摘要
于2015年5月6日,开展模拟人工湿地实验,研究美人蕉(Canna indica)、芦苇(Phragmites australias)和香蒲(Typha orientalis)地上部分(茎、叶)和地下部分(根)枯落物的分解特征及其对人工湿地渗透系数的影响。结果表明,在枯落物分解期间,美人蕉茎、叶枯落物的分解率最大,其次为芦苇的,香蒲的最小;在分解的第302天,香蒲、美人蕉和芦苇根枯落物的分解率分别为90.6%、89.3%和73.4%,美人蕉、芦苇和香蒲茎、叶枯落物的分解率分别为93.1%、54.7%和51.4%,美人蕉茎、叶枯落物分解率高与其初始氮含量较高和木质素含量较低有关。3种水生植物枯落物的分解率与植物枯落物中的碳氮比显著负相关(p<0.01),与木质素与氮之比显著负相关(p<0.05)。与未添加水生植物枯落物的人工湿地相比,添加香蒲、美人蕉和芦苇茎、叶枯落物的人工湿地渗透系数分别下降了24.1%、16.7%和23.4%。在人工湿地中,种植木质素含量低的美人蕉,有利于缓解人工湿地堵塞。
On May 6, 2015, the decomposition characteristics of above-ground（cauline leaf） and below-ground（root） of Canna indica, Phragmites australias and Typha orientalis litters and permeability coefficient of constructed wetland were studied by using the decomposition bags and simulated constructed wetlands. The results showed that cauline leaf decomposition rate of litter of 3 aquatic plants during the whole decomposition（0-302 days） followed the order of Canna indica, Phragmites australias and Typha orientalis. The root litter decomposition rate of Typha orientalis was the highest, then Canna indica and Phragmites australias on the302 nd day, and their decomposition rates were 90.6%, 89.3% and 73.4%, respectively. The decomposition rates of cauline leaf of Canna indica, Phragmites australias and Typha orientalis on the 302 nd day were 93.1%,54.7% and 51.4%, respectively. The higher decomposition rate of Canna indica cauline leaf litter was related with the higher initial nitrogen content and lower lignin content. Aquatic plants litter decomposition rates were significantly correlated with ratio of carbon and nitrogen（p〈0.01） and lingin/N ratios（p〈0.05）. Compared with constructed wetland without litter of aquatic plants, the permeability coefficient decreased 24.1%, 16.7%and 23.4%, respectively for constructed wetland with addition of Typha orientalis, Canna indica and Phragmites australias cauline leaf litter. Therefore, the permeability coefficient could be alleviated if constructed wetland was planted aquatic plant with its lower lignin content, which could alleviate the clogging of constructed wetland.
出处
《湿地科学》
CSCD
北大核心
2017年第5期740-746,共7页
Wetland Science
基金
江苏省自然科学基金项目(BK20141477)
教育部留学回国人员科研启动基金项目(2014S048)
国家自然科学基金项目(40901257)
江苏省大学生实践创新项目(201610300037)
江苏高校"青蓝工程"项目(20161507)
江苏省"六大人才高峰"项目(JNHB-057)
江苏高校品牌专业建设工程资助项目(PPZY2015C222)资助
关键词
水生植物
枯落物
分解速率
渗透系数
aquatic plant
litter
decomposition rate
permeability coefficient
