Abstract
Soil‐buried seeds of barnyardgrass ( Echinochloa crus‐galli var. crus‐galli ) germinated from April to June in three intermittent flushes. The later two flushes of germination occurred after heavy rainfall. Carbon dioxide concentration in soil air transiently increased to 30 dm 3 m –3 after the rainfall, probably due to the increase in soil temperature and water potential. Germination of exhumed seeds was stimulated by exposure to CO 2 at 30 dm 3 m –3 . Fluctuating temperature, light, water, ethylene, and nitrate are known to promote seed germination in many species. However, of these environmental factors, within ranges found in the field, only CO 2 was effective in enhancing the germination of barnyardgrass seeds. We conclude that soil CO 2 is responsible for causing intermittent flushes of germination. Detection of vegetation gaps may be explained by the responsiveness of buried seeds to CO 2 .
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Claims 6
Claim · model-written summary
Buried barnyardgrass seeds germinated in three intermittent flushes from April to June.
- Taxon
- barnyardgrass
Echinochloa crus-gallie0 - Organ / stage
- Soil‐buried seedse0
- Outcome
- germinatede0
- Value
- three intermittent flushese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil‐buried seeds of barnyardgrass ( Echinochloa crus‐galli var. crus‐galli ) germinated from April to June in three intermittent flushes.”
Claim · model-written summary
The later two germination flushes followed heavy rainfall.
Not reportedTaxonSettingDirection
Verbatim
e0“The later two flushes of germination occurred after heavy rainfall.”
Claim · model-written summary
Soil-air carbon dioxide transiently increased to 30 dm 3 m –3 after rainfall.
Not reportedTaxon
Verbatim
e0“Carbon dioxide concentration in soil air transiently increased to 30 dm 3 m –3 after the rainfall”
Claim · model-written summary
Exposure to carbon dioxide stimulated exhumed seed germination.
- Treatment
- exposure to CO 2 at 30 dm 3 m –3e0
- Outcome
- Germination of exhumed seedse0
- Direction
- stimulatede0
Not reportedTaxonComparator
Verbatim
e0“Germination of exhumed seeds was stimulated by exposure to CO 2 at 30 dm 3 m –3 .”
Claim · model-written summary
Among tested environmental factors, only carbon dioxide enhanced barnyardgrass seed germination.
- Taxon
- barnyardgrassEchinochloa crus-gallie0
- Treatment
- CO 2e0
- Outcome
- germination of barnyardgrass seedse0
- Direction
- enhancinge0
- Qualifier
- within ranges found in the fielde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“within ranges found in the field, only CO 2 was effective in enhancing the germination of barnyardgrass seeds.”
Claim · model-written summary
The authors conclude that soil carbon dioxide causes intermittent germination flushes.
Not reportedTaxon
Verbatim
e0“We conclude that soil CO 2 is responsible for causing intermittent flushes of germination.”
The same questions in other papers
co2 · growth · Echinochloa crus-galli (barnyard grass)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction · 1 reporting no difference from an alternative
- positive
- negative
- no effect
1 paper more in this group
See all 5 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.