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Patterns in CO 2 gas exchange capacity of grassland ecosystems in the Alps. Yue-Lin Li, J. Tenhunen, K. Owen, M. Schmitt, M. Bahn, M. Droesler, D. Otieno, M. Schmidt, Th. Gruenwald, M.Z. Hussain, H. Mirzae, Ch. Bernhofer Department of Plant Ecology, University of Bayreuth, Germany

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Patterns in CO 2 gas exchange capacity of grassland ecosystems in the Alps

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Patterns in CO2 gas exchange capacity of

grassland ecosystems in the Alps

Yue-Lin Li, J. Tenhunen, K. Owen, M. Schmitt, M. Bahn,

M. Droesler, D. Otieno, M. Schmidt, Th. Gruenwald,

M.Z. Hussain, H. Mirzae, Ch. Bernhofer

Department of Plant Ecology, University of Bayreuth, Germany

Institute of Ecology, University of Innsbruck, Austria

IHM-Meteorology, University of Dresden, Germany


A: Berchtesgaden Locations

S

N

Y3

Y2

Y1

Y0

Stubai Valley:

Y0 Intensive Meadow 1000 m

Y1 Extensive Meadow 1750 m

Y2 Pasture 1950 m

Y3Abandoned 1960m

S

X3

X2

X1

N

X0

Berchtesgaden National Park:

X0 Schönau, Intensive Meadow 620 m

X1 Hirschengarten, Pasture 1020 m

X2 Kühroint, Pasture 1420 m

X3 Kederbichl, Forest Understory 1750 m

Fig.1

B: Stubai Valley Locations


2000


Low elevation sites

High elevation sites


10

y = 0.93 x

2

R

= 0.59

0

-30

-20

-10

0

10

-10

-20

Grillenburg

Estimated

-10

-5

0

-30

0

Actual

-5

-10

y = 0.96 x

R

2

= 0.43

2004

NEE estimated, mmol CO2 m-2 s-1

Day of Year

NEE measured, mmol CO2 m-2 s-1

0

60

120

180

240

300

360

2004

4

2

0

-2

Carbon Gain in Light Period, g C m-2 d-1

-4

-6

-8

-10


Separation of CO2 exchange by components

of a herbaceous vegetation mosaic and up-scaling

via chamber plus eddy covariance measurements

in the Portuguese montado

John Tenhunen, Yuelin Li, Heydar Mirzaei, Mir Zaman Hussain

Department of Plant Ecology, University of Bayreuth, Germany

Lukas Siebicke, Thomas Foken

Department of Micrometeorology, University of Bayreuth, Germany

Joao Banza, Joao Pereira

Instituto Superior de Agronomia, Technical University of Lisbon, Portugal

Luis Aires, Casimiro Pio

CESAM and Department of Environment, University of Aveiro, Portugal


H

100

H

m

U

Ca.

B

L

A

C

E


Empirical Canopy Model:

Canopy Fixation Capacity

Light Use Efficiency

Ecosystem Respiration Capacity

Soil

Influence

Day of Year

200x?

FLUXNET

Soil

Matric potential (cm)

-45

2003

-55

-65

Day of Year

-75

-85

60

120

180

240

300

360

0

Climate

NDVI (for LAI)

Management?

Crops and Grasslands


Croplands


Grasslands


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