【摘要】 通过温室盆栽试验,研究了超积累植物龙葵、非超积累植物黑麦草、苋菜分别与玉米间作条件下对重金属Cd的积累特性。结果表明,几种间作作物中地上部生物量最大的是龙葵,其次是苋菜,最小的是黑麦草,其中土壤Cd浓度为1.59 mg/kg时,龙葵地上部生物量分别是苋菜、黑麦草的2.41、10.6倍;土壤Cd浓度为1.92 mg/kg时,龙葵地上部生物量分别是苋菜、黑麦草的2.42、9.06倍,3种富集植物地上部生物量的差异达到显著水平。玉米间作条件下超积累植物龙葵各器官中Cd含量表现为叶>茎>籽粒>根,即地上部大于根部;而苋菜中Cd含量表现为根>茎>叶,黑麦草中Cd含量表现为根部>地上部,即非超积累植物Cd含量为根部大于地上部。土壤中Cd含量为1.59 mg/kg时,龙葵地上部Cd累积量分别为苋菜、黑麦草的28.0、59.9倍;龙葵的富集系数是苋菜、黑麦草的28.2、59.3倍,转运系数分别是苋菜、黑麦草的8.08、55.9倍。土壤中Cd含量为1.92 mg/kg时,龙葵地上部Cd累积量分别为苋菜、黑麦草的30.8、43.5倍;龙葵的富集系数分别是苋菜、黑麦草的29.4、41.4倍,转运系数分别是苋菜、黑麦草的7.98、53.6倍。综上可知,超积累植物龙葵对土壤中Cd的吸收与转运能力远远大于非超积累植物苋菜、黑麦草,龙葵是最理想的与玉米间作的Cd污染土壤修复的植物修复材料。更多还原

【Abstract】 Through pot experiment in greenhouse,the accumulation characteristics of heavy metal Cd were studied in hyperaccumulator Solanum nigrum L.,non hyperaccumulator Lolium perence L.,Amaranthus mangostanus L. under intercropping of maize. The results showed that the largest shoots biomass of several intercropping crops was the Solanum nigrum L.,followed by Amaranthus mangostanus L.,and the smallest was Lolium perenne L. The Cd content in the organs of hyperaccumulator Solanum nigrum L. was:leaf>stem>grain>root,the shoots was larger than root;while the Cd content in Amaranth mangostanus L. was:root>stem>leaf,and the Cd content in Lolium pernne L. was:root>shoots,the Cd content of non hyperaccumulator was showed as root greater than shoots. The Cd content in soil was 1.59 mg/kg,the Cd accumulation in the shoots of Solanum nigrum L. was 28.2 and 59.3 times of Amaranth mangostanus L. and Lolium perenne L.,respectively,and the transport coefficient was 8.08 and 55.9 times of Amaranth mangostanus L. and Lolium perenne L. The Cd content in soil was 1.92 mg/kg,the Cd accumulation in the shoots of Solanum nigrum L. was 30.8 and 43.5 times of Amaranth mangostanus L. and Lolium perenne L.,respectively;the enrichment coefficient of hyperaccumulator Solanum nigrum L.was 29.4 and 41.4 times of Amaranth mangostanus L. and Lolium perenne L.,and the transport coefficient was 7.98 and 53.6 times of Amaranth mangostanus L. and Lolium perenne L. Thus,Solanum nigrum L. could be the most ideal phytoremediation material which intercropping with maize in Cd contaminated soil.更多还原