Densiometer canopy coverage estimation

Knowledge graph centered on Densiometer canopy coverage estimation with 75 nodes and 125 connections. Top connected: Rocky Mountain Biological Laboratory, Gothic, Engelmann Spruce, Populus tremuloides, Helianthella quinquenervis.

Method synopsis

Vegetation greenness assessment using Green Chromatic Coordinate as proxy for evapotranspiration rates. Calculates green reflectance normalized by total visible flux from masked vegetation areas.

Synthesized from method descriptions across 4 papers using this protocol.

Procedure from a recent peer-reviewed implementation

Steps below were extracted from the most recent peer-reviewed implementation of this protocol in the corpus — Climate and multiple dimensions of plant diversity regulate ecosystem carbon exchange along an elevational gradient (2021), Ecosphere. Implementations in other papers (listed below) may differ.

1. Measure leaf area index
   Obtained photosynthetically active radiation (PAR) measurements from above and below canopy in each plot using QSO-S PAR Photon Flux sensor (Decagon Devices, Pullman, Washington, USA). Recorded time, latitude, longitude of each sampling location and beam fractionation to estimate light attenuation through canopy. Calculated LAI using location, zenith angle, and beam fractionation for each plot.
   Quantities: PAR measurements above and below canopy for each 1 m² plotDuration: Measurements during peak growing seasonConditions: Natural light conditions during growing season
   Equipment: QSO-S PAR Photon Flux sensor, GPS for coordinates

Typical Equipment

• RGB color analysis algorithms

Output Measurements

• vegetation greenness
• greenup timing

Papers Using This Protocol (4)

Species Studied With This Protocol

Places Where Used