苎麻种植密度对重金属Pb、As富集能力影响研究

Study on the Enrichment Ability of Heavy Metal Pb, As for Ramie in different Planting Density

以2个苎麻主栽品种为研究对象,设计了2种种植密度,研究苎麻在Pb、As污染农田中的生长情况及植物体内不同部位的Pb、As含量,期望从中发现不同的种植密度对苎麻产量以及对重金属Pb、As富集能力的影响。试验结果表明:不同的种植密度对苎麻的产量影响较大,"湘三"和"中一"正常密度产量分别为157.35kg/hm2和132kg/hm2,而高密度依次分别达到342.3kg/hm2和312.9kg/hm2;正常密度2个品种苎麻地上部Pb、As含量均高于高密度,Pb、As的小区迁移量都是湘三高密度最高,分别达到4.97mg/m2和0.194mg/m2,高密度会减少苎麻单株地上部重金属的含量,但是对重金属的总迁移量有所提高。

Two planting methods of two ramie varieties were designed to study the growth and heavy metal concentration of ramie in farmland with Pb, As pollution, in order to investigate the effect of different density on yield and heavy metal concentration. The results showed, different density had significant impact on yield. Yield of＂xiang 3＂ and ＂zhong 1＂ which planted on the base of normal density was 157.35 kg/ hm2 and 132 kg/ hm2 respectively. In the case of high density, yield of＂xiang 3＂ and ＂zhong 1＂ increased 2-3 times. Pb and As concentration of aboveground using normal density were higher than that of using high density. The highest translocation of Pb and As appeared in＂xiang 3＂uses high density, were 4.97 mg/m2 and 0.194 mg/m2 respectively. Different density could affect the heavy metal concentration of ramie. In the case of high density, heavy metal concentration of plant decreased, however, translocation would be improved.