This page has only limited features, please log in for full access.
Wetland plants are important components in constructed wetlands (CWs), and one of their most important functions in CWs is to purify the water. However, wetland plant litter can also increase eutrophication of water via decomposition and nutrient release, and few studies have focused on the interspecific variation in the decomposition rate and nutrient release of multiple plant species in CWs. Here a greenhouse litter-bag experiment was conducted to quantify the decomposition rates and nutrient release of 7 dominant macrophytes (2 floating plants and 5 emergent plants) in three types of water substrate. The results showed that plant litter species and growth forms significantly affected the litter mass losses. The nutrient release was significantly different among plant litter species, but not between floating and emergent plants. Litter traits, such as litter lignin, total nitrogen (TN) and total phosphorus (TP) can well predict the decomposition rates of submerged litter. These results indicated that submerging litter in water did not change the relationships between litter traits and litter decomposition rates, and leaching might play a more important role in the decomposition of submerged litter in CWs than that in other terrestrial ecosystems. These findings can provide suggestions for managers about the maintenance of constructed wetlands.
Yunmei Ping; Xu Pan; Lijuan Cui; Wei Li; Yinru Lei; Jian Zhou; Jiaming Wei. Effects of Plant Growth Form and Water Substrates on the Decomposition of Submerged Litter: Evidence of Constructed Wetland Plants in a Greenhouse Experiment. Water 2017, 9, 827 .
AMA StyleYunmei Ping, Xu Pan, Lijuan Cui, Wei Li, Yinru Lei, Jian Zhou, Jiaming Wei. Effects of Plant Growth Form and Water Substrates on the Decomposition of Submerged Litter: Evidence of Constructed Wetland Plants in a Greenhouse Experiment. Water. 2017; 9 (11):827.
Chicago/Turabian StyleYunmei Ping; Xu Pan; Lijuan Cui; Wei Li; Yinru Lei; Jian Zhou; Jiaming Wei. 2017. "Effects of Plant Growth Form and Water Substrates on the Decomposition of Submerged Litter: Evidence of Constructed Wetland Plants in a Greenhouse Experiment." Water 9, no. 11: 827.
Denitrification is an important part of the nitrogen cycle and the key step to removal of nitrogen in surface-flow wetlands. Denitrifying bacteria also function in denitrification. In this study, we explored space-time analysis with high-throughput sequencing to elucidate the relationships between denitrifying bacteria community structures and environmental factors during different seasons. Our results showed that along the flow direction of different processing units, there were dynamic changes in physical and chemical indicators. The bacterial abundance indexes (ACEs) in May, August, and October were 686.8, 686.8, and 996.2, respectively, whereas the Shannon-Weiner indexes were3.718, 4.303, and 4.432, respectively. Along the flow direction, the denitrifying bacterial abundance initially increased and then decreased subsequently during the same months, although diversity tended to increase. The abundance showed similar changes during the different months. Surface flow wetlands mainly contained the following denitrifying bacteria genus: unclassified Bacteria (37.12%), unclassified Proteobacteria (18.16%), Dechloromonas (16.21%), unranked environmental samples (12.51%), unclassified Betaproteobacteria (9.73%), unclassified Rhodocyclaceae (2.14%), and Rhodanobacter (1.51%). During different seasons, the same species processing units showed alternating changes, and during the same season, bacterial community structures were influenced by the second genus proportion in different processing units. ACEs were strongly correlated with temperature, dissolved oxygen, and pH. Bacterial diversity was strongly correlated with temperature, electrical conductivity, pH, and oxidation reduction potential. All denitrifying bacterial species were greatly affected by environmental factors, including temperature and pH, and the effects of electrical conductivity and oxidation reduction potential were similar.
Jiaming Wei; Wei Li; Lijuan Cui; Yinru Lei. Denitrifying bacterial communities in surface-flow constructed wetlands during different seasons : characteristics and relationships with environment factors. 2017, 1 .
