COPER Soil organic carbon and total nitrogen on the Herschel Island

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Soil organic carbon and total nitrogen on the Herschel Island

3rd CAPP Workshop 2014

Stockholm, 12

to 14

of May, 2014

Jaroš Obu

Hugues Lantuit, Michael Fritz, Birgit Heim, Isla Myers-Smith, Torsten Sachs, Veit Helm and Juliane Wolter

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Study area

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 Upscaling point data

SOC and TN storage

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Core locations

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Permafrost coring

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CNS and TOC analyses

 128 samples from 12 cores

 5 cm thickness on every 10 cm of core

 Analyses of Total Organic Carbon and Total Nitrogen with

combustion method

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Carbon and nitrogen contents

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Carbon and nitrogen contents

5,51

91,02

78,87

44,98

33,90 36,47 39,49

28,35

56,62

16,32

11,92

20,86

0,22

5,07 4,04 3,55 5,85

2,57 3,45 2,62 4,27

1,71 2,31 3,73

0,00 10,00 20,00 30,00 40,00 50,00 60,00 70,00 80,00 90,00 100,00

AvadlekJ01 PG2150

Guillemot PG2151

Guillemot PG2163

Herschel PG2152

Herschel PG2154

Herschel PG2155

Komakuk PG2156

Orca PG2159

Orca PG2162

Jaeger PG2157

Plover PG2158 Thrasher

kg/m2

Soil organic carbon and total nitrogen storage in 1 meter

SOC storage 1 m (kg/m2) TN storage 1 m (kg/m2)

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5,51

84,95

38,45 39,49 42,48

14,12

20,86

0,22

4,56 3,99 3,45 3,44 2,01 3,73

0,00 10,00 20,00 30,00 40,00 50,00 60,00 70,00 80,00 90,00

Spits and beaches Wet polygonal

terrain Hummocky tussock

tundra Slightly disturbed

uplands Alluvial fans Moderately

disturbed terrain Strongly disturbed terrain

kg/m2

Soil organic carbon and total nitrogen storage in 1 meter

SOC storage 1 m (kg/m2) TN storage 1 m (kg/m2)

Carbon and nitrogen contents

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Supervised classification

 21 training units

 40 ground truth points

 Maximum

likelihood

classification

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RapidEye



Horizontal

resolution 6,5 m



5 bands

440 – 510 nm (Blue) 520 – 590 nm (Green) 630 – 685 nm (Red)

690 – 730 nm (Red Edge)

760 – 850 nm (Near IR)

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Spectral differentiation

0 5 10 15 20 25 30 35

Blue Green Red Red Edge Near IR

Ra di an ce () W ·s r

·m

)

Spits and beaches Wet polygonal terrain Hummocky tussock tundra Slightly disturbed uplands Alluvial fans

Moderately disturbed terrain Strongly disturbed terrain

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Slope

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Ecological classification

 4 x 4 circle

majority filter

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Ecological classification

 75 %

agreement

between

ground truth

points and

classification

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SOC map

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TN map

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SOC and TN contents

6,0

734,1

1083,5

1382,6

53,3

340,9

262,7

0,2 39,4

112,4 120,7

4,3 48,6 46,9

0,0 200,0 400,0 600,0 800,0 1000,0 1200,0 1400,0 1600,0

Spits and beaches Wet polygonal

terrain Hummocky tussock

tundra Slightly disturbed

uplands Alluvial fans Moderately

disturbed terrain Strongly disturbed terrain

Gg

Nutrient storages on Herschel Island in 1 meter per ecological unit

SOC storage 1 m (Gg) TN storage 1 m (Gg)

There is 3,9 Tg of soil organic carbon and

0,4 Tg of total nitrogen in first meter of

soil on Herschel Island

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Drivers of differences in SOC storages

Elevation Slope Moisture NDVI Disturbance

SOC 0-100cm

r / rho -0,136 -0,676 0,686 0,226 0,568 R-squared 0,019 0,456 0,47 0,051 /

p-value 0,69 0,023 0,02 0,504 0,068

 Spits and beaches unit was excluded

 11 cores used

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Photos: M. Fritz

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Retrogressive thaw slumps

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Flume measurements on thaw slump

Photo: S. Weege

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Erosion dynamics 2012-2013

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Thank you for your attention

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Spectral differentiation

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Spectral differentiation

0 5 10 15 20 25 30 35

Blue Green Red Red Edge Near IR Slope

Ra di an ce () W ·s r

·m

) an d Slo pe (° )

Spits and beaches Wet polygonal terrain Hummocky tussock tundra Slightly disturbed uplands Alluvial fans

Moderately disturbed terrain Strongly disturbed terrain