关键词: 锶, 水培, 营养元素, 富集, 迁移

Abstract: OBJECTIVE:To study the accumulation and migration of strontium by Epipremnum aureum,Chlorophytum comosum (Thunb.) Baker. and Tradescantia zebrine Bosse.,and the effect of strontium exposure on absorption of other six main nutrients. METHODS:Three kinds of plants were maintained by hydroponic culture. Each kind was treated as control and 3 treatment groups with strontium concentrations of 1,2 and 3 mmol/L,respectively. Each treatment was experimentally cultured with 4 plants of Epipremnum aureum and Tradescantia zebrine,and 3 plants of Chlorophytum comosum. The entire experiment was carried out in the light incubator,and the experimental conditions of each treatment were consistent. The lasted 28 d. The contents of calcium,iron,potassium,magnesium,phosphorus,sulfur and strontium in plant tissues were determined by ICP-AES. RESULTS:The content of strontium in three kinds of plant tissues treated with 3 mmol/L strontium was significantly different from that of control (P < 0.05). Strontium concentrations among the plant tissues were Tradescantia zebrine leaves > Epipremnum aureum leaves > Chlorophytum comosum leaves,Tradescantia zebrine stems > Epipremnum aureum stems,Tradescantia zebrine roots > Chlorophytum comosum roots. With the increase of strontium,the contents of calcium and iron in plant tissues were decreased significantly (P < 0.05). In this experiment,the transportation factor (TF) of Tradescantia zebrine leaves,stems and Chlorophytum comosum leaves were between 0.36 and 2.54. The TF of Tradescantia zebrine leaves and stems were the highest under 1 mmol/L strontium treatment,reaching 2.54 and 2.33,respectively. With the increase of strontium concentration in hydroponic solution,the TF showed a downward trend. CONCLUSION:Compared with the 3 experimental plants,Tradescantia zebrine can be used as an alternative plant for strontium phytoremediation in contaminated water. The increase of strontium content can reduce the absorption and accumulation of calcium and iron in plants.

Key words: strontium, hydroponic culture, nutrient elements, accumulation, migration