伴矿景天重金属吸收与土壤阳离子养分供应的关系——基于中国南方地区土壤大样本的盆栽试验  

Relationship Between Heavy Metal Uptake and Soil Cationic Nutrient Supply in Sedum plumbizincicola:Pot Experiment Based on Large Number of Soil Samples in Southern China

作　　者：黄玉峰 史自军 周嘉文 黄永杰[1,3,5] HUANG Yufeng;SHI Zijun;ZHOU Jiawen;HUANG Yongjie(School of Ecology and Environment,Anhui Normal University,Wuhu,Anhui 241000,China;Institute of Soil Science,Chinese Academy of Sciences,Nanjing 211135,China;Center of Cooperative Innovation for Recovery and Reconstruction of Degraded Ecosystem in Wanjiang City Belt,Wuhu,Anhui 241000,China;Yugan County Management Office of Modern Agriculture Model District,Shangrao,Jiangxi 335199,China;Provincial Key Laboratory of Biotic Environment and Ecological Safety in Anhui,Wuhu,Anhui 241000,China)

机构地区：[1]安徽师范大学生态与环境学院,安徽芜湖241000 [2]中国科学院南京土壤研究所,南京211135 [3]皖江流域退化生态系统的恢复与重建省部共建协同创新中心,安徽芜湖241000 [4]江西省余干县现代农业示范区管理办公室,江西上饶335199 [5]生物环境与生态安全安徽省高校省级重点实验室,安徽芜湖241000

出　　处：《土壤》2024年第5期1067-1076,共10页Soils

基　　金：安徽省高等学校自然科学基金项目(KJ2019A0507);芜湖市科技局项目(2023JC18);国家重点研发计划项目(2019YFC1804703)资助。

摘　　要：探究伴矿景天(Sedum plumbizincicola)镉(Cd)、锌(Zn)吸收与土壤阳离子养分元素供应的关系,以期从养分调控角度指导提高超积累植物的修复效率。采用盆栽试验比较了中国南方地区不同类型、不同耕作方式和不同污染程度的49个土壤上伴矿景天生长及重金属吸收情况,利用相关分析、广义梯度增强模型等手段挖掘限制植物重金属吸收的关键阳离子养分因子。结果表明:(1)土壤全量锰(Mn)和铁(Fe)是影响伴矿景天生长的主要养分因子,贡献率分别为34.61%和16.31%;(2)有效态钙(Ca)、全量镁(Mg)与地上部Cd含量及吸收量显著正相关,其对地上部Cd含量的贡献率为16.90%和10.39%,而有效Mg对地上部Cd含量的贡献率为14.21%;有效Mn对伴矿景天Zn吸收影响最大,其对地上部Zn含量和吸收量的贡献率分别为17.76%和20.86%。土壤不同阳离子养分元素的供应对伴矿景天生长和重金属吸收能力有一定的影响,其中土壤Mg和Mn是影响伴矿景天Cd和Zn吸收的重要养分元素,今后可通过调控养分供应促进伴矿景天Cd和Zn的吸收,提高修复效率。To explore the relationship between cadmium(Cd)and zinc(Zn)uptake in Sedum plumbizincicola and the supply of soil cation nutrient elements,and guide the enhancement of phytoextraction performance of hyperaccumulators from the perspective of nutrient regulation,a pot experiment was conducted in 49 soils with different types,cultivation methods,and pollution levels collected from the southern China.Plant growth and metal uptake of Sedum plumbizincicola were studied,and correlation analysis and Generalized Boosted Models were used to find the key cation nutrient factors controlling metal uptake in plants.The results showed that:1)Soil total manganese(Mn)and iron(Fe)were the main nutrient factors affecting shoot biomass of Sedum plumbizincicola,with contribution rates of 34.61%and 16.31%,respectively.2)The available calcium(Ca)and total magnesium(Mg)were significantly positively correlated with shoot Cd concentration and uptake.Their contribution rates to shoot Cd concentration were 16.90%and 10.39%,respectively.The contribution rate of available Mg to shoot Cd concentration was 14.21%.Available Mn showed the greatest impact on Zn accumulation in Sedum plumbizincicola,with its contribution rates to shoot Zn concentration and uptake of 17.76%and 20.86%,respectively.In summary,the supplies of soil cation nutrients affect the growth and metal uptake of Sedum plumbizincicola to a certain extent,among which soil Mg and Mn supplies are two major important factors.Via regulating nutrient supply,it can enhance Cd and Zn uptake by Sedum plumbizincicola,thereby improving metal removal efficiency in the contaminated soils.

关 键 词：养分元素 伴矿景天 土壤污染 吸取修复 

分 类 号：X53[环境科学与工程—环境工程]