scholarly journals Vertical heterogeneity in predation pressure in a temperate forest canopy

PeerJ ◽  
2013 ◽  
Vol 1 ◽  
pp. e138 ◽  
Author(s):  
Kathleen R. Aikens ◽  
Laura L. Timms ◽  
Christopher M. Buddle
Keyword(s):  
Temperate Forest ◽  
Forest Canopy ◽  
Predation Pressure ◽  
Vertical Heterogeneity

scholarly journals Spatial Variation in Canopy Structure across Forest Landscapes

2018 ◽  
Author(s):  
Brady S. Hardiman ◽  
Elizabeth A. LaRue ◽  
Jeff W. Atkins ◽  
Robert T. Fahey ◽  
Franklin W. Wagner ◽  
...  
Keyword(s):  
Temperate Forest ◽  
Forest Canopy ◽  
Spatial Scales ◽  
Canopy Structure ◽  
Ecosystem Functions ◽  
Lidar System ◽  
Stable Point ◽  
Eastern Usa ◽  
Forested Landscapes ◽  
Patch Scale

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.

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

2016 ◽  
Vol 4 (9) ◽  
pp. 1 ◽  
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.

Drought acclimation of two deciduous tree species of different layers in a temperate forest canopy

Trees ◽  
2004 ◽  
Vol 18 (1) ◽  
pp. 93-101 ◽  
Author(s):  
Wolfram Hartung ◽  
�lo Niinemets ◽  
Kr��t Aasamaa ◽  
Anu S�ber
Keyword(s):  
Tree Species ◽  
Temperate Forest ◽  
Forest Canopy ◽  
Deciduous Tree ◽  
Drought Acclimation

Assessment of trends in predation pressure on insects across temperate forest microhabitats

2013 ◽  
Vol 15 (3) ◽  
pp. 255-261 ◽  
Author(s):  
Jan Šipoš ◽  
Michaela Drozdová ◽  
Pavel Drozd
Keyword(s):  
Temperate Forest ◽  
Predation Pressure

scholarly journals UPSCALING OF SOLAR INDUCED CHLOROPHYLL FLUORESCENCE FROM LEAF TO CANOPY USING THE DART MODEL AND A REALISTIC 3D FOREST SCENE

2017 ◽  
Vol XLII-3/W3 ◽  
pp. 107-111 ◽  
Author(s):  
W. Liu ◽  
J. Atherton ◽  
M. Mõttus ◽  
A. MacArthur ◽  
H. Teemu ◽  
...  
Keyword(s):  
Radiative Transfer ◽  
Forest Canopy ◽  
Multiple Scales ◽  
Canopy Structure ◽  
Radiative Transfer Model ◽  
Transfer Model ◽  
Fluorescence Signal ◽  
Forest Canopies ◽  
Vertical Heterogeneity ◽  
Leaf Level

Solar induced chlorophyll a fluorescence (SIF) has been shown to be an excellent proxy of photosynthesis at multiple scales. However, the mechanical linkages between fluorescence and photosynthesis at the leaf level cannot be directly applied at canopy or field scales, as the larger scale SIF emission depends on canopy structure. This is especially true for the forest canopies characterized by high horizontal and vertical heterogeneity. While most of the current studies on SIF radiative transfer in plant canopies are based on the assumption of a homogeneous canopy, recently codes have been developed capable of simulation of fluorescence signal in explicit 3-D forest canopies. Here we present a canopy SIF upscaling method consisting of the integration of the 3-D radiative transfer model DART and a 3-D object model BLENDER. Our aim was to better understand the effect of boreal forest canopy structure on SIF for a spatially explicit forest canopy.

scholarly journals Increases in atmospheric CO2 have little influence on transpiration of a temperate forest canopy

2014 ◽  
Vol 205 (2) ◽  
pp. 518-525 ◽  
Author(s):  
Pantana Tor-ngern ◽  
Ram Oren ◽  
Eric J. Ward ◽  
Sari Palmroth ◽  
Heather R. McCarthy ◽  
...  
Keyword(s):  
Temperate Forest ◽  
Forest Canopy ◽  
Atmospheric Co2

SMAP Validation Experiment 2019–2022 (SMAPVEX19-22): Detection of Soil Moisture Under Temperate Forest Canopy

2021 ◽  
Author(s):  
Andreas Colliander ◽  
Michael H. Cosh ◽  
Sidharth Misra ◽  
Laura Bourgeau-Chavez ◽  
Vicky Kelly ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Temperate Forest ◽  
Forest Canopy ◽  
Validation Experiment
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