苎麻对重金属铅耐受性及其修复铅污染土壤潜力研究  

Study on Pb Tolerance and Remediation Potential of Lead-contaminated Soil of Ramie

作　　者：黄闺[1] 孟桂元[1] 陈跃进[1] 柏连阳[1] 郭敏[1] 黄小丽[1] 谭洁云[1] 欧阳石先[1] 

机构地区：[1]湖南人文科技学院,湖南娄底417000

出　　处：《中国农学通报》2013年第20期148-152,共5页Chinese Agricultural Science Bulletin

基　　金：湖南省大学生研究性学习和创新性实验计划项目"苎麻对重金属铅耐受性及其修复铅污染土壤潜力研究"(5411211);湖南省环境保护厅重点项目"苎麻对重金属矿区废弃地生态修复效应研究"(3360901);全国公益性行业(农业)科研专项"麻类多年生野生植物保护利用技术研究"(201003021);湖南人文科技学院校级重点学科"作物遗传育种"

摘　　要：为了探明植物苎麻对重金属铅的耐受性及土壤修复效果,通过盆栽试验,分析了不同铅胁迫浓度处理下苎麻的生长及重金属变化特征。结果表明,低浓度处理(≤800mg/kg)能促进苎麻植株生长,株高、茎粗和生物量都有所增加,但都以500mg/kg胁迫处理最佳;此后随胁迫浓度增加抑制作用明显,至最高处理浓度2300mg/kg时,各生长指标较对照显著减少,但仍能完成生长周期,表明苎麻对重金属铅胁迫具有较强的耐受性。苎麻根部与地上部铅含量在≤2000mg/kg范围内随处理浓度提高而增加,最高值分别为173.59mg/kg和92.31mg/kg。地上部富集最大量为1188.36μg/pot,占全株35.47%;苎麻铅富集系数和转运系数分别为0.04～0.06和0.50～0.73。可见,苎麻对重金属铅富集能力有限,但转运能力较好,鉴于其根系发达、固土能力强和群体生物量大等特点,苎麻可作为目前重金属铅污染修复较理想的植物。In order to investigate the Pb tolerance and soil remediation effect, a pot experiment was conducted to observe the ramie growth and variation of the heavy metal in different lead stress treatment. The results showed that, Pb processing of low concentration （≤ 800 mg/kg） could promote the growth of ramie, its plant height, stem diameter and biomass showed the tendency to increase, but the 500 mg/kg stress treatment was the best. Thereafter, the inhibitory effect became obvious with increase of the stress concentration and the growth indexes reduced significantly than the control to the highest concentration 2300 mg/kg, but it still completed the growth cycle, which indicated ramie had a strong tolerance to Pb stress. The lead content of ramie roots and shoots increased with the concentration increasing （≤ 800 mg/kg range） and the highest values were 173.59 mg/kg, and 92.31 mg/kg respectively. The largest accumulation amount of Pb in shoot reached 1188.36 μg/pot, accounting for 35.47% of whole plant. The Pb factors of bioaccumulation and transfer were 0.04-0.06 and 0.50-0.73 respectively. Thence, the lead enrichment capacity of ramie was limited, but it hadbetter transport capacity. With a view of its well-developed root system and large shoot biomass, etc., it was still the desirable plants of heavy metal Pb-contaminated soil remediation.

关 键 词：苎麻 铅 耐受性 修复潜力 

分 类 号：S563.1[农业科学—作物学] S153