Can vegetation productivity be derived from greenness in a semi-arid environment? Evidence from ground-based measurements
Abstract
Trends of biomass production and land processes in the Sahel have been widely studied since the droughts of 1970s. Satellite data have been an important source of information because of limited in situ data. Previous studies relied on the assumed existence of a relationship between vegetation productivity and the NDVI, in particular the annually integrated NDVI (iNDVI). This study examines this assumption and its limitations, based on in situ time series measurements of biomass, species composition, NDVI and soil moisture at the Dahra test site in northern Senegal. It is shown that, there are large differences between the NDVI vegetation productivity relationships, and these differences can be linked to species composition. There is moderate correlation between NDVI and above-ground net primary productivity (ANPP) at the peak season (r2 = 0.39). In particular, the species Zornia glochidiata is characterized by high peak NDVI and low ANPP, compared to other common species such as Cenchrus biflorus and Aristida adscensionis. It is concluded that spatial and temporal variations in species dominance is likely to add noise to the relationship between NDVI and biomass. However, the seasonal cyclic fraction of the NDVI small seasonal integral reduces such noise.
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Author: Laliberte, Andrea S. and Goforth, Mark A. and Steele, Caitriana M. and Rango, Albert -
Panchromatic and Multispectral Image Fusion Based on Maximization of Both Spectral and Spatial Similarities
Author: Golibagh Mahyari, Arash and Yazdi, Mehran -
Real-time retrieval of Leaf Area Index from MODIS time series data
Author: Xiao, Zhiqiang and Liang, Shunlin and Wang, Jindi and Jiang, Bo and Li, Xijia -
Utilizing space-based GPS technology to determine hydrological properties of soils
Author: Privette, Charles V. and Khalilian, Ahmad and Torres, Omar and Katzberg, Stephen -
Current Status and Future Directions of Precision Aerial Application for Site-Specific Crop Management in the USA
Author: Lan, Yubin and Thomson, Steven J. and Huang, Yanbo and Hoffmann, W. Clint and Zhang, Huihui -
Remote-Sensing Based Approach to Improve Regional Estimation of Renewable Water Resources for Sustainable Development
Author: Eugene Yan and Adam Milewski and Ahmed Abdeldayem and Farouk Soliman and Kamil Abdel Gelil -
Monitoring Maize (Zea mays L.) Phenology with Remote Sensing
Author: Viña, Andrés and Gitelson, Anatoly A. and Rundquist, Donald C. and Keydan, Galina and Leavitt, Bryan and Schepers, James - Measurement protocols
- Multispectral and panchromatic images
- Soil Moisture
- Vegetation indices