Forest carbon monitoring using remote sensing and field survey in - - PowerPoint PPT Presentation

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forest carbon monitoring using remote sensing and field
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Forest carbon monitoring using remote sensing and field survey in - - PowerPoint PPT Presentation

Dec 19, 2023 198 likes •319 views

7 th GEOSS Asia-Pacific Symposium Special Session 1 Forest carbon monitoring using remote sensing and field survey in Cambodia Forestry and Forest Products Research Institute (FFPRI) Toshiya MATSUURA 1 In this presentation, Forest carbon

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Forest carbon monitoring using remote sensing and field survey in Cambodia

Forestry and Forest Products Research Institute (FFPRI)

Toshiya MATSUURA 7th GEOSS Asia-Pacific Symposium Special Session 1

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In this presentation,

Forest carbon monitoring for REDD+

  • 1. Seasonality adjustment of satellite imagery
  • 2. Recent deforestation trend after 2000s
  • 3. Carbon stock loss by land use change

(e.g., rubber plantation)

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Field survey Remote sensing

Total carbon stock = Σ ( Forest areai x Mean carbon stocki ) Mean carbon stock i Forest area i

Image classification Verification Plot survey Allometry

Decision of forest classes

Evergreen Deciduous Others

e.g. Rubber, Mangrove

Forest carbon monitoring for REDD+

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October November December January February March April

low high

NDVI

(1) Seasonal change in Cambodia (MODIS-NDVI)

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NDVI: normalized difference vegetation index

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(1) Seasonality adjustment by spectral normalization Before:

Sharp spectral change. Different range of reflectance.

After:

Similar range of reflectance within each vegetation class. Inconspicuous boundary between scenes.

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Red band NIR band Green band

Reflectance

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Langner et al. (2014) Remote Sensing of Environment, 143, 122-130.

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Cloud & shadow mask 0 20 40 km

(2) Recent deforestation after 2000s

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Chinit river basin (3,644km2)

Economic land concession (ELC)

(mainly for commercial rubber plantation)

Forest Deforested Non-Forest

2002-2006 2006-2010 2010-2013

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(2) Recent deforestation after 2000s (cont.)

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Deforested area (km2) Carbon stock change (Mt-C)

In the Chinit river basin (3,644km2)

200 400 600 800 2002-2006 2006-2010 2010-2013

  • utside ELC

ELC

100km2 200km2 About 800km2 About 6 times Doubled

(Cloud-shadow mask were excluded in 2013)

Doubled

10000 20000 30000 40000 50000 2002 2006 2010 2013 sum(F) sum(RP)

Year

Forest Rubber plantation (ELC)

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2010 10 – 2012 2012 2005 05 – 2009 2009 2000 00 – 2004 2004 1996 96 – 1999 1999 Ye Year

Distribution of ELC

(Source: Open Dev. Cambodia)

Deforestation drivers

(B) Cassava farming by locals

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5,000 10,000 15,000 20,000

2005 2007 2009 2011 2013 Wet rice Upland rice Soybean

Cassava

Eastern Kompong Thom (Kurashima, unpublished)

(A) Rubber plantation in ELC (economic land concession)

(ha)

(Cash crop for export, e.g., biofuel, feed, and food)

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(3) Carbon balance (Rubber plantation)

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Tree biomass (AGB+BGB)

y = -0.12 x2 + 13.29 x - 28.95 R² = 0.95 100 200 300 20 40 60

Time-averaged biomass (30 years for one rotation)

Rubber plantation: 140 Mg/ha Secondary forest = 270 Mg/ha −65 MgC/ha

Rubber age (years after logging) Rubber age (years after logging)

20 40 60

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5 10 15 20 25 30 35 40 45 50 55 60

Soil Organic Carbon (SOC)

−28 MgC/ha (Root) (Mg/ha) (MgC/ha)

(< 30 cm depth)

Large carbon loss (approx. 93 MgC/ha)

Litter & dead wood matters are not included.

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Summary

1.Seasonality adjustment of satellite imagery

 deciduous forest

2.Deforestation accelerated by economic development Rubber & cassava 3.Carbon loss by land use change

 Rubber plantation

Thanks for your kind attention!

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