Nitrogen application and mowings improve chromium phytoextraction efficiency of Leersia hexandra Swartz

IF 6 3区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Sciences Europe Pub Date : 2025-04-25 DOI:10.1186/s12302-025-01102-z

Mengting Lin, Xusheng Jiang, Shiqi Chen, Chao Xiao, Jie Liu

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Abstract

Phytoextraction is a promising option for Cr-contaminated soil, but the long remediation period remains a primary hindrance to its large-scale application. This study is the first to assess the combined effects of nitrogen addition and mowings (NM) on the growth and Cr extraction of Leersia hexandra Swartz. A 1-year plot experiment was conducted, revealing that NM promoted the growth of L. hexandra. Compared to the control, NM significantly increased shoot biomass of L. hexandra by 111% (p < 0.05). The shoot biomass harvested from the second and third mowing sessions was 1.35 and 3.34 times higher than that from the first mowing session, respectively. In addition, chlorophyll content, root activity, and auxin content were significantly higher in NM treatment than those in control. These results indicate that a single addition of ammonium sulfate provides nutrients for L. hexandra shoot regeneration and maintains good growth after mowing. Furthermore, the extracted Cr amount in the shoot of NM reached 25.4 g/m², an increase of 48.3% compared with control (p < 0.05). The soil Cr removal rate in NM was 1.85 times that of control (p < 0.001). These findings indicated that, compared with the phytoremediation technology using only L. hexandra, NM is a promising method for promoting Cr phytoextraction, suggesting its potential for large-scale ecological restoration at a lower cost.

Graphical abstract

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施氮和刈割提高了六芒草铬的植物提取效率

植物萃取法是修复铬污染土壤的一种很有前途的方法，但修复周期长仍然是其大规模应用的主要障碍。本研究首次研究了氮肥添加和刈割（NM）对鹿角草生长和Cr提取的联合影响。1年小区试验结果表明，NM对六芒草的生长有促进作用。与对照相比，NM显著提高了六子草地上部生物量111% （p < 0.05）。第二次和第三次刈割收获的茎部生物量分别是第一次刈割收获的1.35倍和3.34倍。此外，NM处理的叶绿素含量、根系活性和生长素含量显著高于对照。上述结果表明，单次添加硫酸铵可为羊草茎部再生提供养分，并在刈割后保持良好的生长。纳米藻茎部Cr提取量达到25.4 g/m2，较对照提高48.3% （p < 0.05）。NM对土壤铬的去除率是对照的1.85倍（p < 0.001）。这些结果表明，与仅利用六andra的植物修复技术相比，NM是一种很有前景的促进Cr植物提取的方法，表明其具有以较低的成本进行大规模生态修复的潜力。图形抽象

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来源期刊

Environmental Sciences Europe Environmental Science-Pollution

CiteScore

11.20

自引率

1.70%

发文量

110

审稿时长

13 weeks

期刊介绍： ESEU is an international journal, focusing primarily on Europe, with a broad scope covering all aspects of environmental sciences, including the main topic regulation. ESEU will discuss the entanglement between environmental sciences and regulation because, in recent years, there have been misunderstandings and even disagreement between stakeholders in these two areas. ESEU will help to improve the comprehension of issues between environmental sciences and regulation. ESEU will be an outlet from the German-speaking (DACH) countries to Europe and an inlet from Europe to the DACH countries regarding environmental sciences and regulation. Moreover, ESEU will facilitate the exchange of ideas and interaction between Europe and the DACH countries regarding environmental regulatory issues. Although Europe is at the center of ESEU, the journal will not exclude the rest of the world, because regulatory issues pertaining to environmental sciences can be fully seen only from a global perspective.