Tree phenology and carbon dioxide fluxes - use of digital photography for process-based interpretation at the ecosystem scale

source: https://doi.org/10.7892/boris.36390 | downloaded: 31.1.2022

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2006

2005 2007

15

10

5

0

0.42

0.38

0.34

30 20 10 0 –10

GP P ( µm o l m –2 s –1 ) Te m p er at u re (° C ) Green f rac tio n P re cip ita tio n ( m m )

20

60

40

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2006

2005 2007

20 15 10 5 0

0.50

0.42

0.34

20

60 40 30

20 10 0 –10

GPP ( µm o l m –2 s –1 ) Te m p er at ur e ( °C ) Gree n f rac tio n P re cip ita tio n ( m m )

110 130 150

Day of year Day of year

220 260 300 340

0.42

0.38

0.34

0.42

0.38

0.34

0.42

0.38

0.34

0.42

0.38

0.34 0.42

0.38

0.34

0.42

0.38

0.34

2005

2006

2007

2005

2006

2007

100 75 50 25 0

0 25 50 75 100

0 25 50 75 100

0 25 50 75 100 100

75 50 25 0

100 75 50 25 0

G reen f rac tio n G reen f rac tio n

Leaf d ev el o p m en t (% ) Le af se ne sc en e ( % )

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LAE 2005

y = (− 11.3 ± 4.9) + (43.9 ± 12.3)* x R ² = 0.48, p < 0.001

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0.36 0.44 0.52

12

8

4

0

12

8

4

0

12

8

4

0 12

8

4

0

12

8

4

0

GPP ( µm o l m –2 s –1 )

Green fraction

0.36 0.44 0.52

Green fraction

0.36 0.40 0.44

0.32

0.36 0.40 0.44

0.32

0.36 0.40 0.44

0.32

Green fraction

LAE 2006

y = (− 25.4 ± 4.1) + (83.2.9 ± 10.9)* x R ² = 0.75, p < 0.001

HAI 2005

y = (− 8.5 ± 2.2) + (32.1 ± 5)* x R ² = 0.57, p < 0.001

HAI 2006

y = (− 6.9 ± 1) + (26.3 ± 2.4)* x R ² = 0.84, p < 0.001

LAE 2007

y = (− 16.7 ± 2.4) + (59.8 ± 6.2)* x R ² = 0.83, p < 0.001

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15

10

5

0

15

10

5

0

15

10

5

0

0

25

50 30

20

10

0

–10

80 120 160 200 80 120 160 200 80 120 160 200

G PP ( µm o l m –2 s –1 ) Te m p er at ur e ( °C ) P re cip ita tio n ( m m )

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Day of year

a b c

15

10

5

0

15

10

5

0

15

10

5

0

0

25

50 30

20

10

0

–10

80 120 160 200 80 120 160 200 80 120 160 200

GP P ( µm o l m –2 s –1 ) Te m p er at ur e ( °C ) P rec ip itat io n (m m )

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