Influence of the Three Gorges Reservoir on the vegetation of its drawdown area: effects of water submersion and temperature on seed germination of Xanthium sibiricum (Compositae)

• Autorzy: Wang Q. , Yuan X. , Liu H.
• Języki publikacji: EN

Abstrakty

EN

Xanthium sibiricum, an annual weed, unexpectedly and dramatically occupied the exposed drawdown area after water had been impounded for the first time in the newly created Three Gorges Reservoir in China. In order to explain this phenomenon and establish an appropriate management strategy, the effects of constant submersion on seed viability and germination of X. sibiricum were investigated at two constant temperature regimes (25oC and 30oC) under artificial laboratory conditions. The results indicated that the seeds of X. sibiricum exhibited a high level of tolerance of submersion and up to 99% of seeds were viable in each treatment regime. The effect of submersion on germination was not obvious at 25oC until the submersion was prolonged for 180 days, while at 30oC the eventual germination rate of X. sibiricum, even after submergence for only one day, was significantly improved. The speed of germination was also consistently accelerated by prolonged periods of submersion. The proportion of seeds that germinated in all treatments combined was less that 56% due to seed dimorphism, thereby providing a seed bank. We conclude that the interaction between long-term winter flooding and high temperature in summer is the major reason that X. sibiricum was able to occupy the newly exposed drawdown area in the absence of competition. These findings provided further insight into how germination strategy and reservoir water-management regime contributed to this dramatic species outbreak.

Słowa kluczowe

EN

Xanthium sibiricum; Compositae; seed germination; seed viability; water submersion; temperature; Three Gorge Reservoir; China

• Wydawca: -
• Czasopismo: Polish Journal of Ecology
• Rocznik: 2014
• Tom: 62
• Numer: 1
• Opis fizyczny: p.25-36,fig.,ref.

Twórcy

autor

Wang Q.

• Key Laboratory of Freshwater Fish Reproduction and Development (Ministry of Education) and Key Laboratory of Aquatic Science of Chongqing, School of Life Science Southwest University, Chongqing 400715, China

autor

Yuan X.

• Key Laboratory of Southwest Resource Exploitation and Environmental Disaster Controlling Project of the Education Ministry, Chongqing University, Chongqing 400044, China

autor

Liu H.

• College of Resources and Environmental Science, Chongqing University, Chongqing 400044, China

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