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Long-term water-energy balance is a major concern in hydrology and water resource management. Evapotranspiration is a key factor for achieving water-energy balance. In this study, we used a simple water and energy balance equation to compare the effects of precipitation and potential evapotranspiration on actual evapotranspiration – mathematically and theoretically. The results showed that, in Baiyangdian...
The relationships between species richness and driving factors might vary with taxa and spatial scale. For this study we used plant species data of eight groups from nature reserves in China, namely pteridophytes, gymnosperms, angiosperms, vascular plants, Chinese endemic species, rare and endangered plants, woody plants, and herbaceous plants, and eight putative environmental predictors to explore...
Biological filter (biofilter) technology has developed rapidly and has been extensively employed to remove nitrogen pollutants originating from aquatic environments. Due to the different responses of nitrogen microorganisms to various operating parameters and environmental factors, achieving satisfactory nitrogen removal in biofilters remains a challenge. Hence, this review aims to provide useful...
A highly effective aerobic denitrification strain was screened from the municipal activated sludge and its gene sequence was obtained from DNA extraction and amplified by the polymerase chain reaction (PCR) amplification. Based on the result, the strain was preliminarily identified to be Pseudomonas by way of comparison with the National Centre for Biotechnology Information (NCBI) Genbank. In order...
Streamflow depends directly on climate conditions (e.g., precipitation and potential evapotranspiration, or Ep), which affect water balance at the basin scale. The present study was conducted to investigate the impact of climate change on streamflow in the Luan River basin, China. To assess the impact of climatic variation on streamflow, the temporal trends of streamflow were explored using the Mann-Kendall...
This research included experiments on the advanced treatment of coking wastewater by electrochemical reactor. The results showed that a favorable operating condition could be obtained through the electrochemical course, when electrolysis time was 60 min, current density was 8 A, and electrode span was 1 cm. Under this condition, total organic carbon (TOC) removal efficiency could reach 73%, and the...
We explored the possibility of using allelochemicals from terrestrial plants to solve the problem of cyanobacterial blooms in eutrophicated shallow lakes. The highly effective inhibitory allelochemicals of purslane (Portulaca oleracea L.) and purslane seeds were extracted and purified through a series of procedures, and the chemical components of the purified extracts were analyzed by gas chromatographymass...
The feasibility of total petroleum hydrocarbon-contaminated (TPH) soil remediation was studied using persulfate oxidation. Factors tested included type of activator, persulfate concentration, number of persulfate applications, and reaction time. Probe chemicals were used to study effi ciency of the persulfate oxidation mechanism. The best activation method used Fe2+, which achieved 40.8% TPH degradation...
Constructed wetlands have been the focus of increasing international interest because of their low maintenance, extent, effi ciency and eco-friendly character. However, there is a debate about the importance of vegetation for wastewater treatment in constructed wetlands. The amounts of pollutants taken up by plants are generally low. However, plants can stimulate pollutant removal by the release of...
In this research, constructed wetlands were applied to remove the nitrogen of lightly polluted wastewater from a wastewater treatment plant in Tangshan. The results showed that a favorable removal effect of nitrogen could be obtained through constructed wetland. Moreover, the aeration device added to the bottom could increase the removal rates of ammonia nitrogen in lightly polluted wastewater, but...
The Hun River Basin is one of the most important heavy industrial and agricultural production bases of China. Its pollution level has exerted negative effects on human health. In order to investigate pollution levels and estimate the cancer risk of water in the river, water samples were collected in both the flood and dry periods. Pollution indicators were detected in terms of heavy metals, polycyclic...
The Qinshui Basin in Shanxi Province in northern China is currently the largest production area of coal bed methane (CBM) in China. For this study, methane (CH₄) measurements were collected from 113 wellheads to determine primary gas leakage locations. The results indicate that the leakage is primarily from water outlets and tubing; three leakage points accounted for 95.79% of the total measured gas...
A river ecosystem is a treasure that is home to a wide variety of wetland species. The construction of bridges might have a deep impact on diversity of such an ecosystem. The ecological consequence of bridge abutments was studied by monitoring the benthic macroinvertebrate community at six main bridges on the Tuhai and Majia rivers in eastern China. We collected samples of macroinvertebrates from...
The different methyl metabolic products of inorganic arsenic lead to various toxicities. Arsenic has been demonstrated to induce hepatotoxicity by oxidative stress. The relationship between hepatic injury and inorganic methylation is not yet known. This study was designed to explore the relationship between arsenic methylation and liver oxidative stress induced by arsenic trioxide (ATO). Forty healthy...
Many studies have involved the isolation and identification of allelochemicals from aquatic plants, but the algicidal properties of terrestrial plants have received less attention. This study aims to identify allelochemicals of ethyl acetate extracts from three plant materials (shaddock peel, pomegranate peel, pomegranate seed) and to investigate their inhibitory effects on Microcystis aeruginosa...
Eutrophication of water due to pollution is one of the most serious environmental problems. The occurrence of toxic cyanobacterial blooms in eutrophic lakes, reservoirs, and recreational waters has become a worldwide problem. The inhibitory allelopathy of plants on harmful algae, which has drawn extensive attention recently, is low-cost and ecologically safe, and some good results have been reported...
The effects of species compositions (two-species mixtures or monocultures) and hydraulic retention times (HRT; 1, 4, 8, 16, 24, 48 hours) on total nitrogen (TN) and total phosphorus (TP) removal from eutrophic water were studied in a constructed wetland. Two species mixtures showed higher efficiency to remove TN and TP than monocultures. Average removal efficiency of TN and TP was 49.6% and 34.0%,...
Spatial variation of soil salinity and sodicity is a typical characteristic of Songnen Plain grasslands in northeast China. Best management practices and grassland productivity improvement require further understanding of the relationships among the causal factors at field scale. A field soil survey for the interactions among salinity, microtopography, and vegetation was conducted on a 2.8 hectare...
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