DYNAMICS OF LEAF AREA INDEX AND CANOPY OPENNESS FOR THREE FOREST COMMUNITIES IN THE WARM TEMPERATE ZONE OF CHINA

2007 ◽  
Vol 31 (3) ◽  
pp. 431-436 ◽  
Author(s):  
CHEN Sha ◽  
◽  
SANG Wei-Guo
Keyword(s):  
Leaf Area Index ◽  
Leaf Area ◽  
Temperate Zone ◽  
Canopy Openness ◽  
Forest Communities ◽  
Area Index ◽  
Warm Temperate Zone ◽  
Warm Temperate

scholarly journals Phenological patterns of defoliation and refoliation processes of rubber tree clones in the Colombian northwest

2020 ◽  
Vol 73 (3) ◽  
pp. 9293-9303
Author(s):  
Juan José Guerra-Hincapié ◽  
Óscar De Jesús Córdoba-Gaona ◽  
Juan Pablo Gil-Restrepo ◽  
Danilo Augusto Monsalve-García ◽  
Juan David Hernández-Arredondo ◽  
...  
Keyword(s):  
Principal Component Analysis ◽  
Leaf Area Index ◽  
Leaf Area ◽  
Management Strategies ◽  
Rubber Tree ◽  
Principal Component ◽  
Canopy Openness ◽  
Area Index ◽  
The Relationship ◽  
Climatic Characteristic

The knowledge of the defoliation-refoliation process in rubber cultivation allows the development of management strategies in the production system to improve rubber yield. The objective of this study was to determine the intensity and duration of defoliation-refoliation of rubber clones FX 3864, IAN 710 and IAN 873 in the municipality of Tarazá and the FX 3864 and IAN 873 clones in the municipality of Nechí (northwestern Colombia). From October 2015 to June 2016, the measurements of the necromass were carried out in each location for each clone. The light environment was quantified, employing the hemispheric photographs technique to estimate canopy openness percentage (CO) and leaf area index. The assessed weeks were grouped by Principal Component Analysis (PCA) based on the original phenology and climatic variables. The defoliation-refoliation process was analyzed descriptively using graphical representations of the trend for the phenological variables that best described this process. The relationship between climatic and phenological variables in the period evaluated was evidenced; the rainfall was the most critical climatic characteristic in the induction of the defoliation process. The leaf area index was reduced to a minimum value in February, with values of 0.52 for IAN 710 clone in Tarazá, and 0.64 for the IAN 873 clone in Nechí, which corresponded to the highest defoliation stage in both locations. The refoliation period was short (4 to 6 weeks) and occurred during the dry season for all the clones in both places.

Understanding the variability in ground-based methods for retrieving canopy openness, gap fraction, and leaf area index in diverse forest systems

2015 ◽  
Vol 205 ◽  
pp. 83-95 ◽  
Author(s):  
William Woodgate ◽  
Simon D. Jones ◽  
Lola Suarez ◽  
Michael J. Hill ◽  
John D. Armston ◽  
...  
Keyword(s):  
Leaf Area Index ◽  
Leaf Area ◽  
Canopy Openness ◽  
Area Index ◽  
Gap Fraction

Relationships between Leaf Area Index and Landsat TM Spectral Vegetation Indices across Three Temperate Zone Sites

1999 ◽  
Vol 70 (1) ◽  
pp. 52-68 ◽  
Author(s):  
David P. Turner ◽  
Warren B. Cohen ◽  
Robert E. Kennedy ◽  
Karin S. Fassnacht ◽  
John M. Briggs
Keyword(s):  
Leaf Area Index ◽  
Leaf Area ◽  
Vegetation Indices ◽  
Temperate Zone ◽  
Landsat Tm ◽  
Area Index ◽  
Spectral Vegetation Indices
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