BIOB50H3 Lecture Notes - Lecture 4: Normalized Difference Vegetation Index, Chlorophyll, Chemosynthesis
Document Summary
Lecture 4: it s all about energy: primary production. Energy assimilated by autotrophs is stored as carbon compounds in plant tissues; carbon is the currency used for the measurement of primary production. Primary productivity is the rate of primary production. How much carbon are the autotrophs xing and turning into biomass (sugar) = primary productivity. Gross primary production (gpp): total amount of carbon xed by autotrophs in an ecosystem. Gpp depends on the in uence of climate (precipitation, temperature, etc) on photosynthetic rate and the leaf are index (lai) - leaf are per unit of ground area! Lai = how much the group is covered by leaves. Lai=1 = 100% of ground is covered by leaves. A single layer can t capture all the radiation coming through, a lot actually passes through the single layer. Additional layers = allow you to capture more energy.