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BIO 150 F3L

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james marasigan

on 21 March 2014

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Transcript of BIO 150 F3L

BIO 150 F3L
Ms. Romella Beringuela
& FRIENDS
Prudenz Yleizer Lorredo
James Michael Marasigan
Ben Patrick Soliguin
Leian Victor Ticzon

PLANT LITTER DECOMPOSITION
INTRODUCTION
Nutrient Cycling - process of transforming, moving and reusing nutrients in an ecosystem



Decomposition - process by which decomposers acquire nutrients and energy from the detritus which is regulated by environmental factors

FACTORS AFFECTING NUTRIENT CYCLING
1. size of nutrient pool
2. rates of litterfall, mineralization, decomposition, and plant uptake
3. loss of nutrients through volatilization, denitrification and leaching
4. Temperature and precipitation
FACTORS AFFECTING DECOMPOSITION
1. temperature
2. pH
3. moisture content
4. aeration
5. nature and diversity of decomposers
6. nature of organic waste
OBJECTIVES
To measure the rates of plant litter decomposition
Determine the major groups of organisms
Construct a food web
MATERIALS
bamboo pegs
molten agar
water
net bags
leaves
electronic balance
scissors
Magnifier
petri dish
pipet
aspirator
test tube
paper box
news paper
alcohol lamp
lighter
PROCEDURE
8 bags of 50g plant litter were collected
6 samples were allowed to decay for 2 weeks while the other 2 were brought to the lab for weighing
fresh weights and dry weights of litter (W0,W1,W2) were determined
on the 2nd week faunal decomposers were identified and classified according to size
microbial decomposers were also counted
MICROBIAL PLATING PROCEDURE
FAUNAL ORGANISM IDENTIFICATION
RESULTS
MC =[(FW-DW)/FW]x100
% DM = 100 - %MC
r = lnWt - (lnWt+1)/t
Where:

MC = moisture content
DM = dry matter
r = rate of decomposition
Wt = dry weight at time t
Wt+1 = dry weight at next sampling period
t = time in weeks
FAUNAL DECOMPOSERS
The rate of decomposition is faster on the second week because as day passes by the number of decomposers increase
Studying faunal population is difficult because the faunal organisms are too small and often fragile. They tend to move quickly
Shredders are the most dominant faunal organism. As the detritus is in the stage of decomposition, shredders shred it into smaller pieces. other organisms will further break it down.
Bacteria and fungi convert organic material into inorganic material that will eventually be utilized by other organisms. However, we did not have any valid counts in our sample for microbial decomposers. This may be due to the following:
not enough dilution
forgot to pour samples
contamination
SUMMARY AND CONCLUSION
THANK YOU <3
Spider
Ant
Plant Detritus
Strepsiptera larvae
Earwigs
Proturan
Ferrisia virgata
Full transcript