商陆对锰污染土壤的修复实验研究

Experimental research of phytoremediation properties about Phytolacca acinosa on Mn-contaminated soil

关键词:  商陆  锰  植物修复  土壤

Key words:  Phytolacca acinosa  manganese  phytoremediation  soil

摘要:

商陆是在中国境内发现的多年生、草本型锰超积累植物。通过室内土培试验,评价商陆对土壤中锰的去除潜力,确定最佳收获时间,以期达到最佳的重金属污染土壤植物修复效果。结果表明:商陆能将土壤中的锰转运到地上部位,叶片中Mn含量最高,平均值为17 043 mg/kg DW,远远大于茎和根的锰含量均值; 单株的平均富集量在浓度为500 mg/kg DW时达最高,一棵商陆可富集平均13 mg的Mn; 动态修复中确定的最佳收获时间为60 d,不同时间收获的商陆地下部分生物量差异不明显(P>0.05),地上部分则差异较大。连续收获不改变其锰生物富集能力。这表明商陆对锰有较强的富集能力,是一种优良的修复锰污染土壤的物种,对土壤重金属污染的治理及植物修复领域数据库的完善具有重要意义。

Abstract:

Phyloalcca acinosa found in the territory of China is a kind of perennial and herbaceous manganese hyperaccumulator plant. In order to achieve the best effect of repairment, the potential of P. acinosa for removal of manganese in soil were evaluated, and confirmed the optimal harvest time, used by the indoor test of earth culture. The results showed that P. acinosa could transport Mn in soil to its aerial part. The Mn concentration in its leaves was the maximum, its average value was 17 043 mg/kg DW, and much greater than the average value of Mn concentration in its stems and roots separately. The average enrichment capacity of single plant reached the highest value when the concentration was 500 mg/kg DW. One Phyloalcca acinosa could enriched 13 mg Mn averagely. It was determinated that its best harvest time was 60 d in the dynamic experiment, the foot end's biomass of P. acinosa which was reaped in different time had unconspicuous diversity(P>0.05), while the aerial part had a bigger diversity. Sequential harvest wouldn't change the biological concentration ability of P. acinosa to Mn. These results indicated that P. acinosa had a strong accumulation ability to manganese, and it was a kind of excellent species to repair Mn-contaminated soil. This was significant for the treatment of heavy metal pollution of soil and the improvement of database in the field of phytoremediation.