河岸美人蕉和香根草的生长繁育及其腐烂规律

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。

Growth and decay patterns of riparian Canna glauca and Vetiveria zizanioides

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 dunking of the plants induced the release of organic materials,N and P,but the concentrations of COD,NH 4-N and TP in water didn't have a persistent increase.