Laboratory wetland microcosms were used to study treatment of atrazine in irrigation runoff by a field-scale-constructed wetland under controlled conditions. Three experiments, in which 1 ppm atrazine was added to the water column of three wetland, one soil control, and one water control microcosm, were conducted. Atrazine dissipation from the water column and degradate formation (deethylatrazi...

Heterogeneous landscapes and fluctuating environmental conditions can affect species dispersal, population genetics, and genetic structure, yet understanding how biotic and abiotic factors affect population dynamics in a fluctuating environment is critical for species management. We evaluated how spatio-temporal habitat connectivity influences dispersal and genetic structure in a population of ...

The knowledge of selenium (Se) partitioning in treatment wetlands and wetland vegetation management are essential for long-term effective operation of constructed wetlands treating Se-laden agricultural tile-drainage in central California. In this field study, samples from different compartments of treatment wetlands were collected and the vegetation change in each wetland cell was examined fou...

Constructed wetlands could be components of low-tech systems to treat and reuse wastewater in arid region. A key function of the wetland would be to provide additional N removal. To improve design criteria, a sequential model of nitrogen transformations (organic N! ammonium; ammonium!nitrate; nitrate!nitrogen gas) was successfully calibrated and verified for a wetland in Kingman, Arizona. A seq...

Removal of mercury from municipal wastewater using a constructed wetland was studied. Wastewater, wetland plant, and sediment samples were analyzed using an advanced mercury analyzer AMA-254. Average concentrations of total mercury in inflow and outflow water were 0.157 and 0.057 μg L−1, respectively. Significant fraction of mercury (38.2 %) was removed from wastewater during pretreatment. Merc...

Grey clustering method is applies to evaluate the water eutrophication of wetland, in order to propose a superior evaluation system which is suitable for wetland eutrophication assessment. Eutrophication degree is divided into 6 classifications, and threshold of each classification makes reference to eutrophication standard of Chinese lake and eutrophication characteristics of wetland. Whiteniz...

Wetlands are recognized as one of the world’s most valuable natural resources. With the increasing world population, human demands on wetland resources for agricultural expansion and urban development continue to increase. In addition, global climate change has pronounced impacts on wetland ecosystems through alterations in hydrological regimes. To better manage and conserve wetland resources, ...

[1] Methane (CH4) emissions from wetland ecosystems in nothern high latitudes provide a potentially positive feedback to global climate warming. Large uncertainties still remain in estimating wetland CH4 emisions at regional scales. Here we develop a statistical model of CH4 emissions using an artificial neural network (ANN) approach and field observations of CH4 fluxes. Six explanatory variabl...

The ecosystem of wetlands has precious natural environment to be preserved in the world. In order to sustain valuable wetlands ecosystems for a long time, it is very important to frequently monitor the state of wetland ecosystems, to carefully watch the environment, and to earlier warn the environmental change. In this research, using high spatial resolution of color photographs taken with a 35...

An annual study of a natural wetland receiving drainage with high concentrations of iron, zinc, and manganese from an abandoned mine tunnel was conducted. During summer, the wetland reduced the mass flow from the tunnel to a receiving stream by more than 90% for iron, by 65% for zinc, and by 25% for manganese. Plant uptake accounted for less than 1% of the total retention. Zinc and manganese ma...