ground biomass of the Chinese cabbage treated with selenate and selenite during the whole growth period of cabbage (8 weeks) Selenium content in both ground and underground selenate decreased gradually with the growth, while selenium content in both ground and underground selenite increased with selenate growth.Selenium uptake in selenite was significant Was higher than that in the subsurface, and the selenium uptake in the subsurface selenite was significantly higher than that in the aerial part. Selenium uptake by selenate-treated Chinese cabbage was 2 ~ 60 times higher than that in the selenite treatment , The available selenium content in selenate-treated soil decreased rapidly with the growth of pakchoi, while the effective selenium content in selenite-treated soil decreased slightly with the growth of pakchoi.Statistical analysis showed that selenate treatment of pakchoi There was a significant positive correlation between selenium content and soil available selenium content, the correlation coefficient between above and below selenium content and soil available selenium was 0.901 and 0.864, respectively, while selenite treatment was not significant.Combined selenium content and Soil available selenium with the growth of the results can be drawn, Chinese cabbage on the dynamic absorption of selenite and selenite differences in cabbage on the different valences of selenium absorption capacity and the results of the combined effect of selenium in the soil.