A model relating VHF-band backscatter to stem volume of coniferous boreal forest

2000 ◽  
Vol 38 (2) ◽  
pp. 728-740 ◽  
Author(s):  
G. Smith ◽  
L.M.H. Ulander
Keyword(s):  
Boreal Forest ◽  
Stem Volume ◽  
Coniferous Boreal Forest

scholarly journals Major postglacial summer temperature changes in the central coniferous boreal forest of Quebec (Canada) inferred using chironomid assemblages

2018 ◽  
Vol 33 (4) ◽  
pp. 409-420 ◽  
Author(s):  
Lisa Bajolle ◽  
Isabelle Larocque-Tobler ◽  
Emmanuel Gandouin ◽  
Martin Lavoie ◽  
Yves Bergeron ◽  
...  
Keyword(s):  
Boreal Forest ◽  
Summer Temperature ◽  
Temperature Changes ◽  
Chironomid Assemblages ◽  
Coniferous Boreal Forest

scholarly journals On the Sensitivity of TanDEM-X-Observations to Boreal Forest Structure

2019 ◽  
Vol 11 (14) ◽  
pp. 1644 ◽  
Author(s):  
Jan I. H. Askne ◽  
Henrik J. Persson ◽  
Lars M. H. Ulander
Keyword(s):  
Boreal Forest ◽  
Cloud Model ◽  
Tree Height ◽  
Airborne Lidar ◽  
Stem Volume ◽  
Global Dynamics ◽  
Vegetation Density ◽  
Local Data ◽  
Horizontal Structure ◽  
Model Training

The structure of forests is important to observe for understanding coupling to global dynamics of ecosystems, biodiversity, and management aspects. In this paper, the sensitivity of X-band to boreal forest stem volume and to vertical and horizontal structure in the form of forest height and horizontal vegetation density is studied using TanDEM-X satellite observations from two study sites in Sweden: Remningstorp and Krycklan. The forest was analyzed with the Interferometric Water Cloud Model (IWCM), without the use of local data for model training, and compared with measurements by Airborne Lidar Scanning (ALS). On one hand, a large number of stands were studied, and in addition, plots with different types of changes between 2010 and 2014 were also studied. It is shown that the TanDEM-X phase height is, under certain conditions, equal to the product of the ALS quantities for height and density. Therefore, the sensitivity of phase height to relative changes in height and density is the same. For stands with a phase height >5 m we obtained an root-mean-square error, RMSE, of 8% and 10% for tree height in Remningstorp and Krycklan, respectively, and for vegetation density an RMSE of 13% for both. Furthermore, we obtained an RMSE of 17% for estimation of above ground biomass at stand level in Remningstorp and in Krycklan. The forest changes estimated with TanDEM-X/IWCM and ALS are small for all plots except clear cuts but show similar trends. Plots without forest management changes show a mean estimated height growth of 2.7% with TanDEM-X/IWCM versus 2.1% with ALS and a biomass growth of 4.3% versus 4.2% per year. The agreement between the estimates from TanDEM-X/IWCM and ALS is in general good, except for stands with low phase height.

scholarly journals Seven Ways a Warming Climate Can Kill the Southern Boreal Forest

Forests ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 560
Author(s):  
Lee E. Frelich ◽  
Rebecca A. Montgomery ◽  
Peter B. Reich
Keyword(s):  
Boreal Forest ◽  
Boreal Forests ◽  
Temperate Forest ◽  
Sudden Change ◽  
Wildlife Habitat ◽  
Gradual Change ◽  
Temperate Trees ◽  
Coniferous Boreal Forest ◽  
Understory Trees ◽  
Overstory Trees

The southern boreal forests of North America are susceptible to large changes in composition as temperate forests or grasslands may replace them as the climate warms. A number of mechanisms for this have been shown to occur in recent years: (1) Gradual replacement of boreal trees by temperate trees through gap dynamics; (2) Sudden replacement of boreal overstory trees after gradual understory invasion by temperate tree species; (3) Trophic cascades causing delayed invasion by temperate species, followed by moderately sudden change from boreal to temperate forest; (4) Wind and/or hail storms removing large swaths of boreal forest and suddenly releasing temperate understory trees; (4) Compound disturbances: wind and fire combination; (5) Long, warm summers and increased drought stress; (6) Insect infestation due to lack of extreme winter cold; (7) Phenological disturbance, due to early springs, that has the potential to kill enormous swaths of coniferous boreal forest within a few years. Although most models project gradual change from boreal forest to temperate forest or savanna, most of these mechanisms have the capability to transform large swaths (size range tens to millions of square kilometers) of boreal forest to other vegetation types during the 21st century. Therefore, many surprises are likely to occur in the southern boreal forest over the next century, with major impacts on forest productivity, ecosystem services, and wildlife habitat.

scholarly journals Validation of the Integrated Biosphere Simulator over Canadian deciduous and coniferous boreal forest stands

2001 ◽  
Vol 106 (D13) ◽  
pp. 14339-14355 ◽  
Author(s):  
Mustapha El Maayar ◽  
David T. Price ◽  
Christine Delire ◽  
Jonathan A. Foley ◽  
T. Andrew Black ◽  
...  
Keyword(s):  
Boreal Forest ◽  
Forest Stands ◽  
Integrated Biosphere Simulator ◽  
Coniferous Boreal Forest

Assessment of stand‐wise stem volume retrieval in boreal forest from JERS‐1 L‐band SAR backscatter

2006 ◽  
Vol 27 (16) ◽  
pp. 3425-3454 ◽  
Author(s):  
M. Santoro ◽  
L. Eriksson ◽  
J. Askne ◽  
C. Schmullius
Keyword(s):  
Boreal Forest ◽  
Stem Volume ◽  
L Band
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