Abstract

RINCON VELASQUEZ, Judy Andrea  and  DOTOR ROBAYO, Mónica Yadira. Effect of atmospheres modified with CO ₂ on the germination of weed seed bank. rev.udcaactual.divulg.cient. [online]. 2020, vol.23, n.1, e1551.  Epub June 30, 2020. ISSN 0123-4226.  https://doi.org/10.31910/rudca.v23.n1.2020.1551.

Increases in atmospheric carbon dioxide concentration - CO2-, can be able generate modifications on the floristic composition, biology and ecology of weeds, what can to imply modifications in their management. With the aim of recognizing the effect of CO2-modified atmospheres on germination of weed seed bank from an agricultural soil, a completely randomized experimental design was executed, which was proposed as a factorial arrangement with soil samples from 2 depths, 5 doses of CO2, 4 replicates per treatment and 3 measures repeated over time. Evaluating the effect of 5 atmospheric concentrations of CO2-400,500,700,800,900ppm-, on the germination of the seed bank. For this, pot was taken with soil samples, which were taken to confined chambers where CO2 was added up to the reference value. There they were kept under germination conditions throughout the experiment. The results indicate significant differences in the treatments in which CO2 was added, the phytosociological analyzes show that the treatment of 900ppm of CO2 presented the greatest richness and diversity according to the Shannon index (H´) and the 800ppm treatment presented the largest number of individuals. Lolium temuletum L. was the dominant species in the seed bank, showing a positive response of the species in relation to atmospheric enrichment. The results indicate CO2 enriched environments induce a variation in the population diversity of the evaluated seed bank.

Keywords : Atmospheric enrichment; biodiversity; greenhouse gases; carbon dioxide; phytosociology.

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