BIO 2129 Lecture Notes - Natural Resource, Carbon Sink, Transpiration
Document Summary
Boreal sheild: underlying substrate not soluble, granitic substrate, dissolves and weathers slowly. Cant provide nutrients because granite is insoluble: not fertile, drainage leads to wetland formation. Sequesters carbon, the most soil carbon in the world and into biomass (fixed into vegetation): could change from a carbon sink to carbon source. Drier can change trajectory of carbon cyclation pulling from air and putting it back: could be a feet forward in climate change, makes 27 years worth of co2. Change disturbance regime: forest fire, change frequency change wether particular location age, increase will accelerate carbon release. Dry out soils causes decay ( b ecause they were waterlogged, rots) releases methane and carbon. Changing conditions could change it into a source: widespread fires, can become out of control, hundreds of km, can lose timber, valuable for generation. Seroganeous cones, seeds are ejected from cones at certain temp, (forest regeneration: forest fires bring natural mosaics,fire weeds colonize well and get there first.
