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16 Cards in this Set

  • Front
  • Back
Thermodynamic Concepts
1 and 2 law of Thermodynamics
Energy is neither created nor destroyed.
Transformations of energy are inefficient released in the form of waste heat
Gross Primary Production
total energy assimilated by primary producers
Net Primary Prodcution
Energy accumulated in stored form by primary producers
Respiration=
gross-net, the energy consumed by producers for maintenance and biosynthesis
What Limits Primary Production
Efficiency is between 1-2%,
limis:
Light
Temp
Water
Nutrient
Ecological vs Cultural Energy
Ecological- energy inputs are direct or indirect solar gains; remained fixed
Cultural- supplied by humans to achieve ag obj
industrial- non bio sources
Biological- from animal and human sources
Macronutrients
N, P, K, Ca, Mg, S,
Liebig's Law of the minimum
organisms are generally limited by only 1 single factor that is in short supply relative to demand
Importance of Nitrogen
most limiting nutrient
Adequate N produces higher yields
N fertilizer is expensice
Nitrification
oxidation of NH4+ to NO3- by two specialized groups of autotrophic bacteria
Organic N
living and dead plants >95% of total N
Inorganic N
Nitrate
Nitrite
Ammonium
Denitrificication
Conversion of NO3- to N2 gas
affected by
o2 availability
energy availability
NO3 conc
Haber Bosch Process
synthesizing ammonia fertilizer from N2
6 N losses
surface runoff
leaching
denitrification
volitization
Harvest
burning
Reducing Nutrient pollution
vegetable buffer strips for filtration
cover cropping