Advanced Materials Research Vols. 807-809

Abstract: Frequent spring blooms have been observed in Xiangxi Bay (XXB) at Three Gorges Reservoir (TGR) since its initial filling. To identify the primary factor controlling spring blooms, in the spring of 2010 and 2011, a field monitoring plan was carried out in the area (XX) where serious blooms outbroke in XXB The environmental factors which includes Chlorophyll a (Chl-a), nutrients, water temperature, secchi depth, etc. were involved. According the comparative analysis on the environmental factors of spring 2010 and 2011 in XXB, We study the relationship between water temperature and Chl-a. The results show that the spring blooms in 2010 is earlier than that in 2011. Comparative analysis on water temperature in the two years showed that surface temperature in spring 2010 continued to rise earlier than in 2011, and also the time that surface temperature continued to rise is the same to the time Chl-a concentrations increased. When the total nitrogen (TN) concentrations decreased, relative water column stability increased, and the time that mixing depth (Z_mix) decreased were the same to the time when the surface temperature continued to rise. While the Water temperature increased, utilization of algal on nutrient , promoted development of thermal stratification, Increase of relative water column stability, and the sudden decrease of mixing depth resulted in the blooms. Rising surface temperature continued to rise was one of the primary induction factors to the spring blooms in XXB.

Abstract: Phytoremediation is the most commonly selected option for decontaminating the nutrients in eutrophic water bodies in recent years. In the present study, the effects of pH and illumination time on removing nitrogen and phosphorus by purple-root water hyacinth were investigated. The results indicate that there would be a better removal rates of nitrogen and phosphorus under the condition of pH=6~7 and t=8~10 h. Both acid and alkali conditions would slow down the purification effects and increasing illumination time can not improve the removal rate remarkablely. Therefore, it provides an important theoretical foundation for the efficient use of purple-root water hyacinth to restore eutrophic water bodies.

Abstract: It was investigated and analyzed about the species composition of phytoplankton, and their relations to environmental factors sampled in spring, summer and autumn in 2001-2011 in Fuxian Lake (24o 21'~24o 38' N, 102o 49'12 "~102o 57'26"E). The phytoplankton from Fuxian lake included 78 species belong to 41 genera 25 family, 7 phyla. Chlorophyta was predominant, with consisted of 43.5% of total species number. Species number of phytoplankton appeared visible monthly variation. The main predominant phytoplankton species was Mougeotia bloodlei, which accounted for 42.94%~84.94% of total cell density of phytoplankton. The community structures of phytoplankton were consist of Mougeotia bloodlei, Chroococcus spp., Cyclotella spp., Ceratium hirundinella and Dinobryon sertularia.

Abstract: The soil samples along the Xiangxi River bank in the Three Gorges Reservoir were collected at exposed period. The total phosphorus and inorganic phosphorus contents in soil were determined, and their distribution characteristics were analyzed. The results show that the average content of TP is 1.0735gkg^-1 (145-175m) and 1.225gkg^-1 (175-185m) respectively. The downstream and upstream has the maximum and minimum values respectively. Ca-P and O-P are the major IP forms of Xiangxi River riparian zone. The midstream and upstream (145-175m) has the maximum and minimum content of Al-P and Fe-P respectively, while the downstream (175-185m) has maximum content of Al-P and Fe-P respectively. The downstream (145-185m) has minimum content, while the upstream and midstream has the maximum content of WS-P and O-P respectively. The upstream and downstream (145-185m) has the maximum and minimum content of Ca-P respectively. The bio-available phosphorus content decreased gradually and bio-unavailable phosphorus content increased gradually from downstream to upstream.

Abstract: Wetland science research has earned great attentions and wetland assessment is an important part of wetland science characterized by complex context and various assessment methods. What's more, there is not unified standard on the evaluation of wetland functions. This paper enumerates the commonly used evaluation methods for different functions of wetland both at home and abroad. The advantages, disadvantages, application range of each method and relevant outcomes were discussed, which can provide a reference for the wetland assessment in our country.

Abstract: Vegetation in coastal parks is more sensitive and fragile to subsoil salinity. 600 subsoil samples in a newly-developed coastal park and 1800 subsoil samples in three old non-coastal parks in Shanghai, China were collected. The subsoil salinity of coastal park is 4.83 times higher than that of non-coastal parks. The average subsoil salinities in Spring and Winter are higher than that in Summer and Autumn. Collaborative vertical trend of subsoil salinity for four seasons is significant (p<0.05). Therefore, the ditches should be adjusted for salt elimination according to location of highly saline plaques, and seepage interception projects should be set up between green-space and unimproved land and the vegetation should be watered more frequently in Spring than that in other seasons.

Abstract: Soil moisture sensor probe is the basic and key part of the automated water-saving irrigation equipment. It can measure soil moisture accurately and in real-timely, while metal probes have a serious problem of corrosion and passivation as working in the soil which is a severe environment of the soil of high humidity and complex chemical compositions. Graphite gelling of different content of graphite composite material under both wet and dry conditions, the experimental study, by testing the experimental data of its resistivity contrast to identify the proportion of the composite material of graphite content suitable for the production of a new probe.

Abstract: The provincial rural tourism in Zhejiang is still on a developing and lifting stage. There are also many problems which need to carry on technological innovation. The article mainly studies technical innovation on rural tourism, taking Baisha village as a typical case and conducts a in-depth investigation on the three aspects of rural tourism technical innovation, namely, products innovation, management and service innovation, and marketing innovation. After that, the author proposes some counter measures to provide references to develop rural tourism in other similar areas.

Abstract: Many State Grid projects of China are facing a series of natural disaster threats, such as landslide, collapse, mud-rock slide, etc. This article takes the Huangshi Daye Steel Substation as research object. Based on the orthogonal test which confirmed factors influencing the stability, it adopts the Numerical Simulation Method and the Roof Thickness-to-span Ratio Method to evaluate the stability of the Huangshi Daye Steel Substations karst foundation. By doing this, karst foundation stability maps of the substation are respectively obtained. Analyzing the stability results of the two methods, it has been found that the stability evaluation results measured by the two methods are the same. And orthogonal test has advantages such as comprehensiveness, speediness, reliability and accuracy. Meanwhile, according to the stability evaluation results, specific site operation suggestions are proposed.

Abstract: The waterfront development in China faces the problems of landscape, ecology and sustainability. According to the research of the waterfront park in the North Bund of Shanghai, this paper discusses the main issues from the view of urban design and gives possible countermeasures for the future design. In order to make full use of the environmental resources, we should build a connection between the waterfront and the inside city, and provide more opportunities for individuals to keep closing to water.