100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
BDE 214: Ecosystems $4.08   Add to cart

Class notes

BDE 214: Ecosystems

 8 views  2 purchases
  • Course
  • Institution

A 34 page summary of all information covered in the lectures of Ecosystems, BDE 214. This summary contains the given work from the power points and extra definitions, explanations and diagrams from online resources. Tables and bullet points are used to aid memorisation.

Preview 4 out of 34  pages

  • August 18, 2021
  • 34
  • 2021/2022
  • Class notes
  • N/a
  • All classes
  • Unknown
avatar-seller
BDE 214: Ecosystems


Lecture One: Systems Ecology Energetics
Definitions Angiosperms: Plants that produce flowers and fruit. The seeds
develop in the flower and are protected in the fruit.

Gymnosperms: Plants that only produce seeds.

Autotroph: Organisms which make their own organic compounds.

Standing Crop (SCB): The total biomass of a system.

GPP: Gross Primary Production

NPP: Net Primary Production

ANPP: Above-ground Net Primary Production

Photosynthesis Revision




Image: https://gosciencegirls.com/photosynthesis-guide-experiments/

Transportation in Photosynthesis
● Water enters the leaf via the xylem.
● CO2 enters via the stomata (diffusion).
● Light is absorbed by chlorophyll.

Note: The unit to measure carbon dioxide in the atmosphere is
parts per million.

There is a lot of oxygen in the atmosphere and plants use rubisco
to fix oxygen for their use. As CO 2 increases in the atmosphere,
plants become more productive.

Rainfall, light and temperature has an effect on the productivity of
plants and photosynthesis. See examples of effects below.




1

, Rainfall
Adjusted root depth, soil types, competing plants and types of
xylems that evolved. Angiosperms have vessels and
gymnosperms have tracheas (thin and narrow). The thinner and
narrower trachea is less efficient. But this is sufficient in dry areas.

Light
Cloud cover effects, day lengths, time of day.

Temperature
Rate of metabolic reactions.

Productivity Introduction




Source:
https://www.khanacademy.org/science/biology/ecology/intro-to-ecosystems/a/ene
rgy-flow-primary-productivity

Energy Transfer in The energy fixed by photosynthesis is the basis of primary
Photosynthesis production.

The rate of conversion of radiant energy to organic compounds =
primary productivity.

GPP (Gross Primary Production): The total rate of
photosynthesis.

NPP (Net Primary Production): The GPP-autotrophic respiration.
The rate at which material is accumulated in excess of respiration.

The units used for this are kcal/m^2/year or g/m^2/year.

Standing Crop Standing crop is the total biomass of an ecosystem and its
components at a given time. This is not the same thing as
productivity.



2

, Image: http://www.sliderbase.com/spitem-1477-4.html

GPP & NPP




Image: Lecture Notes

The GPP & NPP indicate the ecosystems health and productivity.

NEE NEE is the Net Ecosystem Exchange.

This is the measure of the net exchange of C between an
ecosystem.




3

, Image:
https://biology.stackexchange.com/questions/81773/what-does-the-difference-bet
ween-gpp-npp-represent

Measuring NPP Measuring NPP is done by analyzing change in biomass (standing
crop).

SCB: Standing Crop Biomass (This takes account of the losses
due to autotrophic respiration).
t: Time

ΔSCB = SCBt2 ‐ SCBt1
But the losses due to death (D) and consumption (C) must be
included to calculate NPP.

NPP = ΔSCB + D + C
Belowground Biomass
● This is the biomass present below ground (roots).
● Errors in the calculations occur due to belowground
biomass.
● This is fixed by using ANPP, the Above-ground Net Primary
Production.

Measuring ANPP
Litterfall traps are used to measure above ground net primary
production. This method is not foolproof.

Ecosystem Flux
Measurement
3D Sonic Anemometer Gas Analyzer

Measures vertical wind speed Measures CO2 density and
and temperature. H2O density.




4

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller tegangibaud. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $4.08. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

83430 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$4.08  2x  sold
  • (0)
  Add to cart