Estimation of winter leaf area index and sky view fraction for snow modelling in boreal coniferous forests: consequences on snow mass and energy balance

2012 ◽  
pp. n/a-n/a ◽  
Author(s):  
Sirpa Rasmus ◽  
David Gustafsson ◽  
Harri Koivusalo ◽  
Ari Laurén ◽  
Achim Grelle ◽  
...  
Keyword(s):  
Energy Balance ◽  
Leaf Area Index ◽  
Leaf Area ◽  
Coniferous Forests ◽  
Area Index ◽  
Snow Mass

Leaf area index is the principal scaling parameter for both gross photosynthesis and ecosystem respiration of Northern deciduous and coniferous forests

Tellus B ◽  
2008 ◽  
Vol 60 (2) ◽  
Author(s):  
Anders Lindroth ◽  
Fredrik Lagergren ◽  
Mika Aurela ◽  
Brynhildur Bjarnadottir ◽  
Torben Christensen ◽  
...  
Keyword(s):  
Leaf Area Index ◽  
Leaf Area ◽  
Ecosystem Respiration ◽  
Coniferous Forests ◽  
Area Index ◽  
Gross Photosynthesis ◽  
Scaling Parameter

Relationship of thematic mapper simulator data to leaf area index of temperate coniferous forests

1987 ◽  
Vol 22 (3) ◽  
pp. 323-341 ◽  
Author(s):  
David L. Peterson ◽  
Michael A. Spanner ◽  
Steven W. Running ◽  
Kurt B. Teuber
Keyword(s):  
Leaf Area Index ◽  
Leaf Area ◽  
Thematic Mapper ◽  
Coniferous Forests ◽  
Area Index ◽  
Relationship Of

The seasonality of AVHRR data of temperate coniferous forests: Relationship with leaf area index

1990 ◽  
Vol 33 (2) ◽  
pp. 97-112 ◽  
Author(s):  
Michael A. Spanner ◽  
Lars L. Pierce ◽  
Steven W. Running ◽  
David L. Peterson
Keyword(s):  
Leaf Area Index ◽  
Leaf Area ◽  
Coniferous Forests ◽  
Area Index ◽  
Avhrr Data

Leaf area index is the principal scaling parameter for both gross photosynthesis and ecosystem respiration of Northern deciduous and coniferous forests

Tellus B ◽  
2008 ◽  
Vol 60 (2) ◽  
pp. 129-142 ◽  
Author(s):  
ANDERS LINDROTH ◽  
FREDRIK LAGERGREN ◽  
MIKA AURELA ◽  
BRYNHILDUR BJARNADOTTIR ◽  
TORBEN CHRISTENSEN ◽  
...  
Keyword(s):  
Leaf Area Index ◽  
Leaf Area ◽  
Ecosystem Respiration ◽  
Coniferous Forests ◽  
Area Index ◽  
Gross Photosynthesis ◽  
Scaling Parameter

Canopy transmittance models for estimating forest leaf area index

1993 ◽  
Vol 23 (12) ◽  
pp. 2579-2586 ◽  
Author(s):  
Elizabeth M. Nel ◽  
Carol A. Wessman
Keyword(s):  
Leaf Area Index ◽  
Leaf Area ◽  
Solar Zenith Angle ◽  
Coniferous Forests ◽  
Average Difference ◽  
Area Index ◽  
One Dimensional ◽  
Gap Fraction ◽  
Lambert Model

Leaf area index was estimated in old-growth and young post-fire coniferous forests in northwestern Colorado. A line quantum sensor was used to measure canopy transmittance at different solar zenith angles. Leaf area indices were estimated from canopy transmittance data according to three different models and were subsequently compared with leaf area indices derived from existing allometric equations. Of the three canopy transmittance methods evaluated, a Beer–Lambert model adjusted for diffuse light and solar zenith angle was in closest agreement with allometric leaf area index estimates (11.5% average difference), followed closely by the Beer–Lambert model (14.4% average difference). Leaf area index predicted by a one-dimensional inversion model did not agree well with allometric estimates (30.6% average difference). Differences in methods of data processing were found to have significant effects on final results. Subtraction of diffuse photosynthetically active radiation increased the leaf area indices. Calculation of leaf area index at each sampled point and determination of a final mean leaf area index approximated the allometrically derived values more closely than did derivation of leaf area index only once from an averaged gap-fraction value. Leaf area index estimates varied with sun angle.

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