class: center, middle, inverse # Transport II: the sequal --- #Review from last lecture: key structures: -Xylem -Vessel elements (99% of angiosperm species) -Tracheids (smaller than vessels; all vascular plants) -Pits -Phloem -Stomata -Cambium
--- #More review: key concepts: -Transpiration-photosynthesis compromise -Water potential -Stomatal regulation of water loss -Cohesion-tension theory -Embolism -Percent loss of conductance (PLC50) --- class: center, middle, inverse ###Cohesion-tension theory
--- class: center, middle, inverse # Now for this lecture: Key concepts: ##Plant level cycling ##Ecosystem level cycling ##Mass balance (bathtub) principles (conservation of mass)
--- class: center, middle, inverse # Things that plants need that are not water, sunlight, and CO2 ## Macronutrients: N, P, (K) ## Micronutrients: mostly metals (Iron, Magnesium, etc.)
--- ##Bathtub principles (conservation of mass)
### Pools and flows (always know whether you're discussing a pool or a flow) --- ##Bathtub principles (conservation of mass)
--- #Organisms are like choosy bathtubs
--- class: center, middle, inverse #Key elements for plants, think about this from molecules up ##Nitrogen (1.5% of healthy plant) ##Phosphorus (0.2% of healthy plant) ##Other stuff (base cations: CA, K, Mg) --- class: center, top #Review: what is the most common protein on earth? --- class: center, middle
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--- class: center, middle ##What is the most common biological molecule on earth? --- class: center, middle, inverse
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--- class: center, top, inverse ## Scaling up from leaf to globe: the global carbon cycle --
figure from Ricklefs --- class: center, top, inverse But it's not just about carbon... --
Animal tissues (endotherms) are about 15% nitrogen --
Growing leaves are about ~3% nitrogen --- class: center, top ## What is the biggest use of P in plants? --- class: center, top ##Uses of P
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Wright et al. 2004 Fast growing plants need a lot of N and P ---
Among the fastest rates of photosynthesis per mass in the world --- "Green revolution"
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##Haber-Bosch process ---
###A Phosphorus mine in Florida via NYtimes --- ###Fertilizer use in China
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Change in N deposition in g per Ha per year --- class: center, middle, inverse
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###Sigman & Hain (2012) Nature --- #Ecosystems -- from molecules
-- to the globe
--- # Key Ideas ## Bathtub principles (conservation of mass, measuring pools and flows) ## What do plants use N and P for ## Where does N and P on the global scale come from