Lars Eklundh
Professor
Mapping NPP for a coniferous forest in southern sweden using data from Terra/MODIS
Författare
Summary, in English
Net primary production (NPP) is modeled for a coniferous forest in southern Sweden for 2001. The model is based on the light-use efficiency concept where NPP is calculated as a product of absorbed photosynthetically active radiation (APAR) and a light-use efficiency factor (ε). APAR is estimated from the fraction of APAR (FAPAR) multiplied with the daily total amount of incoming PAR. FAPAR is obtained by linear transformation of 250 m NDVI from Terra/MODIS. Prior to the transformation, the NDVI has been seasonally adjusted by fitting local asymmetric Gauss functions to the time series. ε is modeled daily as a function of temperature, latitude and time. The model is evaluated against an NPP time series obtained from flux measurements of net ecosystem exchange (NEE) and measurements of respiration carried out simultaneously at the site (r 2 = 0.78 for modeled and measured NPP). FAPAR is evaluated against measurements 2004.
Avdelning/ar
- Institutionen för naturgeografi och ekosystemvetenskap
Publiceringsår
2005-12-01
Språk
Engelska
Dokumenttyp
Konferensbidrag
Ämne
- Physical Geography
- Remote Sensing
Nyckelord
- FAPAR
- LUE
- MODIS
- Norway spruce
- NPP
- Sweden
Conference name
31st International Symposium on Remote Sensing of Environment, ISRSE 2005: Global Monitoring for Sustainability and Security
Conference date
2005-06-20 - 2005-06-24
Conference place
St. Petersburg, Russian Federation
Status
Published