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First assessment of the plant phenology index (PPI) for estimating gross primary productivity in African semi-arid ecosystems [article]

A. M. Abdi, N. Boke-Olen, H. Jin, L. Eklundh, T. Tagesson, V. Lehsten, J. Ardo
2019 arXiv   pre-print
In order to improve on existing remote-sensing based methods for estimating carbon uptake across semi-arid Africa we applied and tested the recently developed plant phenology index (PPI).  ...  The results of this study show that a PPI-based GPP model is a promising tool for the estimation of GPP in the semi-arid ecosystems of Africa.  ...  The authors would like to thank the reviewers for their time in providing detailed and constructive comments that improved the quality of the manuscript.  ... 
arXiv:1902.08058v1 fatcat:jt67qo3t3rfgtfbk3iiu7vohte

Calibrating vegetation phenology from Sentinel-2 using eddy covariance, PhenoCam, and PEP725 networks across Europe

Feng Tian, Zhanzhang Cai, Hongxiao Jin, Koen Hufkens, Helfried Scheifinger, Torbern Tagesson, Bruno Smets, Roel Van Hoolst, Kasper Bonte, Eva Ivits, Xiaoye Tong, Jonas Ardö (+1 others)
2021 Remote Sensing of Environment  
eddy covariance gross primary production (GPP), PhenoCam green chromatic coordinate (GCC), and phenology phases from the Pan-European Phenological database (PEP725).  ...  We test three vegetation indices (VI) -the normalized difference vegetation index (NDVI), the two-band enhanced vegetation index (EVI2), and the plant phenology index (PPI) -regarding their capability  ...  We acknowledge the Drought 2018 Team, ICOS Ecosystem Thematic Centre, and investigators of flux, PhenoCam, and PEP725 sites for ground data collection, processing, and coordination.  ... 
doi:10.1016/j.rse.2021.112456 fatcat:2avzelavdfdnzk3w7dkdwnq4ru

Assessment of Vegetation Trends in Drylands from Time Series of Earth Observation Data [chapter]

Rasmus Fensholt, Stephanie Horion, Torbern Tagesson, Andrea Ehammer, Kenneth Grogan, Feng Tian, Silvia Huber, Jan Verbesselt, Stephen D. Prince, Compton J. Tucker, Kjeld Rasmussen
2015 Remote Sensing Time Series  
Leinenkugel for providing the physiographic regions, the land cover dataset, and the deforestation layer of the Mekong Basin used in this research.  ...  Torsten Weber, for providing evaporation data. Acknowledgements This study was funded by the EOS-Network of the Helmholtz Centres in Germany.  ...  For example, a recently developed plant phenology index (PPI), which is linearly related to green LAI, has strong potential for more accurately mapping of vegetation phenology than the traditionally used  ... 
doi:10.1007/978-3-319-15967-6_8 fatcat:2cl5kwf33zg7hl2k3syukjpa6q

Volume 55, Number 5 (September 2002)

Editorial Board
2002 Journal of range management  
Lyons for evaluating an earlier draft of the manuscript Manuscript accepted 1 Nov. 01. Resumen Los incendios constituyeron un fenomeno natural en la  ...  Acknowledgements: Research was funded by the Texas Agricultural Experiment Station. We are grateful to D.E. Spalinger, D.E. Martin, R.  ...  -,)1100, where FVI is the Forage Value Index, BCPI is the Beef Cattle Price Index, and PPI is the Prices Paid Index.  ... 
doi:10.2458/azu_jrm_v55i5_board fatcat:h5ux35uxozbgrdirhsofawlqkq

Symposium Abstracts

1987 Journal of Psychopharmacology  
Several isolates of B. xylophilus and B. mucronatus in Japan and from some other countries were used for DNA sequencing of the ITS regions in ribosomal DNA.  ...  We hypothesised a route of geographical migration and speciation of these two nematodes by estimating the chronology of speciation.  ...  A method for comparison and quality assessment expressed in a Soil Quality Index is under development.  ... 
doi:10.1177/026988118700100110 pmid:22158754 fatcat:bptluh2vevb4ragu2y3dsm3tm4

Understanding Environmental Change and Biodiversity in a Dryland Ecosystem through Quantification of Climate Variability and Land Modification: The Case of the Dhofar

Cloud Forest, Oman, Christopher Galletti, Soe Myint
2015 unpublished
It is concluded that humans are the primary driver of environmental change.  ...  The Dhofar Cloud Forest is one of the most diverse ecosystems on the Arabian Peninsula.  ...  Shrub encroachment can have different effects on an ecosystem -it may possibly lead to both increases and decreases in primary production).  ... 


Idu, H Oamen, V Adigwe, O Erhabor
2011 Journal of Plant Development Sciences   unpublished
CCC caused reduction in plant height and number of leaves as the plant grew as well as leaf area in a concentration-dependent manner.  ...  Reduction in mitotic activity is probably responsible for the retarding effects observed.  ...  ACKNOWLEDGEMENTS The financial support by the UGC in the form of Junior Research Fellowship to Alok Kumar and grant under R & D programme by the University of Delhi are gratefully acknowledged.  ...