Grid-based root presence-absence quantification from soil pit photographs (Plantae)

Knowledge graph centered on Grid-based root presence-absence quantification from soil pit photographs (Plantae) with 70 nodes and 146 connections. Top connected: elevational gradients, Lupinus, woody stems, browse, carbon cycling.

Method synopsis

Photographs of soil pit faces are overlaid with 1×1 cm grids to systematically score presence or absence of fine and coarse roots in each grid cell, providing depth-resolved estimates of root spatial distribution.

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 — Depth of nutrient uptake by deep-rooted plants is regulated by water availability (2026), PNAS. Implementations in other papers (listed below) may differ.

1. X-ray tomography of root systems
   Sagebrush and lupine taproots were observed growing into fractured shale saprolite at approximately 1 m depth. Root samples were embedded in two-component epoxy and scanned using GE Lightspeed 16 medical computed tomography scanner. CT scans were performed at 120 kV and 160 mA at voxel size of 400 × 400 × 625 μm.
   Quantities: Multiple root samples from 2 speciesDuration: Individual scan sessionsConditions: Medical CT scanner facility
   Equipment: GE Lightspeed 16 CT scanner, two-component epoxy

Typical Equipment

• camera
• measuring tapes
• image analysis software
• computers

Output Measurements

• root presence-absence by depth
• fraction of soil area containing roots

Papers Using This Protocol (4)

Species Studied With This Protocol

Places Where Used