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Wang Q.,Chongqing University | Wang Q.,Key Laboratory of Southwest Resource Exploitation | Yuan X.-Z.,Chongqing University | Yuan X.-Z.,Key Laboratory of Southwest Resource Exploitation | And 7 more authors.
Wetland Science | Year: 2011

Common cocklebur {Xanthium sibiricum) was widely distributed in the water-level fluctuation zone of the Three Gorges Reservoir after its impoundment to 156 m in elevation. Flooding maybe accelerated the germination of common cocklebur and it was likely to be theexplanation of the phenomena. The aim of present paper was to determine the influence of water submergence on the germination of common cocklebur. The result showed that more than ninety percent of seeds even submerged in situ for even eight months were still alive. The germination rate of in situ inundated seeds at 25 °C was significantly depressed and was negatively related with submerged period. The germination rate of the seeds with bur stored in dry and airy indoor environment was not significantly different with the germination rate of seeds placed in the drawdown area with 160 m and 150 m in elevation respectively, but it was significantly lower than the germination rate of the seeds placed in the drawdown area with 170 m in elevation. All the germination indicators were significant improved after eight months' indoor submergence. Thus, it is visible that short term in situ submergence can improve germination of the seeds with burr at common temperature, while long term in situ flooding would depress germination of the seed of common cocklebur. The negative effect of flooding on germination strengthened as the prolonging of submerged periods and increasing of water depth. Source

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