Seed Bank via Direct Germination

Seed bank data estimated by direct germination. Seeds are allowed to germinate and the number of plants are counted and identified.

This datatable is part of the Distribution and Composition of the Seed Bank dataset. The distribution and composition of the weed seed bank in treatments 1-7 of the LTER main site is periodically (every 3-6 years) evaluated using elutriation and seed counting methods. The goal is to determine:

  1. how well the seed bank predicts weed abundances and composition in subsequent years, and
  2. how changes in disturbance (tillage) and plant species (cropping systems) affect the bank. Composite soil samples to two depths are periodically elutriated to determine seed densities, species composition, and viabilities of seven target species which are dominant on the site.

Note

Experiment: Main Cropping System Experiment (MCSE)
Data available from: May 1993 to May 2002
Dataset: KBS006
Datatable ID: KBS006-001.25
Core Areas Populations,Disturbance
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Last Updated 2017-01-26
Status
  • Completed
Variate Description Units
sample date date the sample was taken from the field
treatment treatment that the sample was drawn from
replicate replicate (block) that the sample was drawn from
station station the sample was drawn from
depth depth that was sampled in cm
cores number of soil cores taken number
sample divided Indicates if the sample was split prior to processing
surface area examined sq cm surface area that was examined in cm^2 squarecentimeters
ridge or furrow indicates if the sample came from a ridge or furrow location as indicated by 'R' and 'F' or from a mixed sample as indicated by a blank.
species species that was found
number of seeds number of seeds that were found by direct germination number
volume examined cu cm soil volume that was examined cm^3

Data Excerpt

sample_date treatment replicate station depth cores sample_divided surface_area_examined_sq_cm ridge_or_furrow species number_of_seeds volume_examined_cu_cm
2002-05-20 T1 R1 S1 0-5 cm 20 t 28.35 Digitaria sanguinalis (L.) Scop. 1 141.75
2002-05-20 T1 R1 S2 0-5 cm 20 t 28.35 Digitaria sanguinalis (L.) Scop. 1 141.75
2002-05-20 T1 R1 S2 0-5 cm 20 t 28.35 Stellaria media (L.) Vill. 1 141.75
2002-05-20 T1 R1 S2 0-5 cm 20 t 28.35 Poa compressa L. 9 141.75
2002-05-20 T1 R1 S3 0-5 cm 20 t 28.35 Digitaria sanguinalis (L.) Scop. 1 141.75
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