关键词: 硅, 连作, 黄瓜, 光合特性, 抗氧化酶

Abstract: Aiming at the present serious situation of soil Cd pollution in Dongting Lake wetland, this paper analyzed the Cd enrichment characteristics and remediation effects of eight dominant plant species growing in Dongting Lake area. Among the eight dominant plants, Artemisia selengensis presented a notable capacity to absorb Cd from lake soil, and had good effect in the remediation of Cd pollution, being an ideal plant for the bioremediation of Cd-polluted soil in Dongting Lake wetland. A. verlotorum had acceptable effect in the remediation of Cd pollution, being able to be selected as a potential candidate for the bioremediation of wetland soil Cd pollution. Phragmites australis and Miscanthus lutarioriparius had higher Cd accumulation in their roots, being available for the Cd enrichment, and their higher aboveground biomass, which could be harvested every year, could also play a positive role in controlling the Cd pollution in Dongting Lake wetland.

Key words: silicon, continuous cropping, cucumber, photosynthetic characteristics, antioxidant enzymes.