几种湿地植物根系生物量研究

根据不同植物不同时期在不同类型人工湿地中的根系生物量的测量结果,分析了湿地植物的生长状况及根系分布特点.以象草(Pennisetum purpureum)为优势种的潜流湿地比表面流湿地植物生长旺盛,在表面流湿地里象草3～5月生长旺盛,6月后出现枯萎,8月份甚至死亡;而潜流湿地的象草一直生长正常.5种湿地植物根系生物量的比较分析表明,5月份0～15cm土层的根系生物量以象草最多,其次是美人蕉(Canna indica)、香根草(Vetiveria zizanioides)、芦苇(Phragmites communis),香蒲(Typha latifolia)最少;8月份美人蕉最多,其次是象草、香根草、芦苇,香蒲最少.15cm以下则是芦苇最多,其次是香蒲、香根草、美人蕉,象草最少.根系生物量的增幅则是芦苇最快,象草最慢.

Studies on root system biomass of the plants in several kinds of wetland

The growth situation and the root system distribution characteristics of plant in the constructed wetlands were and analyzed. In the subsurface flow wetland the prior species Pennisetum purpureum grew better than in the surface flow wetland. Pennisetum purpureum in the surface flow wetland grew vigorously from March to May; began to wither in June and died in August. While its growth was normal continuously in subsurface flow wetland. In May, root system biomass of Pennisetum purpureum in the upper 15cm soil layer was the most, followed by Canna indica, Vetiveria zizanioides and Phragmites communis, while the least was Typha latifolia; but in August, the biomass of Canna indica was the most, followed by Pennisetum purpureum, Vetiveria zizanioides and Phragmitas communis, while the least was Typha latifolia. Phragmitas communis was the most below 15cm, followed by Typha latifolia, Vetiveria zizanioides and Canna indica, while the least was Pennisetum purpureum. As for the increase of root system biomass, Phragmitas communis was the quickest, and Pennisetum purpureum was the slowest.