1
|
Yu H, Le Roux JJ, Jiang Z, Sun F, Peng C, Li W. Soil nitrogen dynamics and competition during plant invasion: insights from Mikania micrantha invasions in China. THE NEW PHYTOLOGIST 2021; 229:3440-3452. [PMID: 33259063 DOI: 10.1111/nph.17125] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Accepted: 11/12/2020] [Indexed: 06/12/2023]
Abstract
Invasive plants often change a/biotic soil conditions to increase their competitiveness. We compared the microbially mediated soil nitrogen (N) cycle of invasive Mikania micrantha and two co-occurring native competitors, Persicaria chinensis and Paederia scandens. We assessed how differences in plant tissue N content, soil nutrients, N cycling rates, microbial biomass and activity, and diversity and abundance of N-cycling microbes associated with these species impact their competitiveness. Mikania micrantha outcompeted both native species by transferring more N to plant tissue (37.9-55.8% more than natives). We found total soil N to be at lowest, and available N highest, in M. micrantha rhizospheres, suggesting higher N cycling rates compared with both natives. Higher microbial biomass and enzyme activities in M. micrantha rhizospheres confirmed this, being positively correlated with soil N mineralization rates and available N. Mikania micrantha rhizospheres harbored highly diverse N-cycling microbes, including N-fixing, ammonia-oxidizing and denitrifying bacteria and ammonia-oxidizing archaea (AOA). Structural equation models indicated that M. micrantha obtained available N via AOA-mediated nitrification mainly. Field data mirrored our experimental findings. Nitrogen availability is elevated under M. micrantha invasion through enrichment of microbes that participate in N cycling, in turn increasing available N for plant growth, facilitating high interspecific competition.
Collapse
Affiliation(s)
- Hanxia Yu
- Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, Guangzhou Key laboratory of Subtropical Biodiversity and Biomonitoring, School of Life Sciences, South China Normal University, Guangzhou, 510631, China
| | - Johannes J Le Roux
- Department of Biological Sciences, Macquarie University, Sydney, NSW, 2109, Australia
| | - Zhaoyang Jiang
- Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, Guangzhou Key laboratory of Subtropical Biodiversity and Biomonitoring, School of Life Sciences, South China Normal University, Guangzhou, 510631, China
| | - Feng Sun
- Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, Guangzhou Key laboratory of Subtropical Biodiversity and Biomonitoring, School of Life Sciences, South China Normal University, Guangzhou, 510631, China
| | - Changlian Peng
- Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, Guangzhou Key laboratory of Subtropical Biodiversity and Biomonitoring, School of Life Sciences, South China Normal University, Guangzhou, 510631, China
| | - Weihua Li
- Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, Guangzhou Key laboratory of Subtropical Biodiversity and Biomonitoring, School of Life Sciences, South China Normal University, Guangzhou, 510631, China
| |
Collapse
|
2
|
Saggaï MM, Ainouche A, Nelson M, Cattin F, El Amrani A. Long-term investigation of constructed wetland wastewater treatment and reuse: Selection of adapted plant species for metaremediation. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2017; 201:120-128. [PMID: 28654800 DOI: 10.1016/j.jenvman.2017.06.040] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 06/05/2017] [Accepted: 06/18/2017] [Indexed: 06/07/2023]
Abstract
A highly diverse plant community in a constructed wetland was used to investigate an ecological treatment system for human wastewater in an arid climate. The eight-year operation of the system has allowed the identification of a highly adapted and effective plant consortium that is convenient for plant-assisted metaremediation of wastewater. This constructed wetland pilot station demonstrated effective performance over this extended period. Originally, there were twenty-five plant species. However, because of environmental constraints and pressure from interspecific competition, only seven species persisted. Interestingly, the molecular phylogenetic analyses and an investigation of the photosynthetic physiology showed that the naturally selected plants are predominately monocot species with C4 or C4-like photosynthetic pathways. Despite the loss of 72% of initially used species in the constructed wetland, the removal efficiencies of BOD, COD, TSS, total phosphorus, ammonia and nitrate were maintained at high levels, approximately 90%, 80%, 94%, 60% and 50%, respectively. Concomitantly, the microbiological water tests showed an extremely high reduction of total coliform bacteria and streptococci, about 99%, even without a specific disinfection step. Hence, the constructed wetland system produced water of high quality that can be used for agricultural purposes. In the present investigation, we provide a comprehensive set of plant species that might be used for long-term and large-scale wastewater treatment.
Collapse
Affiliation(s)
- Mohamed Mounir Saggaï
- University of Rennes 1, OSUR/CNRS-UMR 6553, Ecosystèmes-Biodiversité-Evolution, campus de Beaulieu, Bâtiment 14A, 35042, Rennes Cedex, France; University of Kasdi Merbah Ouargla, Laboratoire de Bioressources Sahariennes: Préservation et Valorisation, BP 511 route de Ghardaïa, Ouargla, 30000, Algeria.
| | - Abdelkader Ainouche
- University of Rennes 1, OSUR/CNRS-UMR 6553, Ecosystèmes-Biodiversité-Evolution, campus de Beaulieu, Bâtiment 14A, 35042, Rennes Cedex, France.
| | - Mark Nelson
- Institute of Ecotechnics, 24 Old Gloucester St., London, WC1 3AL, UK; Wastewater Gardens International, Santa Fe, NM, 87508, USA.
| | - Florence Cattin
- Institute of Ecotechnics, 24 Old Gloucester St., London, WC1 3AL, UK; Wastewater Gardens International, Santa Fe, NM, 87508, USA.
| | - Abdelhak El Amrani
- University of Rennes 1, OSUR/CNRS-UMR 6553, Ecosystèmes-Biodiversité-Evolution, campus de Beaulieu, Bâtiment 14A, 35042, Rennes Cedex, France.
| |
Collapse
|