Acids and bases in natural water; alkalinity, pH and buffer capacity - Nutrient loads and exports - Nutrient retention
3 important questions on Acids and bases in natural water; alkalinity, pH and buffer capacity - Nutrient loads and exports - Nutrient retention
What is nutrient retention?
The difference between inputs and the exported loads.
The difference between the incoming load and the exported load within a certain timeframe and within certain spatial boundaries.
Timeframe: season or year, but depending on the scope of research
spatial boundaries: catchment, network of ditches, river stretch or lake
The difference between the incoming load and the exported load within a certain timeframe and within certain spatial boundaries.
Timeframe: season or year, but depending on the scope of research
spatial boundaries: catchment, network of ditches, river stretch or lake
What are the two cases of nutrient retention?
Outgoing load < incoming load: water system acts as sink for nutrients. Retention has positive value.
Outgoing load > incoming load: for instance in lakes with laoded sediments or streams during periods of high flow conditions. Retention has negeative value.
Outgoing load > incoming load: for instance in lakes with laoded sediments or streams during periods of high flow conditions. Retention has negeative value.
What are the main processes that remove N and P from the water phase?
-sedimentation
-uptake by primary producers (algae and macrophytes)
-denitrification (just N), see par III>
-uptake by primary producers (algae and macrophytes)
-denitrification (just N), see par III>
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