Effects of water flow on submerged macrophyte-biofilm systems in constructed wetlands

被引：48
作者：
Han, Bing [1 ]
Zhang, Songhe [1 ]
Wang, Peifang [1 ]
Wang, Chao [1 ]
机构：
[1] Hohai Univ, Coll Environm, Key Lab Integrated Regulat & Resource Dev Shallow, Minist Educ, Nanjing 210098, Jiangsu, Peoples R China
来源：
SCIENTIFIC REPORTS | 2018年 / 8卷
基金：
中国国家自然科学基金;
关键词：
BACTERIAL COMMUNITIES; BIOPHYSICAL CONTROLS; MICROBIAL BIOFILMS; SEDIMENT; VELOCITY; DYNAMICS; ARCHAEA; GROWTH; ARCHITECTURE; VEGETATION;
D O I：
10.1038/s41598-018-21080-y
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The effects of water flow on the leaf-biofilm interface of Vallisneria natans and Hydrilla verticillata were investigated using artificial plants as the control. Water flow inhibited the growth of two species of submerged macrophytes, reduced oxygen concentrations in plant leaves and changed oxygen profiles at the leaf-biofilm interface. The results from confocal laser scanning microscopy and multifractal analysis showed that water flow reduced biofilm thickness, changed biofilm topographic characterization and increased the percentages of single colony-like biofilm patches. A cluster analysis revealed that the bacterial compositions in biofilms were determined mainly by substrate types and were different from those in sediments. However, water flow increased the bacterial diversity in biofilms in terms of operational taxonomic unit numbers and Shannon Indices. Our results indicated that water flow can be used to regulate the biomass, distribution and bacterial diversities of epiphytic biofilms in constructed wetlands dominated by submerged macrophytes.
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页数：12
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