Long-Distance and Dynamic Seed Dispersal from Horseweed (Conyza canadensis)

Jun Liu, Meilan Qi, Junming Wang

Research output: Contribution to journalArticle

Abstract

Seed dispersal has significantly contributed to horseweed invasion in ecosystems. However, there is a lack of research on long-distance (more than 1 km) and dynamic (hourly) seed movement during an entire seed-shedding season and under different atmospheric conditions. To fill this knowledge gap, the Hybrid Single-Particle Lagrangian Integrated Trajectories (HYSPLIT) model, accounting for meteorological factors and biological dynamics (hourly-order seed emission), was validated using experimental data. The validated model was run for different atmospheric conditions (wind speed and updraft-vertical turbulence) to estimate the longest distance (LD, from the source with more than 1 seed ha-1 deposition) and distribution of seed dispersal during one day (8:00 to 18:00). In a weak wind condition (1-4 m s-1 at 10 m height, standard deviation of vertical wind velocity = 0.5-0.6 m s-1), LD was about 36.5 km, and 4% of seeds were deposited farther than 5 km. In a strong wind condition (5-7 m s-1, 0.8-1 m s-1), LD was 165 km, and 27% were blown farther than 5 km. At the end of the seed-shedding season (44 days), seed dispersal exceeded 186 km; 79% were found within 5 km and 14% were blown farther than 10 km.

Original languageEnglish (US)
Pages (from-to)271-285
Number of pages15
JournalEcoscience
Volume25
Issue number3
DOIs
StatePublished - Jul 2018

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Conyza canadensis
seed dispersal
seed
seeds
wind speed
wind velocity
meteorological parameters
updraft
trajectories
turbulence
trajectory
ecosystems
ecosystem

Keywords

  • Deposition
  • horseweed
  • HYSPLIT
  • long-distance
  • seed movement

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology

Cite this

Long-Distance and Dynamic Seed Dispersal from Horseweed (Conyza canadensis). / Liu, Jun; Qi, Meilan; Wang, Junming.

In: Ecoscience, Vol. 25, No. 3, 07.2018, p. 271-285.

Research output: Contribution to journalArticle

Liu, Jun ; Qi, Meilan ; Wang, Junming. / Long-Distance and Dynamic Seed Dispersal from Horseweed (Conyza canadensis). In: Ecoscience. 2018 ; Vol. 25, No. 3. pp. 271-285.
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