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DOI | 10.1016/j.scitotenv.2020.136960 |
Experimental harvesting of wetland plants to evaluate trade-offs between reducing methane emissions and removing nutrients accumulated to the biomass in constructed wetlands | |
Kasak K.; Valach A.C.; Rey-Sanchez C.; Kill K.; Shortt R.; Liu J.; Dronova I.; Mander Ü.; Szutu D.; Verfaillie J.; Baldocchi D.D. | |
发表日期 | 2020 |
ISSN | 489697 |
卷号 | 715 |
英文摘要 | Constructed wetlands built for water treatment often need biomass harvesting to remove nutrients from the system. Usually harvesting is done during the peak growing season to maximize the amount of nutrients removed from the system. This, however, can create huge methane fluxes that escape from plant tissues to the atmosphere. We used manual chambers and eddy covariance measurements to analyze the increase in methane emissions due to the harvesting of two common wetland species, Typha spp. and Schoenoplectus spp., in two climatically different constructed wetlands in Estonia and California. In addition, we determined the biomass nutrient and carbon concentrations from harvested biomass. We found that harvesting during the summer season, e.g. June and August, resulted in a significant release of methane at both sites. At the California site, baseline median methane emissions were 217.6 nmol m− 2 s− 1, and harvesting resulted in increases to 395.4 nmol m− 2 s− 1 that decreased to baseline emission within three days. Footprint modeling demonstrated that the emission increases measured by eddy covariance were dominated by contributions from the cut area to the total footprint signal. At the Estonian site, harvesting resulted in methane increases of 15.9 nmol m− 2 s− 1 to 110.4 nmol m− 2 s− 1 in August. However, in September and October the emission was significantly lower. Plant biomass analyses showed clear temporal dynamics in terms of nutrient concentration, being highest in summer and lowest in winter. Our experiments indicate that the optimal time for aboveground biomass harvesting is at the end of the growing season before nutrient translocation to belowground plant structures begins coinciding with lowest methane emissions. Therefore, strategic planning of the harvest timing may help reduce greenhouse gas emissions from managed wetlands and thus improve their multi-faceted ecological benefit. © 2020 Elsevier B.V. |
英文关键词 | Biomass harvesting; Eddy covariance; Methane; Nutrients; Wetland management; Wetlands |
scopus关键词 | Biomass; Economic and social effects; Gas emissions; Greenhouse gases; Harvesting; Methane; Water treatment; Wetlands; Above ground biomass; Biomass harvesting; Carbon concentrations; Eddy covariance; Eddy covariance measurements; Nutrient concentrations; Nutrient translocation; Wetland management; Nutrients; methane; carbon dioxide; methane; aboveground biomass; carbon emission; concentration (composition); constructed wetland; eddy covariance; grass; harvesting; methane; nutrient; trade-off; wetland management; Article; biomass; California; carbon footprint; constructed wetland; controlled study; Eddy covariance; Estonia; harvesting; nonhuman; nutrient; nutrient concentration; plant nutrient; priority journal; Schoenoplectus; seasonal variation; Typha; biomass; wetland; California; Estonia; United States; Schoenoplectus; Typha; Biomass; California; Carbon Dioxide; Estonia; Methane; Nutrients; Wetlands |
来源期刊 | Science of the Total Environment |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/176918 |
作者单位 | Ecosystem Science Division, Department of Environmental Science, Policy and Management, University of California, 105 Hilgard Hall, Berkeley, 94709, United States; Department of Geography, Institute of Ecology and Earth Sciences, University of Tartu, Vanemuise 46, Tartu, 51014, Estonia; Department of Geography and Resource Management, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong; Department of Landscape Architecture and Environmental Planning, College of Environmental Design, University of California, Berkeley, United States |
推荐引用方式 GB/T 7714 | Kasak K.,Valach A.C.,Rey-Sanchez C.,et al. Experimental harvesting of wetland plants to evaluate trade-offs between reducing methane emissions and removing nutrients accumulated to the biomass in constructed wetlands[J],2020,715. |
APA | Kasak K..,Valach A.C..,Rey-Sanchez C..,Kill K..,Shortt R..,...&Baldocchi D.D..(2020).Experimental harvesting of wetland plants to evaluate trade-offs between reducing methane emissions and removing nutrients accumulated to the biomass in constructed wetlands.Science of the Total Environment,715. |
MLA | Kasak K.,et al."Experimental harvesting of wetland plants to evaluate trade-offs between reducing methane emissions and removing nutrients accumulated to the biomass in constructed wetlands".Science of the Total Environment 715(2020). |
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