AMA StyleJiaming Wei, Wei Li, Lijuan Cui, Yinru Lei. Denitrifying bacterial communities in surface-flow constructed wetlands during different seasons : characteristics and relationships with environment factors. . 2017; ():1.
Chicago/Turabian StyleJiaming Wei; Wei Li; Lijuan Cui; Yinru Lei. 2017. "Denitrifying bacterial communities in surface-flow constructed wetlands during different seasons : characteristics and relationships with environment factors." , no. : 1.
Denitrification is an important part of the nitrogen cycle and the key step to removal of nitrogen in surface-flow wetlands. Denitrifying bacteria also function in denitrification. In this study, we explored space-time analysis with high-throughput sequencing to elucidate the relationships between denitrifying bacteria community structures and environmental factors during different seasons. Our results showed that along the flow direction of different processing units, there were dynamic changes in physical and chemical indicators. The bacterial abundance indexes (ACEs) in May, August, and October were 686.8, 686.8, and 996.2, respectively, whereas the Shannon-Weiner indexes were3.718, 4.303, and 4.432, respectively. Along the flow direction, the denitrifying bacterial abundance initially increased and then decreased subsequently during the same months, although diversity tended to increase. The abundance showed similar changes during the different months. Surface flow wetlands mainly contained the following denitrifying bacteria genus: unclassified Bacteria (37.12%), unclassified Proteobacteria (18.16%), Dechloromonas (16.21%), unranked environmental samples (12.51%), unclassified Betaproteobacteria (9.73%), unclassified Rhodocyclaceae (2.14%), and Rhodanobacter (1.51%). During different seasons, the same species processing units showed alternating changes, and during the same season, bacterial community structures were influenced by the second genus proportion in different processing units. ACEs were strongly correlated with temperature, dissolved oxygen, and pH. Bacterial diversity was strongly correlated with temperature, electrical conductivity, pH, and oxidation reduction potential. All denitrifying bacterial species were greatly affected by environmental factors, including temperature and pH, and the effects of electrical conductivity and oxidation reduction potential were similar.
Jiaming Wei; Wei Li; Lijuan Cui; Yinru Lei. Denitrifying bacterial communities in surface-flow constructed wetlands during different seasons : characteristics and relationships with environment factors. 2017, 1 .
AMA StyleJiaming Wei, Wei Li, Lijuan Cui, Yinru Lei. Denitrifying bacterial communities in surface-flow constructed wetlands during different seasons : characteristics and relationships with environment factors. . 2017; ():1.
Chicago/Turabian StyleJiaming Wei; Wei Li; Lijuan Cui; Yinru Lei. 2017. "Denitrifying bacterial communities in surface-flow constructed wetlands during different seasons : characteristics and relationships with environment factors." , no. : 1.
We monitored the water quality and hydrological conditions of a horizontal subsurface constructed wetland (HSSF-CW) in Beijing, China, for two years. We simulated the area-based constant and the temperature coefficient with the first-order kinetic model. We examined the relationships between the nitrogen (N) removal rate, N load, seasonal variations in the N removal rate, and environmental factors—such as the area-based constant, temperature, and dissolved oxygen (DO). The effluent ammonia (NH4+-N) and nitrate (NO3−-N) concentrations were significantly lower than the influent concentrations (p < 0.01, n = 38). The NO3−-N load was significantly correlated with the removal rate (R2 = 0.96, p < 0.01), but the NH4+-N load was not correlated with the removal rate (R2 = 0.02, p > 0.01). The area-based constants of NO3−-N and NH4+-N at 20 °C were 27 ± 26 (mean ± SD) and 14 ± 10 m∙year−1, respectively. The temperature coefficients for NO3−-N and NH4+-N were estimated at 1.004 and 0.960, respectively. The area-based constants for NO3−-N and NH4+-N were not correlated with temperature (p > 0.01). The NO3−-N area-based constant was correlated with the corresponding load (R2 = 0.96, p < 0.01). The NH4+-N area rate was correlated with DO (R2 = 0.69, p < 0.01), suggesting that the factors that influenced the N removal rate in this wetland met Liebig’s law of the minimum.
