Biogeochemical Hot Spots Reading

Reading for Lecture 9
1) Biogeochemical Hot Spots: patches that show disproportionately high reaction rates
- these can occur at the confluence of two rivers
- the confluences of hydrologic flow paths intersection
- water is a good sources of hot spots because it transports elements across space and it provides conditions for increased cycling rates
- hot spots can also occur in nonhydrologic areas such as the boundary or ecotone between two features of land

2) Hot moments: Periods of time during which rates of biogeochem. processes are enhanced
- an example is fire and leeching from near-stream soils during snowmelt in alpine watersheds
- many hot moments coincide with natural disturbances

**Hot spots and hot moments often overlap and they can also include animal and human disturbances such as overgrazing

Hot spot and hot moment detection is important for natural resource management because it involves N and organic C which can cause problems such as hypoxia, greenhouse gas fluxes, soil impoverishment, etc. Hot spots and hot moments need to be understood as a source and sink for N and organic C
- There is a growing sense of urgency about the tools and understanding needed to approach hot spots and hot moments.

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