Exogenously applied oxalic acid assists in the phytoremediation of Mn by Polygonum pubescens Blume cultivated in three Mn-contaminated soils  

作　　者：Kehui Liu Jie Xu Chenglong Dai Chunming Li Yi Li Jiangming Ma Fangming Yu 

机构地区：[1]Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection(Ministry of Education),Guangxi Normal University,Guilin,541004,China [2]College of Life Science,Guangxi Normal University,Guilin,541004,China [3]College of Environment and Resource,Guangxi Normal University,Guilin,541004,China [4]School of Life Sciences,Fudan University,Shanghai,200438,China [5]Institute of Sustainable Development and Innovation,Guangxi Normal University,Guilin,541006,China

出　　处：《Frontiers of Environmental Science & Engineering》2021年第5期109-121,共13页环境科学与工程前沿（英文）

基　　金：National Natural Science Foundation of China(Nos.41967019 and 41661077);the National Key Technologies Research and Development Program of China(No.2017YFD0801500);the Guangxi Science and Technology Development Project of Major Projects of Guangxi(Guike AA17204047-3);Scientific Research and Technology Development Program of Guilin(Nos.20190205 and 20180107-3).

摘　　要：The current study evaluated the effects of oxalic acid(OA)application on the growth and Mn phytoremediation efficiency of Polygonum pubescens Blume cultivated in three different manganese(Mn)-contaminated soils sampled from an unexplored area(US),an explored area(ES)and a tailing area(TS)of the Ertang Mn mine,South China.The supplied levels of OA were 0(control),1(low level),3(medium level),and 9(high level)mmol/kg,referred to as CK,OA1,OA3 and OA9,respectively.The results revealed that the average water-extractable Mn concentrations US,ES and TS amended with OA increased by 214.13,363.77 and 266.85%,respectively.All OA supply levels increased plant growth and Mn concentrations in US.The low OA supply level increased plant growth in ES and TS;however,contrasting results were found for the medium and high OA supply levels.Plant Mn concentrations and total Mn increased in ES and TS in response to all OA supply levels.Total Mn in the aerial parts increased by 81.18,44.17 and 83.17%in US,ES and TS,respectively;the corresponding percentages for the whole plants were 81.53,108.98 and 77.91%,respectively.The rate of·O_(2)^(−)production and malondialdehyde(MDA)concentrations increased in response to OA amendment,especially the medium and high OA supply levels in ES and TS.In general,antioxidant enzymes might play a vital role in alleviating Mn stress in plants cultivated in US,while non-enzymatic antioxidants might be the main factor for plants cultivated in ES and TS.

关 键 词：PHYTOREMEDIATION Mn-contaminated soil Mn hyperaccumulator Oxalic acid Remediation efficiency 

分 类 号：S15[农业科学—土壤学] X53[农业科学—农业基础科学]