Analysis of hyperspectral data for estimation of temperate forest canopy nitrogen concentration: comparison between an airborne (aviris) and a spaceborne (hyperion) sensor

Forest canopy structure (CS) controls many ecosystem functions and is highly variable across landscapes, but the magnitude and scale of this variation is not well understood. We used a portable canopy lidar system to characterize variation in five categories of CS along N = 3 transects (140–800 m long) at each of six forested landscapes within the eastern USA. The cumulative coefficient of variation was calculated for subsegments of each transect to determine the point of stability for individual CS metrics. We then quantified the scale at which CS is autocorrelated using Moran’s I in an Incremental Autocorrelation analysis. All CS metrics reached stable values within 300 m but varied substantially within and among forested landscapes. A stable point of 300 m for CS metrics corresponds with the spatial extent that many ecosystem functions are measured and modeled. Additionally, CS metrics were spatially autocorrelated at 40 to 88 m, suggesting that patch scale disturbance or environmental factors drive these patterns. Our study shows CS is heterogeneous across temperate forest landscapes at the scale of 10’s of meters, requiring a resolution of this size for upscaling CS with remote sensing to large spatial scales.

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Mapping forest canopy nitrogen content by inversion of coupled leaf-canopy radiative transfer models from airborne hyperspectral imagery

Agricultural and Forest Meteorology ◽

10.1016/j.agrformet.2018.02.010 ◽

2018 ◽

Vol 253-254 ◽

pp. 247-260 ◽

Cited By ~ 25

Author(s):

Zhihui Wang ◽

Andrew K. Skidmore ◽

Roshanak Darvishzadeh ◽

Tiejun Wang

Keyword(s):

Radiative Transfer ◽

Nitrogen Content ◽

Forest Canopy ◽

Hyperspectral Imagery ◽

Radiative Transfer Models ◽

Canopy Nitrogen ◽

Leaf Canopy ◽

Transfer Models

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Canopy carbon and o×ygen isotope composition of 9-year-old hoop pine families in relation to seedling carbon isotope composition, growth, field growth performance, and canopy nitrogen concentration

Canadian Journal of Forest Research ◽

10.1139/cjfr-31-4-673 ◽

2001 ◽

Vol 31 (4) ◽

pp. 673-681 ◽

Cited By ~ 2

Author(s):

Nina V. Prasolova ◽

Zhihong Xu ◽

Graham D. Farquhar ◽

Paul G. Saffigna ◽

Mark J. Dieters

Keyword(s):

Growth Performance ◽

Carbon Isotope ◽

Isotope Composition ◽

Nitrogen Concentration ◽

Carbon Isotope Composition ◽

Field Growth ◽

Hoop Pine ◽

Canopy Nitrogen

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Upper canopy pollinators of Eucryphia cordifolia Cav., a tree of South American temperate rain forest

Journal of Insect Biodiversity ◽

10.12976/jib/2016.4.9 ◽

2016 ◽

Vol 4 (9) ◽

pp. 1 ◽

Cited By ~ 2

Author(s):

Cecilia Smith-Ramírez ◽

Paula Martínez ◽

Iván Díaz ◽

Marcelo Galaz ◽

Juan J. Armesto

Keyword(s):

Rain Forest ◽

Temperate Forest ◽

Forest Canopy ◽

Forest Understory ◽

South American ◽

Ecological Processes ◽

Flower Visitors ◽

Temperate Rain Forest ◽

Tall Tree ◽

Pollinator Assemblage

Ecological processes in the upper canopy of temperate forests have been seldom studied because of the limited accessibility. Here, we present the results of the first survey of the pollinator assemblage and the frequency of insect visits to flowers in the upper branches of ulmo, Eucryphia cordifolia Cav., an emergent 30-40 m-tall tree in rainforests of Chiloé Island, Chile. We compared these findings with a survey of flower visitors restricted to lower branches of E. cordifolia 1- in the forest understory, 2- in lower branches in an agroforestry area. We found 10 species of pollinators in canopy, and eight, 12 and 15 species in understory, depending of tree locations. The main pollinators of E. cordifolia in the upper canopy differed significantly from the pollinator assemblage recorded in lower tree branches. We conclude that the pollinator assemblages of the temperate forest canopy and interior are still unknown.

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