河岸美人蕉和香根草的生长繁育及其腐烂规律

Growth and decay patterns of riparian Canna glauca and Vetiveria zizanioides

以河岸带中的美人蕉、香根草为对象,研究了河岸带生态恢复过程中植物的生长及其作用。结果表明:美人蕉和香根草二者对水深的耐受性均不强,不适合在深水中生长与繁殖;与美人蕉相比,香根草对水深的耐受性更强;美人蕉不适合在水深>20cm的水域生长;美人蕉地上的生物量比地下高27.5%,香根草地上的生物量比地下高79%;通过收割美人蕉分别带走美人蕉所固定的全部氮、磷的59%和55%,收割香根草带走香根草所固定的全部氮和磷的57%;经过130d的浸泡,美人蕉、香根草质量损失率分别为31.89%和19.8%,全氮、全磷的损失美人蕉分别为49.43%和77.30%,香根草分别为47.54%和86.06%;植物浸泡释放有机物、氮和磷,但水中COD、NH4+-N和TP浓度并不持续增加。

The study on the growth and decay of Canna glauca and Vetiveria zizanioides in a pilot scale trial of riparian ecosystem restoration showed that both C. glauca and V. zizanioides didn＇ t have strong endurance in deep water. C. glauca did not adapt to the water body in a depth more than 20 cm, but V. zizanioides could grow in deeper water depth. The aboveground biomass of C. glauca and V. zizanioides was 27.5% and 79% more than their underground biomass, and the harvest of their aboveground biomass could remove 59% and 57% of total N and 55% and 57% of total P, respectively. After dunked in water for 130 days, the aboveground part of C. glauca lost 31.89% of its dry mass, 49.43% of total N, and 77. 30% of total P, while that of V. zizanioides lost 19. 8% of its dry mass, 47.54% of total N, and 86. 06% of total P. The dun- king of the plants induced the release of organic materials, N and P, but the concentrations of COD, NH4^＋-N and TP in water didn＇t have a persistent increase.