Screening Of Hyperaccumulators And Tolerance Research In Baiyinuoer Lead-zinc Mine

The study took the dominant herbaceous plant species from the Baiyinuoer lead-zinc mine of Chifeng county in Inner Mongolia as objects and the hyperaccumulators of lead were selected. Furthermore, using Artemisia sacrorum Ledeb. var. Messerschmidtiana as study material, its accumulation characteristics and physiological mechanisms were studied in this paper. The major results were summarized as follows:1. The result showed that Artemisia sacrorum Ledeb. var. Messerschmidtiana (Bess.) Y.R.Ling.and Artemisia sacrorum Ledeb.were accumulators of lead (Pb) by the field survey and measurement of different herbages. In the natural condition, the Pb concentrations of Artemisia sacrorum Ledeb. var. Messerschmidtiana (Bess.) Y.R.Ling. and Artemisia sacrorum Ledeb.were 2264.47 mg/kg and 1511.96mg/kg,enrichment factors were 1.246 and 0.705, respectively;Pb transportation coefficients were 9.22 and 3.73.2. Under the different Pb concentrations, the highest Pb concentration in shoot and root of Artemisia sacrorum Ledeb. var. Messerschmidtiana (Bess.) Y.R.Ling.were 2637.16 mg/kg,253.96mg/kg. The highest Pb enrichment factor was 1.35 in the plant, while the highest Pb translocation coefficient was 10.38. Thus, Artemisia sacrorum Ledeb. var. Messerschmidtiana (Bess.) Y.R.Ling. was thought as a new Pb hyperaccumulator.3. According to the experiment of Pb tolerance between mining ecotype and non- mining ecotype of Artemisia sacrorum Ledeb. var. Messerschmidtiana, in the treatment scope, the mining ecotype could grow in soils supplied with 2313.35 mg/kg,while the growth of non- mining ecotype was restrained at Pb≥81.2mg/kg. The lead content of shoot about mining ecotype increased with the rise of soil lead content. In 200 mg/kg treatment level, the ministry mining ecotype total lead content and accumulation of non-mining ecotype was 26.7 times. This shows that the potential repairing of lead-contaminated of mining ecotype is higher than non- mining ecotype.4. The anatomical structure of mining ecotype of Artemisia sacrorum Ledeb. var. Messerschmidtiana had no obvious difference compared with contrast. But the non-mining ecotype showed serious symptoms of lead poisoning. It showed that mining ecotype had a strong tolerance to Pb. Artemisia sacrorum Ledeb. var. Messerschmidtiana could be a kind of new germplasm resources for theoretical research and technical implementation of lead-contaminated soils.