不同浓度镉胁迫下铺地竹的富集与分配特征研究  

Enrichment and Distribution Characteristics of Sasa Argenteastriatus Under Different Levels Cd Stress

作　　者：尹鹏[1,2] 张媛媛 胡霞[1] YIN Peng;ZHANG Yuanyuan;Hu Xia(College of Life Science,Leshan Normal University,Leshan,Sichuan 614004,China;Bamboo Diseases and Pests Control and Resources Development Key Laboratory of Sichuan Province,Leshan Normal University,Leshan,Sichuan 614004,China)

机构地区：[1]乐山师范学院生命科学学院,四川乐山614000 [2]竹类病虫防控与资源开发四川省重点实验室(乐山师范学院),四川乐山614004

出　　处：《乐山师范学院学报》2021年第8期24-29,共6页Journal of Leshan Normal University

基　　金：竹类病虫防控与资源开发四川省重点实验室项目(17ZZ004,17ZZ005);四川省教育厅资助科研项目(18ZA0245);中国科学院山地生态恢复与生物资源利用重点实验室,生态恢复与生物多样性保育四川省重点实验室项目(KXYSWS2004);乐山师范学院科研项目(ZZ201821,LZDP008);国家自然基金项目(31500346)。

摘　　要：为了研究铺地竹(Sasa argenteastriatus)对镉污染土壤的修复作用,采用盆栽试验研究不同浓度镉污染下铺地竹根茎叶的生物量和镉质量浓度,并分析铺地竹各器官富集系数、转运系数和植株耐受能力。低浓度镉污染促进铺地竹叶片生物量的少量增长,平均每棵植株叶片重量比对照增加了0.4-0.6 g。高镉污染下地上和地下生物量均被明显抑制,分别较对照降低了36%和49%。随土壤镉污染的加剧,铺地竹植株各部位镉质量浓度也显著增加,尤其铺地竹根表现尤为明显;当高浓度的镉(50 mg·kg^(-1))添加到土壤时,铺地竹根中镉质量分数达到最高,为8.61 mg·kg^(-1);不同镉污染土壤对镉的富集效率大小顺序相同,均表现为根>茎>叶。铺地竹土-根转运系数较低,尤其在高浓度镉毒害作用下更低,仅为0.0051,茎-叶转运系数则较高,可达1以上,表明铺地竹植株通过减少根系对镉的吸收来避免受到毒害。地上部分每年对低浓度土壤Cd的提取量为36.13 g·hm^(-2)。铺地竹可用于低镉污染和易滑坡地区土壤镉污染修复。In order to study the phytoremediation of cadmium-contaminated soil by Sasa argenteastriatus,the biomass and cadmium concentration of Sasa argenteastriatus under different concentrations of cadmium pollution were studied by pot experiment,and the enrichment coefficient,Transport coefficient and tolerance of the plant were analyzed.The results showed that CD pollution of low concentration increased the biomass of bamboo leaves slightly,and the average leaf weight per plant increased by 0.4-0.6 g compared with the control.The aboveground and underground biomass under high cadmium pollution were obviously inhibited,which decreased by 36%and 49%respectively.With the aggravation of soil cadmium pollution,the cadmium concentration in all parts of Sasa argenteastriatus increased significantly,especially in the root.When 50 mg·kg^(-1)cadmium was added to the soil,the content of cadmium in roots of Sasa argenteastriatus reached the highest,which was 8.61 mg·kg^(-1).The accumulation efficiency of cadmium in different treatments was in the same order:root>stem>leaf.The soil-root transfer coefficient of Sasa argenteastriatus was lower,especially in the soil polluted by high concentration of cadmium,only 0.0051.The transfer coefficient of stem-leaf was higher than 1.The results showed that the plant could avoid the toxicity of cadmium by reducing the absorption of cadmium in roots.The Cd amount of Sasa argenteastriatus extracted from the low concentration soil was 36.13 g·hm^(-2).It can be used for soil remediation in areas with low cadmium pollution and landslide-prone.

关 键 词：铺地竹 土壤镉污染 生物量 富集系数 转运系数 耐受指数 

分 类 号：S19[农业科学—农业基础科学] X53[环境科学与工程—环境工程]