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Terahertz anomalous dispersion and material physical properties leads to form the region with negative dielectric permittivity (DP) that is created around the polar frequency oscillations in three crystalline modifications of boron nitride will be analyzed in our report. Our analysis based on the simple quantitative criterion of existence the negative DP bands. Seven vibrations in different crystalline...
Soil and water loss is an important source of water eutrophication. In this study, soil erosion were measured in the four types of cultivated lands (Paddy land, Terraced farmland, Sloping farmlands <; 25°, and Sloping farmlands ≥ 25°) in Xiaojiang River basin, Chongqing of China. In addition, water qualities were investigated in 5 reaches of Xiaojiang River (Qukou, Yanglu, Gaoyang, Huangshi, and...
The increasing pollution load played a key role in the water quality deterioration and eutrophication of Lake Dianshan. The results of pollution surveys of 1985, 1995 and 2006 showed that the inputs of nitrogen and phosphorus from upper stream origin from Lake Taihu were up to 7565.0 t and 401.0 t in 2006, respectively, accounting for more than 90% of the sum; nitrogen input from non-point source...
Marine environment is an important component of natural environment. It is a basic guarantee to realize the sustainable development of marine economy. The increasing marine environmental pollution causes many bad results. The paper selected the contents of inorganic nitrogen, activated phosphate, oil, mercury (Hg), lead (Pb), arsenic (As) and copper (Cu) as evaluation indexes. Then it established...
A pilot scale constructed wetland was setup for the studies of removal efficiency of nitrogen from treated municipal wastewater using various filter media and a macrophyte. For the current research work pulverized fly ash bricks, shale and gravel media were used and a macrophyte Phragmites was chosen to find out the removal efficiency with various filter media. In this study, four constructed wetlands...
GIS and the fundamentals and methods of geostatistics were applied to regionalize the spatial distribution pattern of Available Potassium, Available Phosphorus, Available Nitrogen and Organic Matter in Jinghe Basin. The results showed that: 1 It is clearly founded that the spatial heterogeneity of the soil available nutrient in Jinghe basin, and the human activities had seriously impacted on the spatial...
Wheat is one of the most important crops in the world. So the safety of wheat product is essential to people's health. With imitating experiment of arsenic polluted soil in pots, effects of nitrogen and phosphorus fertilizers on yield and quality characters of wheat were studied, and arsenic contents of wheat root, stem, grain and soil were determined detailedly. The effective measures by adding nitrogen...
The influence of land use on water quality was studied in both buffer zones and watershed. Total nitrogen, total phosphorus and chemical oxygen demand were selected to represent water quality. Alos images and DEM was used to gain the land use map and watershed boundary. Redundancy analysis was used to analyze the relationship of land use to water quality. The results indicated that the land use of...
Agricultural Non-point Sources Pollution is one of a leading cause of water quality problems in southeast of China. It is an effective approach for ANSP control that modeling nitrogen and phosphorus transfer in a basin system by using mathematic models based on geographic processes. In this paper, the multi-scale integrating distributed modeling frame was designed based on different spatial discretization...
Recent studies have shown that there is a high correlation between canopy nitrogen and NIR reflectance and subsequently canopy albedo. We provide a physical explanation for the correlation using the spectral invariants of the radiative transfer. The spectral invariant approach allows for a very accurate parameterization of the canopy reflectance in terms of the wavelength dependant single scattering...
The aim of the study was to test the potentiality of field close-range hyperspectral images to obtain nitrogen content of wheat leaves in field. Field measurements imply several potential disturbances of the recorded signal: illumination level, specular reflection, multiple reflections, etc. Chemo-metrical model calibration procedure has to take them into account. We tested the following methodology...
The purpose of this work is to examine the effect of elevated carbon dioxide (CO2) and the relationship with wetland plant species in shallow lake wetlands in the East China. The wetland plant species such as Potamogeton crispun, Water hyacinth and Water iris were grown under two levels of CO2 in ambient and elevated (ambient CO2 + 200 μL L-1) respectively. They are grown in three replicated rooms,...
Nutrient has been considered to be undoubtedly one of the key factors stimulating algae growth. By a series of experiments the relationship between nutrient elements and phytoplankton growth was explored in three lakes: Lake Yezhihu, Lake Tangxunhu and Lake Nanhu, located in Wuhan City, China. We undertook 5 days in-site incubation experiments in the late April, 2007. The results showed that the chlorophyll...
A full-scale SBR system was built to investigate simultaneous nitrogen and phosphorus removal from municipal wastewater. The system was operated for 290 days and achieved stable organic and nutrient treatment effects. Removal efficiency of COD, TP, NH4+-N and TN reached 90.1%, 89.3% 87.3% and 60.2% respectively. To optimize system operation, different reactor operation conditions were analyzed. The...
In order to obtain a higher glutathione (GSH) production, the original strain of S. cerevisiae BY-14 was mutated with N+ implantation (10 keV, 60×1014 ions/cm2) , and an ethionine-resistant mutant BL-23 was obtained. The mutant showed GSH production increased from 58.79 mg/l to 113.46 mg/l, and content increased from 14.17 mg/g dry cell weight to 20.86 mg/g dry cell weight. The mutant BL-23 is stable...
The effect of irrigation of municipal reclaimed wastewater on soil microbial properties in Bei Yechang irrigation area was studied. Reclaimed wastewater irrigation and freshwater is similar to a certain extent can increase the microbial biomass carbon (MBC) under different treatments, rotation treatment increase significantly among these treatments, and almost close to CK. Soil respiration highly...
This essay tries to research into the existing form of the nutritious elements in lake water-nitrogen and phosphorus with geochemical theories, views and knowledge by analyzing the space-time distribution feature of Wuliangsuhai Lake nutritious elements-nitrogen and phosphorus and its geochemistry environment under different pH values, temperature and pE values.
An aerobic denitrifier (X31) derived from sewage sludge has been used for the biological denitrification under aerobic environment. 16S rDNA sequencing indicates X31 is a stain of Pseudomonas sp. Succinate was used as the carbon source for X31 aerobic denitrification. Results showed that over 97% denitrification rate was achieved when succinate was applied. When the initial COD/N ratio was adjusted...
In view of the problem that the high concentration of nitrogen and phosphate remained in secondary effluent, adsorption processes were attempted to remove nitrogen and phosphate. In this paper, nature zeolite was modified and compounded as a matrix material. After treating in these methods, the properties of zeolite had been greatly improved and the goal of nitrogen and phosphate synchronous removal...
Rainout shelters and irrigation systems were manipulated in a Mongolian pine plantations to simulate changes in precipitation amount and to explore how it would affect soil N availability in in Keerqin Sandy lands. Both reduced (RP) and increased (IP) precipitation treatments significantly affected soil inorganic N concentration, increasing it through the growing season except in September under RP...
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