Seasonal Changes in Leaf Area Index and Chlorophyll in an Indian Grassland

1981 ◽  
Vol 69 (3) ◽  
pp. 797 ◽  
Author(s):  
M. K. Misra ◽  
B. N. Misra
Keyword(s):  
Leaf Area Index ◽  
Leaf Area ◽  
Seasonal Changes ◽  
Area Index

scholarly journals High NDVI and Potential Canopy Photosynthesis of South American Subtropical Forests despite Seasonal Changes in Leaf Area Index and Air Temperature

Forests ◽  
2014 ◽  
Vol 5 (2) ◽  
pp. 287-308 ◽  
Author(s):  
Piedad Cristiano ◽  
Nora Madanes ◽  
Paula Campanello ◽  
Débora di Francescantonio ◽  
Sabrina Rodríguez ◽  
...  
Keyword(s):  
Leaf Area Index ◽  
Leaf Area ◽  
Air Temperature ◽  
Seasonal Changes ◽  
South American ◽  
Canopy Photosynthesis ◽  
Area Index ◽  
Subtropical Forests

Seasonal changes of leaf area index (LAI) in a tropical deciduous forest in west Mexico

1995 ◽  
Vol 74 (1-3) ◽  
pp. 171-180 ◽  
Author(s):  
JoséManuel Maass ◽  
James M. Vose ◽  
Wayne T. Swank ◽  
Angelina Martínez-Yrízar
Keyword(s):  
Leaf Area Index ◽  
Leaf Area ◽  
Seasonal Changes ◽  
Deciduous Forest ◽  
Tropical Deciduous Forest ◽  
Area Index ◽  
West Mexico

On improving the accuracy of digital hemispherical photography measurements of seasonal leaf area index variation in deciduous broadleaf forests

2015 ◽  
Vol 45 (6) ◽  
pp. 721-731 ◽  
Author(s):  
Zhili Liu ◽  
Xingchang Wang ◽  
Jing M. Chen ◽  
Chuankuan Wang ◽  
Guangze Jin
Keyword(s):  
Leaf Area Index ◽  
Leaf Area ◽  
Seasonal Changes ◽  
Optical Methods ◽  
Hemispherical Photography ◽  
Area Index ◽  
Clumping Index ◽  
Area Variation ◽  
Major Factors

Optical methods have been widely used to estimate seasonal changes of the leaf area index (LAI) in forest stands because they are convenient and effective; however, their accuracy in deciduous broadleaf forests has rarely been evaluated. We estimate the seasonal changes in the LAI by combining periodic observations of leaf area variation with litter collection (LAIdir) in deciduous broadleaf forests and use these estimates to evaluate the accuracy of optical LAI measurements made using digital hemispherical photography (DHP). We also propose a method to correct DHP-derived LAI (LAIDHP) values for seasonal changes in major factors that influence the determination of LAI, including the woody to total area ratio (α), the element clumping index (ΩE, using three different methods), and the photographic exposure setting (E). Before these corrections were made, LAIDHP underestimates LAIdir by 14%–55% from 21 May to 1 October but overestimates it by 78% on 12 May and by 226% on 11 October. Although pronounced differences are observed between LAIdir and LAIDHP, they are significantly correlated (R2 = 0.85, RMSE = 0.32, P < 0.001). After considering seasonal changes in α, ΩE, and E, the accuracy of LAIDHP improves markedly, with a mean difference between the corrected LAIDHP and LAIdir of <17% in all periods. The results suggest that the proposed scheme for correcting LAIDHP is useful and effective for estimating seasonal LAI variation in deciduous broadleaf forests.

Sign in / Sign up

Export Citation Format

Share Document