Resilience of S.E. Asian tropical forests to disturbance
Mark Cutler & Chris Philipson (Dundee) Giles Foody, Doreen Boyd, Liam Clark & Geertje van der Heijden (Nottingham) David Burslem (Aberdeen)
3 month running mean of ERSST.v4 SST anomalies in the NiĂąo 3.4 region 2.5 2
Oceanic Nino Index (ONI)
1.5 1
0.5 0 -0.5 -1 -1.5 -2
Year
Source: nws.noaa
Critical questions Our current research programme seeks to address: – What impact does the intensity of prior disturbance and post management strategies have upon the resilience forests? – What evidence is there of the impact of the current ENSO upon forests across a disturbance gradient? – What are the most effective remote sensing tools for assessing the impacts of forest response to disturbance at local to regional scales?
• Addressed by two projects: – Spatio-TEmporal Dynamics of Forest Response to ENSO Drought (STEED) – Changing species diversity & biomass accumulation in conserved and regenerating tropical forests: 2 decades on.
Mg ha-1
Mg ha-1
In situ forest plot measurements: Change in AGB (Mg ha-1) 1996-2015
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2015
350 300 250 200 150 100 50 0 1996
2015
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ha-1
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Mg
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Mg
ha-1
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DBH classes
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>40cm 20-30cm 10-20cm
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1996
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Mg ha-1
AGB derived from allometric equations in Chave et al., 2014
150
300 200
100 0 1996
2015
2015
Research Programme • Original census of plots 1996. Re-survey 2014-16 • Revisit network of forest plots to record (in situ) changes in leaf traits, spectral response & canopy structure, mortality: – Repeated trait campaign (BALI + Oct 2016; July 2017) – Drone survey of lianas (June 2016; April 2017)
• Acquire remotely sensed data to map impacts across landscape / regional scales (pre- and post- drought) – – – –
WorldView-3 satellite imagery (11/15; 08/16; 07/17) Hyperspectral airborne imagery (10/14; 04/16??) Sentinel-2 / Landsat OLI NOAA AVHRR /MODIS regional GPP / drought index
Research Programme • Original census of plots 1996. Re-survey 2014-16 • Revisit network of forest plots to record (in situ) changes in leaf traits, spectral response & canopy structure, mortality: – Repeated trait campaign (BALI + Oct 2016; July 2017)
• Acquire remotely sensed data to map impacts across landscape / regional scales (pre- and post- drought) – Drone survey of lianas (June 2016; April 2017) – WorldView-3 satellite imagery (11/15; 08/16; 07/17)
Drone images of forest canopy at DVFC – July 2016 (Catherine Waite, UoN)
Tree census: • RAINFOR methodology • Including CII: modified form of Dawkins Index (Dawkins, 1958) Tree Crown Georeferencing: • Ipad & Bluetooth-enabled GPS/GLONASS receiver • iGIS application
November 2015
August 2016
WorldView-3 satellite imagery (colour composite) – Danum Valley
STEED Work Programme • Original census of plots 1996. Re-survey 2014-16 • Revisit network of forest plots to record (in situ) changes in leaf traits, spectral response & canopy structure, mortality: – Repeated trait campaign (BALI + Oct 2016; July 2017)
• Acquire remotely sensed data to map impacts across landscape / regional scales (pre- and post- drought) – – – – –
Drone survey of lianas (June 2016; April 2017) WorldView-3 satellite imagery (11/15; 08/16; 07/17) Hyperspectral airborne imagery (10/14; 04/16??) Sentinel-2 / Landsat OLI NOAA AVHRR /MODIS regional GPP / drought index
Progress…… • Data collection: – – – –
20 yr plot inventory completed First liana / canopy structure survey completed First leaf trait campaign completed First (of 2 more) WorldView-3 satellite images acquired
• Project blog / webpages: – https://blog.dundee.ac.uk/cechrsphere/category/steed/
Acknowledgements A big thanks to our SEARRP RA and field team
Funding from: