giussani et al 2001 stowe and teeri 1978
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Giussani et al 2001
Stowe and Teeri 1978
Investigation 2 – Causes and consequences of energy and carbon dynamics in biological systems: Scaling from
molecules to ecosystems
Pigment & enzyme chemistry;Cell/leaf anatomy
Leaf photosynthesis; leaf respiration
Individual growth rate
Resource allocation
Carbon and energy dynamics in ecosystems
Species interactionsCommunity structureEnvironmental conditionsPeriodic fire
today’s exercise
CERA researchat end of semester
Investigation 2 – Causes and consequences of energy and carbon dynamics in biological systems: Scaling from
molecules to ecosystems
allocation
Biochem
Anatomy
Physiology
Energy, matter, allocation, and growthin a vascular plant
E C
H2O
ions
RGR
RGR
What is RGR?
[Mass time time t+1 – Mass time t ] [Mass time t · time interval]
units? Time –1
meaning – RGR’s like an interest rate
initial account size
interest rate d-1
acct size in 100 d
100
0.05 = (105-100/100)
100(1.05)100 = 13,150
100
0.06
100(1.06)100 = 33,930
50
0.06
50(1.05)100 = 16,965
therefore RGR = good measure of size increase rate
Cast of characters
B ro m u s ka lm i (w ild chess )
G rass fam ily (P oaceae)
E lym u s ca na den sis
(C anada w ild rye) (P o aceae)
A nd ro po go n gerard ii
(b ig b lues tem ) (P oaceae)
A m aran th us re tro flexu s
(red roo t p igw eed ) (A m aran th aceae)
E lym u s villo su s
(ha iry w ildrye) (P o ac eae )
S orgh as tru m n utan s
(In d ian grass ) (P o ac eae )
P an icu m v irg atum
(sw itchg rass ) (P o ace ae)
A nd ro po go n scop ar ius
(= S chyza ch yrium sco pa riu m ) (lit tle b lu estem ) (P oaceae)
E lym us v irg in icu s
(V irg in ia w ildrye) (P o ac eae)
"We will also fund additional research in cutting edge methods in producing ethanol...not just from corn, but from wood chips, stalks, or switchgrass." GW Bush, 2006 SOTU address.
There’sa nicestandof littlebluestemsouth ofKershaw.
Where did the data come from?
A) Biochemical traits
1) C3 v. C4 photosynthesis
phylogenyof C4 traitsin grassfamily
Where did the data come from?A) Biochemical traits
2) Chlorophyll concentration
Grind the 9 cm2 of leaf tissue in 9 ml of 80% acetone.
Centrifuge at full speed for 5 min.
Dilute supernatant to 10 ml with 80% acetone.
Total chlorophyll mg/ml = 0.0202 A645 + 0.00802 A663
mg chlorophyll per gram fresh weight:=
= [mg. chlor./ml X volume of extract (ml)] ÷ fresh weight (g)
Where did the data come from?
B) Leaf gas exchange
1) Photosynthetic rate
2) Respiration rate
http://web.grinnell.edu/courses/bio/qubitmanual/Information/Respiration/intro.htm
Where did the data come from?
C) Resource allocation
Root fraction
Grow plants individually
Initial harvest at 1 month
• clip shoots• wash roots• dry 48 h at 65°C• weigh• root wt / total wt
Where did the data come from?
D) Growth rate
RGR
Grow plants individually
2nd harvest 1 wk later
• unearth & wash• dry 48 h at 65°C• weigh
RGR =
(Massfinal – Massinitial)Massinitial wk
Today’s plan
1) Take the variables in Table 1 groups create models depicting:A) Relationships among variablesB) Controls of variation in RGR
2) Class creates consensus model.
3) Groups evaluate the model statistically, and hand in worksheets.
4) Class reviews findings and their lessons.
C4
C3
C3