Publication:
Analysis of phosphorus retention variations in constructed wetlands receiving variable loads from arable land
Analysis of phosphorus retention variations in constructed wetlands receiving variable loads from arable land
| dc.contributor.author | Johannesson, Karin | |
| dc.date.accessioned | 2023-12-22T06:14:15Z | |
| dc.date.available | 2023-12-22T06:14:15Z | |
| dc.date.issued | 2011 | |
| dc.description | Publisher: Linköpings universitet ; Source: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-67893 ; Level: Master | |
| dc.description.abstract | Seven wetlands, constructed on agricultural land in the south of Sweden, were investigated with respect to phosphorus (P) retention. The overall aim was to increase the understanding of P retention and find possible explanations for the variations in retention that have been observed in previous studies. This was done by i) investigating P retention in wetlands receiving various water and P loads, ii) investigating the effect of variations in water flow on P transport, iii) comparing how well retention estimates based on water quality data agreed with measurements of the amount of P accumulated in the sediment. Results showed that P retention was positive in all wetlands, but it was variable (1–58 kg ha-1 yr-1) and months with negative retention were observed in nearly all wetlands. Such monthly negative retention coincided with i) high flow periods, when particulate P was either flushed straight through the wetlands or resuspended from the bottoms, and ii) warm low flow periods, in which case dissolved P was probably released from wetland sediments due to anoxic conditions. The results from the two methods for estimating P retention differed. Based on water quality data, the total P load during four years was 65 kg ha-1 and the mean P retention 2.8 kg ha-1 yr-1, or 17% of the total P load. In contrast, the amount of P accumulated in the inlet zone alone amounted to 78% of the P load, and the P content in the upper sediment of the whole wetland area exceeded the P load with a factor four. This discrepancy showed the need to add studies of sediment accumulation to inflow-outflow estimates for an improved understanding of wetland P retention. | |
| dc.identifier.uri | http://repository.vlu.edu.vn:443/handle/123456789/11155 | |
| dc.language.iso | en_US | |
| dc.subject | Natural Sciences | |
| dc.subject | Naturvetenskap | |
| dc.title | Analysis of phosphorus retention variations in constructed wetlands receiving variable loads from arable land | |
| dc.type | Resource Types::text::thesis | |
| dspace.entity.type | Publication | |
| oairecerif.author.affiliation | #PLACEHOLDER_PARENT_METADATA_VALUE# |
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