Lijuan Cui; Wei Li; YaQiong Zhang; Jiaming Wei; Yinru Lei; Manyin Zhang; Xu Pan; Xinsheng Zhao; Kai Li; Wu Ma. Nitrogen Removal in a Horizontal Subsurface Flow Constructed Wetland Estimated Using the First-Order Kinetic Model. Water 2016, 8, 514 .
AMA StyleLijuan Cui, Wei Li, YaQiong Zhang, Jiaming Wei, Yinru Lei, Manyin Zhang, Xu Pan, Xinsheng Zhao, Kai Li, Wu Ma. Nitrogen Removal in a Horizontal Subsurface Flow Constructed Wetland Estimated Using the First-Order Kinetic Model. Water. 2016; 8 (11):514.
Chicago/Turabian StyleLijuan Cui; Wei Li; YaQiong Zhang; Jiaming Wei; Yinru Lei; Manyin Zhang; Xu Pan; Xinsheng Zhao; Kai Li; Wu Ma. 2016. "Nitrogen Removal in a Horizontal Subsurface Flow Constructed Wetland Estimated Using the First-Order Kinetic Model." Water 8, no. 11: 514.
We monitored the water quality and hydrological conditions of a horizontal subsurface constructed wetland (HSSF-CW) in Beijing, China, for 2 years. We simulated the area rate constant and the temperature coefficient with the first-order kinetic model. We examined the relationships between the nitrogen (N) removal rate, N load, seasonal variations in the N removal rate, and environmental factors, such as the area rate constant, temperature, and dissolved oxygen (DO). The effluent ammonia (NH4+-N) and nitrate (NO3−-N) concentrations were significantly lower than the influent concentrations (p<0.01, n=38). The NO3−-N load was significantly correlated with the removal rate (R2=0.9566, p<0.01), but the NH4+-N load was not correlated with the removal rate (R2=0.0187, p>0.01). The area rate constants of NO3−-N and NH4+-N at 20 °C were 27.01±26.49 and 16.63±10.58 m∙yr−1, respectively. The temperature coefficients for NO3−-N and NH4+-N were estimated at 1.0042 and 0.9604, respectively. The area rate constants for NO3−-N and NH4+-N were not correlated with temperature (p>0.01). The NO3−-N area rate constant was correlated with the corresponding load (R2=0.9625, p<0.01). The NH4+-N area rate was correlated with DO (R2=0.6922, p<0.01), suggesting that the factors that influenced the N removal rate in this wetland met Liebig's law of the minimum.
Lijuan Cui; Wei Li; YaQiong Zhang; Jiaming Wei; Yinru Lei; Manyin Zhang; Xu Pan; Xinsheng Zhao; Kai Li; Wu Ma. Nitrogen Removal in a Horizontal Subsurface Flow Constructed Wetland Estimated Using the First-Order Kinetic Model. 2016, 1 .
AMA StyleLijuan Cui, Wei Li, YaQiong Zhang, Jiaming Wei, Yinru Lei, Manyin Zhang, Xu Pan, Xinsheng Zhao, Kai Li, Wu Ma. Nitrogen Removal in a Horizontal Subsurface Flow Constructed Wetland Estimated Using the First-Order Kinetic Model. . 2016; ():1.
Chicago/Turabian StyleLijuan Cui; Wei Li; YaQiong Zhang; Jiaming Wei; Yinru Lei; Manyin Zhang; Xu Pan; Xinsheng Zhao; Kai Li; Wu Ma. 2016. "Nitrogen Removal in a Horizontal Subsurface Flow Constructed Wetland Estimated Using the First-Order Kinetic Model." , no. : 1.