To recover or not to recover – the ”Laurentius-equation” Søren Laurentius Nielsen Roskilde...
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Transcript of To recover or not to recover – the ”Laurentius-equation” Søren Laurentius Nielsen Roskilde...
![Page 1: To recover or not to recover – the ”Laurentius-equation” Søren Laurentius Nielsen Roskilde University.](https://reader035.fdocuments.us/reader035/viewer/2022081518/551a6c4555034643688b4f25/html5/thumbnails/1.jpg)
To recover or not to recover – the ”Laurentius-equation”
Søren Laurentius NielsenRoskilde University
![Page 2: To recover or not to recover – the ”Laurentius-equation” Søren Laurentius Nielsen Roskilde University.](https://reader035.fdocuments.us/reader035/viewer/2022081518/551a6c4555034643688b4f25/html5/thumbnails/2.jpg)
Original dataset based on:
• 162 transects /stations• 23 areas• Data from years 1980 –
1991• Data from the then
Danish counties
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Spearman- Rank Correlation Coefficients – all significant
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Established these relationships:
• Nutrients (N, P) → Phytoplankton biomass• Phytoplankton biomass + suspended matter →
Secchi depth• Secchi depth → Eelgrass depth limit• TN → Eelgrass depth limit
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N and P vs. Phytoplankton biomass2
2
2
ln( ) 1.072ln( ) 4.959 0.391
ln( ) 0.759ln( ) 1.197 0.277
ln( ) 0.806ln( ) 0.344ln( ) 4.666 0.414
phyto
phyto
phyto
B TN R
B TP R
B TN TP R
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2ln( ) 0.367 ln( ) 0.444ln( ) 2.686 0.808sd phytoZ Susp B R
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20.787 0.339 0.606c sdZ Z R
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2ln( ) 0.755ln( ) 6.039 0.547cZ TN R
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• The equations reflect a comparison between locations
• Not a development over time• Later uses imply a place for time substitution• Variation caused by differences among
locations in other factors
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Sediment characteristics suspected
2
0.703 / 12.2
0.703 0.082( / 12.2) / 12.2 0.81
c sd
c sd
Z Z C N
Z Z C N C N R
Krause-Jensen et al., Vand & Jord, 2007Krause-Jensen et al., MEPS, 2011
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(it might get quite complicated…)
Krause-Jensen et al., MEPS, 2011
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Causal links:
N - loading
N - concentration
Phyto-plankton
Light Depth limit
Algal mats
Organic matter
Changes insediment
Anoxia
Resus-pension
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Markager S., Carstensen J, Krause-Jensen D, Windolf J, Timmermann K. 2010. Technical report from NERI no. 787. http://www.dmu.dk/Pub/FR787.pdf
Based on empirical analyses of data from Skive Fjord, Horsens Fjord and Odense Fjord
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Kemp et al. 2009
Hysteresis and regime shifts
Duarte et al., Estuaries andCoasts, 2009
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Conceptual modelMarkager S., Carstensen J, Krause-Jensen D, Windolf J, Timmermann K. 2010. Technical report from NERI no. 787. http://www.dmu.dk/Pub/FR787.pdf
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Reasons for the hysteresisCausal links:
N - loading
N - concentration
Phyto-plankton
Light Depth limit
Algal mats
Organic matter
Changes insediment
Anoxia
Resus-pension
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3d dynamic model
Sediment physics
Sediment lability
Benthic fauna
Vegetation
Wave & current energy
Input Output
Hydrodynamic simulation
TD, sediment transport simulation
Ecological simulation
Erosion/deposition
Bio-sedimentation